Attachment 3__ EYNF Control Network Report.pdf

United States Department of Agriculture

United States Forest Service

Southern Region, Atlanta, GA

CADASTRAL CONTROL FOR THE

PUERTO RICO BOUNDARY RE-ESTABLISHMENT PROJECT

PROJECT REPORT FOR:

Project Name: EL YUNQUE NF

CONTROL NETWORK

NGS Tracking Number:

Agency code:

USFS

Location:

El Yunque National Forest

Municipalities: Rio Grande, Luquillo, Fajardo, Ceiba, Naguabo, Las Piedras, & Canóvanas, Puerto Rico

Report Date:

MAY 2020

Conducted For: USFS Conducted By: USFS

Adjusted By: RLDA

Contents

1. Introduction

2. Project Attributes

2.1. Agency and Purpose

2.2. Project Chronology and Field Work

3. Location

4. Project Specifications

4.1. Accuracy Standards

4.2. Planning

4.3. Fieldwork

4.4. Vector Processing

5. Conditions Affecting Progress

6. CORS

7. Instrumentation

8. Data Processing

8.1. Software Used

8.2. Vector Processing and Analysis

9. Network Adjustment

9.1. Minimally Constrained Horizontal Adjustment

9.2. Constrained Horizontal Adjustment

9.3. Free Vertical Adjustment

9.4. Constrained Vertical Adjustment

10. Comments and Recommendations

11. Supporting Documentation

12. Certification

Appendix A – Mark Observations by Session

Appendix B – OPUS Projects Preferences and Network Design

Appendix C – WINDESC

Appendix D – Published Datasheets

North-West South-East Latitude: 18°20'58.47"N 18°15'3.22"N

Longitude: 65°53'19.06"W 65°42'37.30"W

Project Limits

1. Introduction As part of the recovery from the damages caused by Hurricane Maria, specific funds were allocated to perform recovery and re-establishment of the boundaries of all the lands administered by the US Forest Service in Puerto Rico. In order to conduct the work, a geodetic control survey is needed first to establish a framework from which supplemental work will be tied. For example, a series of auxiliary baselines will be completed to support, densify, and check the optical traverses throughout the project. The control network will also serve as a forest-wide control for general geospatial work due to the permanently monumented control points intended to be incorporated into the National Spatial Reference System (NSRS), managed by the NOAA’s National Geodetic Survey (NGS). Ultimately, the network will serve the public as a reference for private surveys across the area. This survey was performed to more rigorous accuracy and quality assurance standards than those for general surveying, engineering, or topographic mapping purposes.1

Point of Contact

Randy Stoddard, PLS Lands, Minerals, & Uses Unit Southern Region – R8 1720 Peachtree Road, NW, Ste. 760S Atlanta, GA 30309-2405 Phone – 334.315.4894 Email – randolph.stoddard-ramos@usda.gov

2. Project Attributes Horizontal Datum: North American Datum of 1983 (2011) epoch 2010.00 Vertical Datum: Puerto Rico Vertical Datum 2002 (PRVD02) Geoid Model Used: GEOID18

Number of new stations: 17 stations Number of CORS stations: 6 stations were tied to this project Specific station details are provided in Section 2.2.

Latitude/Longitude of the project boundaries excluding the CORS.

1 The introductory paragraph was composed of information found in the Forest Service-Bureau of Land Management, Standard and Guidelines for CADASTRAL SURVEYS Using GPS Methods, 2001. Available at, https://www.fs.fed.us/database/gps/documents/GPS4CAD_Stds.pdf https://oceanservice.noaa.gov/facts/nsrs.html https://www.ngs.noaa.gov/ https://www.ngs.noaa.gov/datums/vertical/puerto-rico-vertical-datum-2002.shtml https://geodesy.noaa.gov/CORS/ https://www.fs.fed.us/database/gps/documents/GPS4CAD_Stds.pdf

2.1. Agency and Purpose

This survey was conducted by the US Forest Service, Southern Region, LM&U Unit (agency code, USFS) in support of the Puerto Rico Boundary Reestablishment Project.

2.2. Project Chronology and Field Work

Initial Project Request The initial project request was submitted to and approved by the National Geodetic Survey on November 14, 2019. NGS Tracking Number: 9363.

Reconnaissance and Mark-Setting Reconnaissance and Mark-setting for this project were completed by the Forest Service and federal contractors in the fall of 2019. To determine site-eligibility, Rapid-Static shots were taken for 20-45 minutes. These were later post-processed and verified.

New Marks Set for This Project

SD

NAME

EYNF 01 PORTAL

EYNF 02 YUQUIBO

EYNF 03 SABANA

EYNF 04 RIO CHIQUITO

EYNF 05 PEÑON

EYNF 06 JUAN DIEGO

EYNF 07 DUQUE

EYNF 08 MAIZALES

EYNF 09 FLORIDA

EYNF 10 RIO BLANCO

EYNF 11 FERMIN

EYNF 12 PASTO SECO

EYNF 13 MARINES

EYNF 14 CUBUY

EYNF 15 EL TORO

EYNF 16 HATO PUERCO

EYNF 17 MOROVIS

EYNF 18 GUZMAN ABAJO

EYNF 19 BELLA VISTA

EYNF 20 EL VERDE

EYNF 21 JIMENEZ

EYNF 22 EL ZARZAL

EYNF 23 SALDAÑA

EYNF 24 MIRADOR

https://www.fs.usda.gov/r8

Field Observations Observations were conducted under USFS contracts:

• 1243ZP20F0005:

RLDA & Associates 268 Peru St.

Urb. Hyde Park San Juan, PR, 00918

• 1243ZP20F0006:

Luis Berrios Montes & Associates Urb. Hacienda La Arboleda Calle Arboleda Vega Baja, PR 00693

• 1243ZP20F0005:

Agrim. Julio Soto Serrano, CSP PO Box 1592 San Sebastián, PR 00685

GNSS observations were conducted between November 20, 2019 and November 21, 2019 under the supervision of US Forest Service Land Surveyor, Randy Stoddard, PLS. The observations were collected according to the specifications detailed in section 4.3 of this report, which included a collection interval of 15 seconds, at a 10° mask angle. Additional observations on Julian Days (JD) 2020-112 were completed but not used for this survey.

Adjustment The NAD83(2011) adjustment was processed and adjusted on May 12, 2020, utilizing Beta Opus Projects. All adjustments made were analyzed for large residuals (Hz. 2cm & Vrt.

4cm) and deemed acceptable.

https://beta.ngs.noaa.gov/OPUS-Projects/ https://beta.ngs.noaa.gov/OPUS-Projects/

3. Location Around the perimeter of the main unit of El Yunque National Forest. Stations were distributed across 7 Municipalities:

Rio Grande, Luquillo, Fajardo, Ceiba, Naguabo, Las Piedras, & Canóvanas, Puerto Rico.

3.1 Initial Network Design

https://www.fs.usda.gov/elyunque

3.2 Network to be Adjusted

4. Project Specifications The following project specifications describe the instructions under which this survey was planned, observed, and processed. See Appendix B for a table captured from OPUS Projects that illustrates the sessions and number of observations associated with each mark.

4.1. Accuracy Standards2

This GNSS survey conforms to the FGCC standards for B-order GPS surveys (1:1,000,000) according to the Geometric Geodetic Accuracy Standards and Specifications for Using GPS Relative Positioning Techniques, version 5.0 with corrections, August 1, 1989, FGCC.

This geodetic network survey was performed to meet automated data recording, submittal, project review, and least-squares adjustment requirements established by the Federal Geodetic Control Subcommittee (FGCS).

