Appx_B_Harbor_Depth.doc
DOC document 250 KB Posted
- Attached to
- Annual Barge ServicesKalaupapa National Historic
- Solicitation number
- 140P8225R0008
About this file
This document is a metadata file describing a hydrographic survey of Kalaupapa harbor on Moloka'i, conducted using the SHOALS (Scanning Hydrographic Operational Airborne Lidar Survey) system by the U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise. The survey collected bathymetric data from the shoreline to -30m depths using an airborne laser system that can measure 400 soundings per second from a DHC-6 Twin Otter aircraft flying at 200-400 meters altitude.
The survey provides precise spatial data with horizontal positional accuracy of ±3 meters and vertical positional accuracy of ±15 cm. The lidar system operates by emitting light pulses that reflect off the water surface and sea bottom, with depth measurement determined by the time difference between surface and bottom returns. The data is relevant to the Kaluanui Point area, collected in November 2000, and can be used with an acknowledgment to the U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise. The document is associated with a related federal contract opportunity (Solicitation Number: 140P8225R0008) for Annual Barge Services at Kalaupapa National Historic Park, issued by the Department of the Interior National Park Service.
View the file
Other files
| File | Type | Posted |
|---|---|---|
| A05_PWS_KALA_Barge_2025.docx | DOCX document | |
| Sol_140P8225R0008.pdf | ||
| Appx_A_Harbor_Bathymetry.xlsx | XLSX spreadsheet | |
| Appx_D_Sample_Manifest.xlsx | XLSX spreadsheet | |
| Appx_E_Kalaupapa_Visitor_Rules.pdf | ||
| Appx_C_Harbor_Drawings.pdf |
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
Figure 1. Kalaupapa harbor on Moloka‘i showing depth contours in meters. Water depths are at Mean Lower Low Water (MLLW). To convert from meters to feet multiply by 3.28.Depth contours derived from U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise.
Metadata for bathymetry contours.
Abstract
These data were collected by the SHOALS (Scanning
Hydrographic Operational Airborne Lidar Survey) system which consists of an airborne laser transmitter/receiver capable of measuring 400 soundings per second. The system operates from a deHavilland DHC-6 Twin Otter flying at altitudes between 200 and 400 meters with a ground speed of about 100 knots. The SHOALS system also includes a ground-based data processing system for calculating acurate horizontal position and water depth.
Lidar is an acronym for LIght Detection And Ranging. The system operates by emitting a pulse of light that travels from an airborne platform to the water surface where a small portion of the laser energy is backscattered to the airborne receiver. The remaining energy at the water's surface propogates through the water column and reflects off the sea bottom and back to the airborne detector. The time difference between the surface return and the bottom return corresponds to water depth. The maximum depth the system is able to sense is related to the complex interaction of radiance of bottom material, incident sun angle and intensity, and the type and quantity of organics or sediments in the water column. As a rule-of-thumb, the
SHOALS system should be capable of sensing bottom to depths equal to two or three times the Secchi depth.
Purpose
The purpose of the Kaluanui Point survey was to collect and map data from the shoreline to -30m depths.
Time period for which the data is relevant
Date and time: 20001100
Description:
Ground Condition Publication Information
Who created the data: US Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise.(ed.)
Date and time: 20010500 at time Unknown
Constraints on accessing and using the data
Access constraints: None Use constraints:
Acknowledgement of the U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise
(JALBCTX) would be appreciated in products derived from these data.
Who completed this document
Eddie Culpepper REQUIRED: The person responsible for the metadata information.
USACE
REQUIRED: The organization responsible for the metadata information.
mailing and physical address:
OP-J
109 St. Joseph Street
Mobile, AL 36602
251-690-3467 (voice)
Currentness of this source
Date and time: 20001100
Spatial data quality
Horizontal positional accuracy
+/- 3 meters (1 sigma)
Vertical positional accuracy
+/- 15 cm (1 sigma)
File details come from the government source that posted it. Updated .