The network accuracies3, expressed at two sigmas, were the result of the final constrained adjustment described in section 9.2 of this report and represent the certainty of position by a single point coordinate. It provides a means to directly compare the accuracy of coordinate values obtained in this survey with those obtained by other methods for the same point.

Designation PID NAME North

(cm) East (cm) Vertical

(cm)

EYNF 01 DR5103 PORTAL 0.004 0.005 0.015

EYNF 03 DR5104 SABANA 0.005 0.005 0.016

EYNF 04 DR5105 RIO CHIQUITO 0.004 0.004 0.012

EYNF 09 DR5106 FLORIDA 0.005 0.004 0.012

EYNF 11 DR5107 FERMIN 0.004 0.004 0.012

EYNF 12 DR5108 PASTO SECO 0.005 0.005 0.014

EYNF 13 DR5109 MARINES 0.004 0.004 0.011

EYNF 14 DR5110 CUBUY 0.004 0.004 0.011

EYNF 15 DR5111 EL TORO 0.004 0.004 0.013

EYNF 16 DR5112 HATO PUERCO 0.005 0.005 0.014

EYNF 17 DR5113 MOROVIS 0.004 0.005 0.013

EYNF 18 DR5114 GUZMAN ABAJO 0.005 0.004 0.012

EYNF 19 DR5115 BELLA VISTA 0.005 0.005 0.013

EYNF 21 DR5116 JIMENEZ 0.005 0.005 0.013

EYNF 22 DR5117 EL ZARZAL 0.004 0.004 0.012

EYNF 23 DR5118 MIRADOR 0.004 0.004 0.012

EYNF 24 DR5119 SALDAÑA 0.005 0.005 0.013

2 Information found in this section was primarily composed of statements and concepts found in the FGDC, GPA Standards Part 2: Standards for Geodetic Networks, 1998.

3 The network accuracy of a control point is a value that represents the uncertainty in the coordinates of the control point with respect to the geodetic datum at the 95-percent confidence level. For NSRS network accuracy class., the datum is considered to be the geodetic values at the CORS by NGS.

https://www.ngs.noaa.gov/PUBS_LIB/GeomGeod.pdf https://www.ngs.noaa.gov/PUBS_LIB/GeomGeod.pdf https://www.ngs.noaa.gov/PUBS_LIB/GeomGeod.pdf https://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part2/chapter2

4.2. Planning

This Cadastral Control Network Survey was carefully planned to support the subsequent boundary surveys across the perimeter of the main unit of El Yunque National Forest. These marks are to be permanent to support the forest infrastructure and the surrounding public.

4.3. Fieldwork

Monumentation New monumentation set for this project consisted of a concrete monument with a custom designed 3 ½ inch diameter domed bronze cap as defined in Attachment B section in the NGS guidelines Bench Mark Reset Procedures by Curtis Smith (2010) 4. See monument cross-section and custom bronze cap:

Observations The observation guidelines under which this survey was conducted were a combination of OPUS Projects processing requirements, and FS/BLM specifications. They included:

Equipment:

• Equipment must be well maintained and properly calibrated.

• Uniform receivers and antennas are required for all observations. That is to say, the same manufacturer and model of equipment must be used for all observations.

• Receivers must collect dual-frequency GPS(L1/L2) full-wavelength carrier observables.

• Only antennas with calibrations accepted by the National Geodetic Survey (NGS) may be used. See http://www.ngs.noaa.gov/ANTCAL/ for a list of accepted antennas.

• Fixed height tripods will be preferred. Tribrach may be used when fixed height is not practical.

4 Available at http://www.ngs.noaa.gov/PUBS_LIB/Benchmark_4_1_2011.pdf https://www.fs.fed.us/database/gps/documents/GPS4CAD_Stds.pdf http://www.ngs.noaa.gov/ANTCAL/ http://www.ngs.noaa.gov/PUBS_LIB/Benchmark_4_1_2011.pdf

Procedures:

• The antenna’s north reference point (NRP) shall be aligned oriented toward the true north direction as defined by NGS. See http://www.ngs.noaa.gov/ANTCAL/FAQ.xhtml#faq5 for additional details.

• The antenna must remain unmoved throughout the observing session.

• Only GPS observables will be processed.

• Elevation cut-off or mask angle shall not be set greater than 10°.

• Recording rates, or epochs, shall be set to 15 seconds or less.

• Data shall be collected as static observations.

• The assigned and provided station description (SD) or SSN shall be used as the station identification for any field inputs prior to the commencement of the observation.

• A record of deviations from these instructions will be maintained and submitted to the Forest Service at the conclusion of the project.

Session Parameters:

• Data will be collected in sessions. Each session will require a minimum of 4 hours of simultaneous observation (i.e., when all receivers are recording at the same time).

• One field surveyor/operator may operate only one receiver per session.

• Each station will be observed a minimum of two times. The observations associated with anyone mark should be taken on different days.

• Sessions will be scheduled so everybody can start and end at the same time.

• Field log sheets (format provided by NGS) will be required for each observation/occupation.

o NGS mark designation will be used.

o Cross out any incorrect entries and replace them with the appropriate correction as one would do with traditional survey field notations.

o Fixed height metric unit to the Antenna Reference Point (ARP) will be used as shown in this illustration from Volume I – Global Navigation Satellite System Control, Chapter 4, page 4-19, available at, http://www.ngs.noaa.gov/FGCS/BlueBook/pdf/Chapter%204%204_24_15.pdf o ARP height will be recorded in meters.

o Record comments about potential issues such as inclement weather or potential obstructions nearby.

Available resources in terms of manpower, equipment, and time may result in slight deviations regarding the session attributes. See Appendix B for a table captured from OPUS Projects that illustrates the sessions and number of observations associated with each mark.

http://www.ngs.noaa.gov/ANTCAL/FAQ.xhtml#faq5%20 http://www.ngs.noaa.gov/ANTCAL/FAQ.xhtml#faq5%20 http://www.ngs.noaa.gov/FGCS/BlueBook/pdf/Chapter%204%204_24_15.pdf

4.4. Vector Processing

BETA OPUS Projects was used as the baseline processor for this project. The following guidelines and recommendations for processing provided by the National Geodetic Survey’s Regional Advisor for the Mid Atlantic; Scott Lokken, were applied to this survey.

Network Design

• Session networks included both short (CORS within 100km) and long (IGS exceeding 500km) baseline lengths

• Baselines were defined by selecting one CORS station (PRLP) per session as a hub

• Each rover4 connected directly to the hub station

• All hub stations were present in all project sessions where data was available

• No distances to hub stations exceeded 100km

• Multiple hubs were selected to remove single hub bias

Preferences, Constraints, and Tropospheric Modeling

• See Appendix B for a copy of the OPUS Projects Preference settings

• Precise ephemeris was used in processing

• The normal constraints option was selected

• User was selected as the Network Design

• Piece-wise Linear was selected as the Tropo Model option with a Tropo Interval of

7200 seconds

• Elevation cutoff, 15 degrees

4 In this report, rover is defined as an autonomous receiver used to observe a passive mark https://geodesy.noaa.gov/ADVISORS/#MA mailto:Scott.Lokken@noaa.gov

5. Conditions Affecting Progress Weather The weather was considered favorable for the observations. No major concerns regarding the weather conditions.

Instrumentation Failures No instrument failures were reported.

Deviations from Instructions There were no reported deviations from instructions.

6. CORS

Six Continuously Operating Reference Station (CORS) were included in the project.

SSA Designation

ZMA1 MIAMI WAAS 1

ZSU4 SAN JUAN WAAS 4

PRHL BAYAMON

PRFJ FAJARDO

PRLP LAS PIEDRAS

STVI ST THOMAS

IGS CORS ZMA1 located in Miami, Florida was included in every session for proper tropospheric modeling. Also, ZMA1 was selected as the distant CORS because other available CORS < 800km did not have NAD83 coordinates

CORS data were automatically referenced in OPUS Projects. Copies of the CORS data were not included with this submittal. Published accuracies were available for ZMA1 although the station was not constrained in this project. Short-term accuracies were used for all other CORS.

https://geodesy.noaa.gov/CORS/ https://www.ngs.noaa.gov/CORS/Sites/zma1.html https://www.ngs.noaa.gov/CORS/Sites/zsu4.html https://beta.ngs.noaa.gov/CORS/Sites/prhl.html https://beta.ngs.noaa.gov/CORS/Sites/prfj.html https://beta.ngs.noaa.gov/CORS/Sites/prlp.html https://beta.ngs.noaa.gov/CORS/Sites/stvi.html

7. Instrumentation Passive mark instrumentation used on this job:

SD

Manufacturer

Integrated Receiver/Antenn a Model Type

NGS Antenna Model

Designation

Serial

Number

Firmware Version

EYNF 01 LEICA GS14 LEIGS14 290421 5.70

EYNF 02 TRIMBLE R10-2 TRMR10-2 5823470320 5.42

EYNF 03 TRIMBLE R10-2 TRMR10-2 49F00260 5.44

EYNF 04 LEICA GS14 LEIGS14 2810380 5.70

EYNF 05 TRIMBLE R8 TRMR8_GNSS 4950409732 4.93

EYNF 06 TRIMBLE R8S TRMR8S 5916R91020 5.41

EYNF 07 TRIMBLE R10 TRMR10 5546442364 5.14

EYNF 08 TRIMBLE R10 TRMR10 5729470086 5.44

EYNF 09 TRIMBLE R8S TRMR8S 5921R91056 5.41

EYNF 10 TRIMBLE R8S TRMR8S 5919R91111 5.41

EYNF 11 TRIMBLE R6 TRMR6 4732136913 3.82

EYNF 12 TRIMBLE R6-4 TRMR6-4 5306425526 4.71

EYNF 13 TRIMBLE R6 TRMR6 4849160899 3.64

EYNF 14 TRIMBLE R6 TRMR6 4847160786 3.64

EYNF 15 TRIMBLE R6 TRMR6 4729135564 4.19

EYNF 16 TRIMBLE R6 TRMR6 4729135824 4.64

EYNF 17 TRIMBLE R8S TRMR8S 5919R91242 5.41

EYNF 18 TRIMBLE R8S TRMR8S 5918R91114 5.41

EYNF 19 TRIMBLE R8 TRMR8_GNSS 4625117652 4.64

EYNF 21 TRIMBLE R8 TRMR8_GNSS 4624117139 4.64

EYNF 22 TRIMBLE R4-3 TRMR4-3 5509494498 5.15

EYNF 23 TRIMBLE R10 TRMR10 5824470273 5.42

EYNF 24 TRIMBLE R10 TRMR10 5245415007 5.20

CORS instrumentation used on this job:

CORS

SSA

Manufacturer

Type

Serial Number

R ec ei ve r I nf o

ZMA1 NOV WAASGII 79C1

ZSU4 NOV WAASGII 80C1

PRHL Trimble NETR5 4621K01388 PRFJ Trimble NETR9 5225K50272 PRLP Trimble NETR5 4740K10765 STVI Trimble NETR9 5310K42334

An te nn a

In fo

ZMA1 NOV WAAS_600 NONE

ZSU4 MPL WAAS_2225NW NONE NONE

PRHL Trimble TRM55971.00 NONE 5000116352 PRFJ Trimble TRM57971.00 NONE 2642117206 PRLP Trimble TRM57971.00 NONE 30520301 STVI Trimble TRM29659.00 SCITE 4724A34323

8. Data Processing GNSS data was collected directly to the receivers. The files were downloaded and transferred using multiple devices and techniques before ultimately uploading to OPUS Projects.

8.1. Software Used

Vector processing was completed using BETA OPUS Projects solution software page5 (908.29). The adjustment was completed using NGS Adjust Suite software version 6.4.2.

8.2. Vector Processing and Analysis

All observations were uploaded to OPUS Projects through OPUS Static. BETA OPUS Projects automatically grouped the data into sessions based on simultaneous occupation time. The OPUS Projects sessions matched the observed sessions as reported. See the session schedule in the SUPPLEMENT folder on file at the Region 8, Lands digital records:

7150Surveying\7150_PR\7150_ElYunque\EYNF_Control_Network2020

The independent solutions were reviewed to identify the best possible CORS hubs for each session. This information was compared against the processing requirement that the local CORS be within 100km of the project mark. That analysis resulted in the selection of five local CORS which were used to process the project.

The single most prevalent CORS (PRLP) in each session was selected as an initial hub.

This resulted in a preliminary G file which was used in a preliminary adjustment to identify poorly fitting vectors by examining the vector residuals. The sessions with individual marks having high residuals were reprocessed in OPUS Projects using a different hub. Those marks were then reviewed individually using the BETA OPUS Projects, Processing Results Plots to identify the best fitting solutions in the northing, easting, and upping components. A guideline for allowable variation in northing and easting was approximately 0.02m horizontally and in the upping approximately 0.04m vertically. Outlying solutions were excluded for the final G file.

JD 324 and 325 revealed large residuals on stations 2, 5, 6, 7, 8, & 10. Reobservations on JD 112 were added for stations 2, 5, 6, 7, 10. (8 was not re-observed). JD 112 resulted problematic for these reasons:

1. December and January earthquakes produced new coordinates on four PR CORS.

(not used in this project.)

2. Three of the previously used CORSs were unavailable, (PRHL, PRLP and PRFJ.)

This required a new hub. All sessions were reprocessed, using ZSU4 as a hub and adding additional control in the USVI.

3. Subsequent adjustments including JD 112 did not identify problematic observations.

It was decided that further reobservations would likely be difficult on these stations and chose to remove them from the project. The discarded stations will be submitted via OPUS Share. All data remains in the project but only JD 324 and 325 are included in the vector processing. All processing and adjustments were removed at this time. Sessions JD 325 and 325 were reprocessed with acceptable results using the original CORSs and PRLP as the hub (2,5,6,7,8 and 10 were not included).

9. Network Adjustment

9.1. Minimally Constrained Horizontal Adjustment

PRLP was constrained in all three dimensions. The NEU Sigma factors were 0.13cm North, 0.08cm East and 0.13cm vertically. These NEU factors are typical of adjustments processed using OPUS Projects. For that reason, the NEU sigma factors were accepted.

The NGS BETA OPUS-Projects 1.52 NETWORK ADJUSTMENT REPORT was run and analyzed for residuals exceeding the recommend guidelines of 0.03m horizontally and 0.04m vertically. There were no issues.

A coordinate comparison was computed to evaluate the differences between published control and the positions computed in the free adjustment. The results were shown in the table below (units in meters).

In this adjustment phase, the stations 2, 5, 6, 7, 8, & 10 had good residuals, but the accuracies were out of the tolerance for NGS Bluebooking purposes.

DIFFERENCES

SSN Designation North (CM) East (CM) Vertical (CM) PRFJ Fajardo CORS ARP 0.005 -0.003 0.000

PRHL Bayamon CORS 0.012 -0.001 -0.004

PRLP Las Piedras CORS ARP 0.005 -0.002 -0.001

STVI ST THOMAS CORS ARP 0.009 0.000 -0.012

ZMA1 MIAMI WAAS 1 CORS ARP 0.008 -0.005 -0.013

ZSU4 SAN JUAN WAAS 4 CORS ARP 0.009 -0.001 -0.023

https://www.ngs.noaa.gov/FGCS/BlueBook/

9.2. Constrained Horizontal Adjustment

The sigma scale factors from the free adjustment B file were applied to the constraining A file’s VS record. All published coordinates were constrained as shown:

SD Designation Latitude Longitude Ellip HGT PRFJ Fajardo CORS ARP 18 19 34.73672 065 39 05.00878 -20.77 PRHL Bayamon CORS 18 22 48.09114 066 09 12.81218 -22.545 PRLP Las Piedras CORS ARP 18 11 41.62782 065 52 05.75073 58.877

STVI ST THOMAS CORS ARP 18 20 24.32666 064 58 28.01364 -19.594

ZSU4 SAN JUAN WAAS 4 CORS ARP 18 25 52.79262 065 59 36.52001 -26.663

New Sites Positions After Horizontal Adjustment

SD Designation Latitude Longitude Ellip HGT

EYNF 01 PORTAL 18 20 21.75790 065 45 36.50742 134.869

EYNF 03 SABANA 18 19 30.55348 065 43 48.21593 58.050

EYNF 04 RIO CHIQUITO 18 19 12.39473 065 42 35.15531 215.591

EYNF 09 FLORIDA 18 14 36.92352 065 46 44.55989 115.650

EYNF 11 FERMIN 18 14 27.33750 065 49 09.07658 447.824

EYNF 12 PASTO SECO 18 14 49.98324 065 49 46.88455 320.257

EYNF 13 MARINES 18 15 28.97521 065 50 45.34465 521.993

EYNF 14 CUBUY 18 15 26.57566 065 51 43.10952 480.489

EYNF 15 EL TORO 18 16 52.24585 065 51 29.26251 596.090

EYNF 16 HATO PUERCO 18 17 27.04199 065 51 12.42016 558.245

EYNF 17 MOROVIS 18 18 44.02259 065 49 45.64169 444.695

EYNF 18 GUZMAN ABAJO 18 19 37.78470 065 50 12.82083 251.471

EYNF 19 BELLA VISTA 18 20 26.93239 065 50 00.27989 125.650

EYNF 21 JIMENEZ 18 20 08.62947 065 47 47.79456 195.562

EYNF 22 EL ZARZAL 18 20 51.18730 065 47 18.38795 240.090

EYNF 23 SALDAÑA 18 19 11.02575 065 46 09.27263 415.654

EYNF 24 MIRADOR 18 19 20.61270 065 45 53.87024 340.639

9.3. Free Vertical Adjustment

Because no observation was made in any Published Vertical Control, the vertical height will be published as Ellipsoidal height. If Orthometric height is needed ‘H’, it can be obtained by differencing the ellipsoidal height ‘h’ from the geoid height ‘N’.

9.4. Constrained Vertical Adjustment

Since this control network adjustment is focused on the horizontal accuracy, there were no concerns with this adjustment. Both vertical adjustments were completed to satisfy OPUS Projects submission requirements.

10. Comments and Recommendations

This project had originally 24 passive marks from whom 17 are going through the “Blue Book” process and are depicted throughout this report. The rest of the stations will be published through OPUS Share. These stations (EYNF 02, EYNF 05, EYNF06, EYNF 07, EYNF 08 & EYNF 10) had 12 hours of occupation since they were part of the original Observation Schedule and NGS project request. For mark EYNF 20 (EL VERDE), the location was deemed unfavorable and it will need to be relocated. This latter mark was not included in this project report and/or adjustment.

11. Supporting Documentation

The following information can be found in the SUBMITTED documentation.

• Station descriptions – EY.des

• Observing Schedule and Field Logs – EYNF_FieldLogsObsSched.pdf

• Observation Photos - EYNF_CN_Photos.pdf

• OPUS Share solutions for non-adjusted marks – OpusShare_2567810_SOLUTIONS.pdf

12. Certification I hereby certify that this report was prepared by me and that all information acquired has been verified and to the greatest extent inaccuracies have been omitted by thorough analysis as well as proper research.

Signature:

Randy Stoddard, PLS Land Surveyor

Date: May 26th, 2020

H = h – N https://geodesy.noaa.gov/OPUS/view.jsp https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV39&ts=20135171321 https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV43&ts=20141144150 https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV44&ts=20141144319 https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV45&ts=20141144331 https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV46&ts=20141144343 https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV47&ts=20141144404

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

EY

N

F

2019-324 X X X X X X X X X X X X X X X X X X X X X X X

2019-325 X X X X X X X X X X X X X X X X X X X X X X X

2020-112 X X X X X X

Station Designation (SD)

Se ss io n

Appendix A – Mark Observations by Session

Stations were identified by their assigned SD and listed across the top of each table. The tables contain twenty stations each, increasing in numeric order left to right. In addition, each table lists every Julian day/Session along the left-hand column increasing from top to bottom.

An “X” indicates an observation of a mark. By intersecting the Julian day in the row with an “X” with the SD in the column one can easily identify when a mark was observed and by tallying the “X” values in a particular column one can identify how many observations of a mark were taken.

Appendix B – OPUS Projects Preferences and Network Design

B.1 Session 2019-324-A

B.2 Session 2019-325-A

B.3 ALL SESSIONS SOLUTION STATICS

Appendix C – WINDESC

All CORS stations were removed from the WINDESC files. WINDESC version 5.03 was used.

The following data checks were run:

Photos Photos are being submitted for every mark. They have been checked and verified as being a correct representation of the marks observed. They are Forest Service’s most current photos available and are being submitted to support the mark description process. They may be useful in verifying disk stampings, setting information, or similar attributes that can be confirmed visually. They are not, nor intended to be, a record of occupation.

Spell check all descriptions Spell check was run on all descriptions. Corrections were applied where necessary.

Error file The error file was evaluated. All errors were corrected. The remaining warnings were determined to be acceptable.

https://www.ngs.noaa.gov/PC_PROD/pc_prod.shtml#WinDesc

1 National Geodetic Survey, Retrieval Date = JUNE 5, 2020

DR5103 ***********************************************************************

DR5103 DESIGNATION - EYNF 01

DR5103 PID - DR5103

DR5103 STATE/COUNTY- PR/RIO GRANDE

DR5103 COUNTRY - US

DR5103 USGS QUAD - EL YUNQUE (2018)

DR5103

DR5103 *CURRENT SURVEY CONTROL

DR5103 ______________________________________________________________________

DR5103* NAD 83(2011) POSITION- 18 20 21.75790(N) 065 45 36.50742(W) ADJUSTED

DR5103* NAD 83(2011) ELLIP HT- 134.869 (meters) (05/12/20) ADJUSTED

DR5103* NAD 83(2011) EPOCH - 2010.00

DR5103 ______________________________________________________________________

DR5103 GEOID HEIGHT - -41.088 (meters) GEOID18 DR5103 NAD 83(2011) X - 2,486,468.735 (meters) COMP DR5103 NAD 83(2011) Y - -5,522,365.791 (meters) COMP DR5103 NAD 83(2011) Z - 1,994,116.917 (meters) COMP DR5103 LAPLACE CORR - -2.86 (seconds) DEFLEC18

DR5103

DR5103 Network accuracy estimates per FGDC Geospatial Positioning Accuracy DR5103 Standards:

DR5103 FGDC (95% conf, cm) Standard deviation (cm) CorrNE DR5103 Horiz Ellip SD_N SD_E SD_h (unitless)

DR5103 -------------------------------------------------------------------

DR5103 NETWORK 1.12 2.94 0.44 0.47 1.50 -0.14187550

DR5103 -------------------------------------------------------------------

DR5103 Click here for local accuracies and other accuracy information.

DR5103

DR5103

DR5103.The horizontal coordinates were established by GPS observations DR5103.and adjusted by the RLDA SURVEYING AND MAPPING in May 2020.

DR5103

DR5103.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has DR5103.been affixed to the stable North American tectonic plate. See DR5103.NA2011 for more information.

DR5103

DR5103.The horizontal coordinates are valid at the epoch date displayed above DR5103.which is a decimal equivalence of Year/Month/Day.

DR5103

DR5103.Significant digits in the geoid height do not necessarily reflect accuracy.

DR5103.GEOID18 height accuracy estimate available here.

DR5103

DR5103.Click photographs - Photos may exist for this station.

DR5103

DR5103.The X, Y, and Z were computed from the position and the ellipsoidal ht.

DR5103

DR5103.The Laplace correction was computed from DEFLEC18 derived deflections.

DR5103

DR5103.The ellipsoidal height was determined by GPS observations DR5103.and is referenced to NAD 83.

DR5103

DR5103. The following values were computed from the NAD 83(2011) position.

DR5103

DR5103; North East Units Scale Factor Converg.

DR5103;SPC PRVI - 256,140.453 271,156.332 MT 0.99999565 +0 12 38.3

DR5103;UTM 20 - 2,029,945.696 208,277.180 MT 1.00065224 -0 52 08.7

DR5103

DR5103! - Elev Factor x Scale Factor = Combined Factor DR5103!SPC PRVI - 0.99997880 x 0.99999565 = 0.99997445 DR5103!UTM 20 - 0.99997880 x 1.00065224 = 1.00063102

DR5103

DR5103_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QKF0827729945(NAD 83)

DR5103

DR5103 SUPERSEDED SURVEY CONTROL

DR5103

DR5103.No superseded survey control is available for this station.

DR5103

DR5103_MARKER: DD = SURVEY DISK

DR5103_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT

DR5103_STAMPING: EYNF 01 PORTAL 2019

DR5103_MARK LOGO: USFS

DR5103_PROJECTION: FLUSH

DR5103_MAGNETIC: B = BAR MAGNET IMBEDDED IN MONUMENT

DR5103_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO

DR5103+STABILITY: SURFACE MOTION

DR5103_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR

DR5103+SATELLITE: SATELLITE OBSERVATIONS - November 01, 2019

DR5103

DR5103 HISTORY - Date Condition Report By

DR5103 HISTORY - 20191101 MONUMENTED RLDA

DR5103

DR5103 STATION DESCRIPTION

DR5103

DR5103'DESCRIBED BY RLDA SURVEYING AND MAPPING 2019

DR5103'TO REACH THE STATION FROM THE CITY OF SAN JUAN, TAKE BALDORIOTY DE

DR5103'CASTRO AVENUE (PR-26) UNTIL YOU REACH THE INTERSECTION OF ROUTE 66

DR5103'(PR-66). GO EAST ON ROUTE 66 (PR-66) UNTIL YOU REACH THE INTERSECTION

DR5103'OF ROUTE 3 (PR-3), THEN CONTINUE EAST ON ROUTE 3 (PR-3) UNTIL YOU

DR5103'REACH KILOMETER MARKER 31.8 LOCATED IN THE CITY OF RIO GRANDE. THEN

DR5103'TURN RIGHT ON ROUTE 955 (PR-955) AND TRAVEL FOR 0.25 MI (0.40 KM)

DR5103'UNTIL YOU REACH THE INTERSECTION OF ROUTE 191 (PR-191) TURN LEFT ON

DR5103'ROUTE 191 (PR-191) AND GO FOR 2.6 MI (4.2 KM) TO KILOMETER MARKER 4.2,

DR5103'AT THE EL YUNQUE FOREST PORTAL ENTRANCE. THE STATION CAN BE LOCATED

DR5103'IN THE CENTRAL GREEN AREA OF THE EL YUNQUE PORTAL ENTRANCE EMBEDDED IN

DR5103'CONCRETE.

DR5103'

DR5103'THE STATION IS LOCATED 7.97 M (26.1 FT) SOUTH-WEST FROM A CATCH BASIN,

DR5103'2.60 M (8.5 FT) NORTH-WEST FORM THE ROAD BACK OF CURB AND 8.28 M (27.2

DR5103'FT) NORTH-EAST FROM A CATCH BASIN.

DR5103'

DR5103'THE MONUMENT IS A U.S. DEPARTMENT OF AGRICULTURE FOREST SERVICE BRASS

DR5103'DISK EMBEDDED IN CONCRETE.

Shared Solution

PID: BBGV39

Designation: EYNF 02 YUQUIBO

Stamping: EYNF 02 YUQUIBO 2019 Stability:

Setting: Set in top of concrete monument Description: THE STATION IS LOCATED 1.22 M (4.0 FT) NORTH OF THE

EDGE OF PAVEMENT, 16.15 M (53.0 FT) NORTH FROM

KILOMETER MARKER 4.6, AND 32.41 M (106.33 FT) EAST

OF THE CENTER COLUMN BELONGING TO THE

CONCRETE FENCE AT THE ENTRANCE.

Observed: 2019-11-20T12:47:00Z Source: OPUS - page5 1801.18

Close-up View

REF_FRAME: NAD_83(2011) EPOCH: 2010.0000 SOURCE: H = h-N (N = GEOID18 HGT) UNITS: m SET PROFILE DETAILS

LAT: 18° 19' 22.46462" ± 0.007 m LON: -65° 44' 33.61038" ± 0.016 m

ELL HT: 172.727 ± 0.023 m X: 2488402.896 ± 0.012 m Y: -5522162.834 ± 0.029 m Z: 1992398.283 ± 0.005 m

ORTHO HT: 213.686 ± 0.080 m

UTM 20 SPC 5200(PRVI)

NORTHING: 2028093.790m 254324.344m

EASTING: 210097.417m 273009.924m

CONVERGENCE: -0.86282222° 0.21610000°

POINT SCALE: 1.00063915 0.99999516

COMBINED FACTOR: 1.00061198 0.99996801

CONTRIBUTED BY

hsanabria HLCM GROUp

Horizon View

The numerical values for this position solution have satisfied the quality control criteria of the National Geodetic Survey. The contributor has verified that the information submitted is accurate and complete.

EYNF 02 YUQUIBO

Get directions: To here (nearest road)

Map data ©2020Report a map error

Page 1 of 1Shared Solution

5/21/2020https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV39&ts=20135171321

DR5104 ***********************************************************************

DR5104 DESIGNATION - EYNF 03

DR5104 PID - DR5104

DR5104 STATE/COUNTY- PR/LUQUILLO

DR5104 COUNTRY - US

DR5104 USGS QUAD - FAJARDO (2018)

DR5104

DR5104 *CURRENT SURVEY CONTROL

DR5104 ______________________________________________________________________

DR5104* NAD 83(2011) POSITION- 18 19 30.55348(N) 065 43 48.21593(W) ADJUSTED

DR5104* NAD 83(2011) ELLIP HT- 58.050 (meters) (05/12/20) ADJUSTED

DR5104* NAD 83(2011) EPOCH - 2010.00

DR5104 ______________________________________________________________________

DR5104 GEOID HEIGHT - -41.038 (meters) GEOID18 DR5104 NAD 83(2011) X - 2,489,541.260 (meters) COMP DR5104 NAD 83(2011) Y - -5,521,444.536 (meters) COMP DR5104 NAD 83(2011) Z - 1,992,598.320 (meters) COMP DR5104 LAPLACE CORR - -2.60 (seconds) DEFLEC18

DR5104

DR5104 Network accuracy estimates per FGDC Geospatial Positioning Accuracy DR5104 Standards:

DR5104 FGDC (95% conf, cm) Standard deviation (cm) CorrNE DR5104 Horiz Ellip SD_N SD_E SD_h (unitless)

DR5104 -------------------------------------------------------------------

DR5104 NETWORK 1.21 3.18 0.48 0.51 1.62 -0.02813140

DR5104 -------------------------------------------------------------------

DR5104 Click here for local accuracies and other accuracy information.

DR5104

DR5104

DR5104.The horizontal coordinates were established by GPS observations DR5104.and adjusted by the RLDA SURVEYING AND MAPPING in May 2020.

DR5104

DR5104.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has DR5104.been affixed to the stable North American tectonic plate. See DR5104.NA2011 for more information.

DR5104

DR5104.The horizontal coordinates are valid at the epoch date displayed above DR5104.which is a decimal equivalence of Year/Month/Day.

DR5104

DR5104.Significant digits in the geoid height do not necessarily reflect accuracy.

DR5104.GEOID18 height accuracy estimate available here.

DR5104

DR5104.Click photographs - Photos may exist for this station.

DR5104

DR5104.The X, Y, and Z were computed from the position and the ellipsoidal ht.

DR5104

DR5104.The Laplace correction was computed from DEFLEC18 derived deflections.

DR5104

DR5104.The ellipsoidal height was determined by GPS observations DR5104.and is referenced to NAD 83.

DR5104

DR5104. The following values were computed from the NAD 83(2011) position.

DR5104

DR5104; North East Units Scale Factor Converg.

DR5104;SPC PRVI - 254,578.111 274,341.917 MT 0.99999522 +0 13 12.2

DR5104;UTM 20 - 2,028,322.576 211,434.807 MT 1.00062958 -0 51 32.2

DR5104

DR5104! - Elev Factor x Scale Factor = Combined Factor DR5104!SPC PRVI - 0.99999087 x 0.99999522 = 0.99998609 DR5104!UTM 20 - 0.99999087 x 1.00062958 = 1.00062045

DR5104

DR5104_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QKF1143428322(NAD 83)

DR5104

DR5104 SUPERSEDED SURVEY CONTROL

DR5104

DR5104.No superseded survey control is available for this station.

DR5104

DR5104_MARKER: DD = SURVEY DISK

DR5104_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT

DR5104_STAMPING: EYNF 03 SABANA 2019

DR5104_MARK LOGO: USFS

DR5104_PROJECTION: FLUSH

DR5104_MAGNETIC: B = BAR MAGNET IMBEDDED IN MONUMENT

DR5104_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO

DR5104+STABILITY: SURFACE MOTION

DR5104_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR

DR5104+SATELLITE: SATELLITE OBSERVATIONS - November 01, 2019

DR5104

DR5104 HISTORY - Date Condition Report By

DR5104 HISTORY - 20191101 MONUMENTED RLDA

DR5104

DR5104 STATION DESCRIPTION

DR5104

DR5104'DESCRIBED BY RLDA SURVEYING AND MAPPING 2019

DR5104'TO REACH THE STATION FROM THE CITY OF SAN JUAN, TAKE BALDORIOTY DE

DR5104'CASTRO AVENUE (PR-26) UNTIL YOU REACH THE INTERSECTION OF ROUTE 66

DR5104'(PR-66). GO EAST ON ROUTE 66 (PR-66) UNTIL YOU REACH THE INTERSECTION

DR5104'OF ROUTE 3 (PR-3), THEN CONTINUE EAST ON ROUTE 3 (PR-3) UNTIL YOU

DR5104'REACH KILOMETER MARKER 31.8 LOCATED IN THE CITY OF RIO GRANDE. THEN

DR5104'TURN RIGHT ON ROUTE 955 (PR-955) AND TRAVEL FOR 0.25 MI (0.40 KM)

DR5104'UNTIL YOU REACH THE INTERSECTION OF ROUTE 191 (PR-191) TURN LEFT ON

DR5104'ROUTE 191 (PR-191) AND TRAVEL FOR 2.7 MI (4.3 KM) THEN TURN LEFT ON

DR5104'ROUTE 988 (PR-988) AND TRAVEL FOR 3.9 MI (6.3 KM) TO THE ENTRANCE OF

DR5104'THE SABANA FIELD RESEARCH STATION.

DR5104'

DR5104'THE STATION IS LOCATED WEST OF THE PEDESTRIAN WALKWAY ENTRANCE AND

DR5104'1.62 M (5.3 FT) NORTH-WEST OF THE PEDESTRIAN GATE, 16.15 M (53.0 FT)

DR5104'SOUTH-EAST OF THE EL YUNQUE NATIONAL FOREST STONE SIGN AND 15.24 M

DR5104'(50.0 FT) SOUTH-EAST OF THE SOUTH-WEST CORNER OF THE FIELD OFFICE

DR5104'BUILDING.

DR5104'

DR5104'THE MONUMENT IS A U.S. DEPARTMENT OF AGRICULTURE FOREST SERVICE BRASS

DR5104'DISK EMBEDDED IN CONCRETE.

DR5105 ***********************************************************************

DR5105 DESIGNATION - EYNF 04

DR5105 PID - DR5105

DR5105 STATE/COUNTY- PR/LUQUILLO

DR5105 COUNTRY - US

DR5105 USGS QUAD - FAJARDO (2018)

DR5105

DR5105 *CURRENT SURVEY CONTROL

DR5105 ______________________________________________________________________

DR5105* NAD 83(2011) POSITION- 18 19 12.39473(N) 065 42 35.15531(W) ADJUSTED

DR5105* NAD 83(2011) ELLIP HT- 215.591 (meters) (05/12/20) ADJUSTED

DR5105* NAD 83(2011) EPOCH - 2010.00

DR5105 ______________________________________________________________________

DR5105 GEOID HEIGHT - -41.066 (meters) GEOID18 DR5105 NAD 83(2011) X - 2,491,630.564 (meters) COMP DR5105 NAD 83(2011) Y - -5,520,858.667 (meters) COMP DR5105 NAD 83(2011) Z - 1,992,117.838 (meters) COMP DR5105 LAPLACE CORR - -2.80 (seconds) DEFLEC18

DR5105

DR5105 Network accuracy estimates per FGDC Geospatial Positioning Accuracy DR5105 Standards:

DR5105 FGDC (95% conf, cm) Standard deviation (cm) CorrNE DR5105 Horiz Ellip SD_N SD_E SD_h (unitless)

DR5105 -------------------------------------------------------------------

DR5105 NETWORK 1.04 2.37 0.43 0.42 1.21 -0.02467630

DR5105 -------------------------------------------------------------------

DR5105 Click here for local accuracies and other accuracy information.

DR5105

DR5105

DR5105.The horizontal coordinates were established by GPS observations DR5105.and adjusted by the RLDA SURVEYING AND MAPPING in May 2020.

DR5105

DR5105.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has DR5105.been affixed to the stable North American tectonic plate. See DR5105.NA2011 for more information.

DR5105

DR5105.The horizontal coordinates are valid at the epoch date displayed above DR5105.which is a decimal equivalence of Year/Month/Day.

DR5105

DR5105.Significant digits in the geoid height do not necessarily reflect accuracy.

DR5105.GEOID18 height accuracy estimate available here.

DR5105

DR5105.Click photographs - Photos may exist for this station.

DR5105

DR5105.The X, Y, and Z were computed from the position and the ellipsoidal ht.

DR5105

DR5105.The Laplace correction was computed from DEFLEC18 derived deflections.

DR5105

DR5105.The ellipsoidal height was determined by GPS observations DR5105.and is referenced to NAD 83.

DR5105

DR5105. The following values were computed from the NAD 83(2011) position.

DR5105

DR5105; North East Units Scale Factor Converg.

DR5105;SPC PRVI - 254,028.174 276,489.424 MT 0.99999508 +0 13 35.0

DR5105;UTM 20 - 2,027,731.933 213,572.918 MT 1.00061438 -0 51 08.4

DR5105

DR5105! - Elev Factor x Scale Factor = Combined Factor DR5105!SPC PRVI - 0.99996611 x 0.99999508 = 0.99996119 DR5105!UTM 20 - 0.99996611 x 1.00061438 = 1.00058047

DR5105

DR5105_U.S. NATIONAL GRID SPATIAL ADDRESS: 20QKF1357227731(NAD 83)

DR5105

DR5105 SUPERSEDED SURVEY CONTROL

DR5105

DR5105.No superseded survey control is available for this station.

DR5105

DR5105_MARKER: DD = SURVEY DISK

DR5105_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT

DR5105_STAMPING: EYNF 04 RIO CHIQUITO 2019

DR5105_MARK LOGO: USFS

DR5105_PROJECTION: FLUSH

DR5105_MAGNETIC: B = BAR MAGNET IMBEDDED IN MONUMENT

DR5105_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO

DR5105+STABILITY: SURFACE MOTION

DR5105_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR

DR5105+SATELLITE: SATELLITE OBSERVATIONS - November 01, 2019

DR5105

DR5105 HISTORY - Date Condition Report By

DR5105 HISTORY - 20191101 MONUMENTED RLDA

DR5105

DR5105 STATION DESCRIPTION

DR5105

DR5105'DESCRIBED BY RLDA SURVEYING AND MAPPING 2019 (JOE)

DR5105'TO REACH THE STATION FROM THE CITY OF SAN JUAN, TAKE BALDORIOTY DE

DR5105'CASTRO AVENUE (PR-26) UNTIL YOU REACH THE INTERSECTION OF ROUTE 66

DR5105'(PR-66). GO EAST ON ROUTE 66 (PR-66) UNTIL YOU REACH THE INTERSECTION

DR5105'OF ROUTE 3 (PR-3), THEN CONTINUE EAST ON ROUTE 3 (PR-3) UNTIL YOU

DR5105'REACH KILOMETER MARKER 31.8 LOCATED IN THE CITY OF RIO GRANDE. THEN

DR5105'TURN RIGHT ON ROUTE 955 (PR-955) AND TRAVEL FOR 0.25 MI (0.40 KM)

DR5105'UNTIL YOU REACH THE INTERSECTION OF ROUTE 191 (PR-191) TURN LEFT ON

DR5105'ROUTE 191 (PR-191) AND TRAVEL FOR 2.7 MI (4.3 KM) AND THEN TURN LEFT

DR5105'ON ROUTE 988 (PR-988) THEN TRAVEL FOR 6.1 MI (9.8 KM) TO THE

DR5105'INTERSECTION WITH ROUTE 9989 (PR-9989). TURN RIGHT AND TRAVEL FOR 0.8

DR5105'MI (1.3 KM) TO AN INTERSECTION, THEN TURN LEFT AT THE INTERSECTION AND

DR5105'GO FOR 0.1 MI (0.2 KM) TO THE TOP OF THE ASPHALT ROAD.

DR5105'

DR5105'THE STATION IS LOCATED AT THE WEST OF THE MRS. ZAIDA NOGERA'S CONCRETE

DR5105'HOUSE ENTRANCE, 5.12 M (16.8 FT) SOUTH-WEST OF THE EAST GATE ENTRANCE,

DR5105'5.70 M (18.7 FT) SOUTH-WEST OF A WATER METER AND 1.63 M (5.3 FT)

DR5105'OUTH-EAST OF THE WEST-SOUTH FENCE CONCRETE CORNER.

DR5105'

DR5105'THE MONUMENT IS A U.S. DEPARTMENT OF AGRICULTURE FOREST SERVICE BRASS

DR5105'DISK EMBEDDED IN CONCRETE.

PID: BBGV43

Designation: EYNF 05 PENON

Stamping: EYNF 05 PENON 2019 Stability: May hold, commonly subject to ground movement

Setting: Set in top of concrete monument Description: THE STATION IS LOCATED 1.22 M (4.0 FT) NORTH OF THE

EDGE OF PAVEMENT, 16.15 M

(53.0 FT) NORTH FROM KILOMETER MARKER 4.6 AND

32.41-METERS EAST OF THE CENTER

COLUMN BELONGING TO THE CONCRETE FENCE AT THE

ENTRANCE.

THE MONUMENT IS A U.S. DEPARTMENT OF

AGRICULTURE FOREST SERVICE BRASS DISK

THE STATION IS 7.62 M (25.0 FT) SOUTH OF A WOODEN

TELEPHONE POLE, 7.08 M

(23.2 FT) SOUTH-WEST OF A WOODEN POWER POLE AND

17.50 M (57.4 FT) NORTH-WEST

OF A COCONUT PALM TREE.

THE MONUMENT IS A U.S. DEPARTMENT

Observed: 2019-11-20T12:13:00Z

Source: OPUS - page5 1801.18

Close-up View

REF_FRAME: NAD_83(2011) EPOCH: 2010.0000 SOURCE: H = h-N (N = GEOID18 HGT) UNITS: m SET PROFILE DETAILS

LAT: 18° 18' 5.95231" ± 0.002 m LON: -65° 42' 33.78096" ± 0.011 m

ELL HT: 168.473 ± 0.006 m X: 2491912.968 ± 0.010 m Y: -5521386.288 ± 0.005 m Z: 1990163.603 ± 0.004 m

ORTHO HT: 209.392 ± 0.070 m

UTM 20 SPC 5200(PRVI)

NORTHING: 2025687.495m 251985.552m

EASTING: 213582.908m 276537.857m

CONVERGENCE: -0.85138333° 0.22651667°

POINT SCALE: 1.00061431 0.99999465

COMBINED FACTOR: 1.00058781 0.99996817

CONTRIBUTED BY

hsanabria HLCM GROUp

Horizon View

The numerical values for this position solution have satisfied the quality control criteria of the National Geodetic Survey. The contributor has verified that the information submitted is accurate and complete.

EYNF 05 PENON

Get directions: To here (nearest road)

Map data ©2020Report a map error

5/21/2020https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV43&ts=20141144150

PID: BBGV44

Designation: EYNF06 JUAN DIEGO

Stamping: EYNF06 JUAN DIEGO 2019 Stability: May hold, commonly subject to ground movement

Setting: Set in top of concrete monument Description: THE STATION IS LOCATED EAST OF THE ROAD, 5.06 M

(16.6 FT) SOUTH-WEST OF THE

ALUMINUM POWER POLE, 18.82 M (61.7 FT) NORTH-WEST

OF A MANGO TREE, 17.55 M

(57.6 FT) NORTH OF RESIDENTIAL CONCRETE STAIRS

AND 17.42-METER SOUTH-EAST OF

THE GUARD RAIL.

THE MONUMENT IS A U.S. DEPARTMENT OF INTERIOR

FOREST SERVICE BRASS DISK

EMBEDDED IN CONCRETE.

Observed: 2019-11-20T12:37:00Z Source: OPUS - page5 1801.18

Close-up View

REF_FRAME: NAD_83(2011) EPOCH: 2010.0000 SOURCE: H = h-N (N = GEOID18 HGT) UNITS: m SET PROFILE DETAILS

LAT: 18° 16' 50.49538" ± 0.017 m LON: -65° 43' 51.94607" ± 0.033 m

ELL HT: 216.755 ± 0.040 m X: 2490138.550 ± 0.044 m Y: -5523035.791 ± 0.018 m Z: 1987975.948 ± 0.023 m

ORTHO HT: 257.422 ± 0.091 m

UTM 20 SPC 5200(PRVI)

NORTHING: 2023400.599m 249656.683m

EASTING: 211251.460m 274251.259m

CONVERGENCE: -0.85726667° 0.21972222°

POINT SCALE: 1.00063090 0.99999428

COMBINED FACTOR: 1.00059680 0.99996021

CONTRIBUTED BY

hsanabria HLCM GROUp

Horizon View

The numerical values for this position solution have satisfied the quality control criteria of the National Geodetic Survey. The contributor has verified that the information submitted is accurate and complete.

EYNF06 JUAN DIEGO

Get directions: To here (nearest road)

Map data ©2020Report a map error

5/21/2020https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV44&ts=20141144319

PID: BBGV45

Designation: EYNF 07 DUQUE

Stamping: EYNF 07 DUQUE 2019 Stability: May hold, commonly subject to ground movement

Setting: Set in top of concrete monument Description: THE POINT IS ESTABLISHED AT THE RIGHT IN THE

GREEN AREA BETWEEN PR 971 AND

ACCESS TO THE ADJACENT VICINITY.IT IS 3.65 METERS

SOUTHWEST OF A UTILITY POLE,

ALSO 4.50 METERS SOUTHWEST OF A POLE TENSOR AND

1.00 METERS NORTH OF THE

PAVEMENT EDGE.

THE MONUMENT IS A U.S. DEPARTMENT OF

AGRICULTURE-FOREST SERVICE BRASS DISK

EMBEDDED IN CONCRETE.

Observed: 2019-11-20T12:56:00Z Source: OPUS - page5 1801.18

Close-up View

REF_FRAME: NAD_83(2011) EPOCH: 2010.0000 SOURCE: H = h-N (N = GEOID18 HGT) UNITS: m SET PROFILE DETAILS

LAT: 18° 15' 17.56372" ± 0.010 m LON: -65° 43' 52.75819" ± 0.008 m

ELL HT: 181.388 ± 0.057 m X: 2490471.127 ± 0.029 m Y: -5523831.477 ± 0.048 m Z: 1985251.554 ± 0.012 m

ORTHO HT: 221.972 ± 0.103 m

UTM 20 SPC 5200(PRVI)

NORTHING: 2020542.250m 246799.408m

EASTING: 211184.844m 274238.360m

CONVERGENCE: -0.85616667° 0.21965000°

POINT SCALE: 1.00063138 0.99999401

COMBINED FACTOR: 1.00060285 0.99996549

CONTRIBUTED BY

hsanabria HLCM GROUp

Horizon View

The numerical values for this position solution have satisfied the quality control criteria of the National Geodetic Survey. The contributor has verified that the information submitted is accurate and complete.

EYNF 07 DUQUE

Get directions: To here (nearest road)

Map data ©2020Report a map error

5/21/2020https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV45&ts=20141144331

PID: BBGV46

Designation: EYNF 08 MAIZALES

Stamping: EYNF 08 MAIZALES 2019 Stability: May hold, commonly subject to ground movement

Setting: Set in top of concrete monument Description: THE POINT IS AT THE LEFT SIDE OF THE FRONT OF MRS.

DELIA POMALES RESIDENCE.

IT IS 3.70 M (12.1 FT) SOUTH OF THE CORNER OF THE

HOUSE, ALSO 3.78 M (12.4 FT)

SOUTHWEST OF A UTILITY POLE AND 11.60 M (38.1 FT)

NORTHWEST OF THE 3.5 KM

(2.2 MI) SIGN.

THE STATION MONUMENT IS A U.S. DEPARTMENT OF

AGRICULTURE-FOREST SERVICE BRASS.

Observed: 2019-11-21T16:40:00Z Source: OPUS - page5 1801.18

Close-up View

REF_FRAME: NAD_83(2011) EPOCH: 2010.0000 SOURCE: H = h-N (N = GEOID18 HGT) UNITS: m SET PROFILE DETAILS

LAT: 18° 14' 22.04729" ± 0.016 m LON: -65° 45' 25.90924" ± 0.006 m

ELL HT: 83.640 ± 0.029 m X: 2488157.596 ± 0.013 m Y: -5525358.316 ± 0.025 m Z: 1983599.873 ± 0.018 m

ORTHO HT: 124.062 ± 0.091 m

UTM 20 SPC 5200(PRVI)

NORTHING: 2018875.570m 245082.261m

EASTING: 208421.287m 271508.340m

CONVERGENCE: -0.86358611° 0.21155556°

POINT SCALE: 1.00065121 0.99999395

COMBINED FACTOR: 1.00063805 0.99998080

CONTRIBUTED BY

hsanabria HLCM GROUp

Horizon View

The numerical values for this position solution have satisfied the quality control criteria of the National Geodetic Survey. The contributor has verified that the information submitted is accurate and complete.

Map data ©2020Report a map error

5/21/2020https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBGV46&ts=20141144343

DR5106 ***********************************************************************

DR5106 DESIGNATION - EYNF 09

DR5106 PID - DR5106

DR5106 STATE/COUNTY- PR/NAGUABO

DR5106 COUNTRY - US

DR5106 USGS QUAD - HUMACAO (2018)

DR5106

DR5106 *CURRENT SURVEY CONTROL

DR5106 ______________________________________________________________________

DR5106* NAD 83(2011) POSITION- 18 14 36.92352(N) 065 46 44.55989(W) ADJUSTED

DR5106* NAD 83(2011) ELLIP HT- 115.650 (meters) (05/12/20) ADJUSTED

DR5106* NAD 83(2011) EPOCH - 2010.00

DR5106 ______________________________________________________________________

DR5106 GEOID HEIGHT - -40.319 (meters) GEOID18 DR5106 NAD 83(2011) X - 2,486,004.281 (meters) COMP DR5106 NAD 83(2011) Y - -5,526,203.829 (meters) COMP DR5106 NAD 83(2011) Z - 1,984,044.289 (meters) COMP DR5106 LAPLACE CORR - -2.53 (seconds) DEFLEC18

DR5106

DR5106 Network accuracy estimates per FGDC Geospatial Positioning Accuracy DR5106 Standards:

DR5106 FGDC (95% conf, cm) Standard deviation (cm) CorrNE DR5106 Horiz Ellip SD_N SD_E SD_h (unitless)

DR5106 -------------------------------------------------------------------

DR5106 NETWORK 1.11 2.37 0.46 0.45 1.21 -0.08884376

DR5106 -------------------------------------------------------------------

DR5106 Click here for local accuracies and other accuracy information.

DR5106

DR5106

DR5106.The horizontal coordinates were established by GPS observations DR5106.and adjusted by the RLDA SURVEYING AND MAPPING in May 2020.

DR5106

DR5106.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has DR5106.been affixed to the stable North American tectonic plate. See DR5106.NA2011 for more information.

DR5106

DR5106.The horizontal coordinates are valid at the epoch date displayed above DR5106.which is a decimal equivalence of Year/Month/Day.

DR5106

DR5106.Significant digits in the geoid height do not necessarily reflect accuracy.

DR5106.GEOID18 height accuracy estimate available here.

DR5106

DR5106.Click photographs - Photos may exist for this station.

DR5106

DR5106.The X, Y, and Z were computed from…