Appendix_C_accuracy_standards.pdf

PDF 148 KB Posted May 26, 2013

Attached to: Lidar Field Data - GPS & Stand Exam Federal contract opportunity
Solicitation number: AG-8379-S-13-0009
Issued by: Department of Agriculture Forest Service R3-Southwestern Region

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Appendix C - Accuracy Standards

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User Guide Appendices Appendix L: Accuracy Standards

L‐1

APPENDIX L: ACCURACY STANDARDS

August 2012

Settings Measurements Field Tolerance

Project	Name	No	Errors
Region	No	Errors
Proclaimed	Forest	No	Errors
District	No	Errors
Location	No	Errors
Stand	Number	No	Errors
Ownership	No	Errors
State	No	Errors
County	No	Errors
Administrative	Forest	No	Errors
Date	No	Errors
Photo	ID	No	Errors
Exam	Level	No	Errors
Exam	Purpose	No	Errors
Stratum	No	Errors
Existing	Vegetation	Composition	Type	No	Errors
Potential	Vegetation	Reference	No	Errors
Potential	Vegetation	No	Errors
Structure	No	Errors
Capable	Growing	Area	±	10	Percent
Fuel	Model	No	Errors
Elevation	±	2	Contour	Intervals
Aspect	±	45	degrees
Slope	±	10	Percent
Slope	Position	±	1	class
Acres	No	Errors
Radial	Growth	Interval	No	Errors
Radial	Growth	Interval	#2	No	Errors
Height	Growth	Interval	No	Errors
Fuel	Photo	Reference	No	Errors
Precision	Protocol	No	Errors
Examiner	No	Errors
Stand	Remarks	No	Errors
Damage	Category	No	Errors
Damage	Agent	No	Errors
Damage	Severity	No	Errors
Species	of	Management	Interest	No	Errors
Sketch	Map	and	Traverse	Notes

Appendix L: Accuracy Standards User Guide Appendices

L‐2

Sample Design Criteria Field Tolerance

Form	Type
Selection	Method	Type	No	Errors
Sample	Expansion	Factor	No	Errors
Plots	Installed	No	Errors
Sub	population	Filter	No	Errors
Starting	Azimuth	No	Errors
Sample	Design	Remarks	No	Errors
Selection	Criteria	Number	No	Errors
Sub	pop	Variable	No	Errors
Sub	pop	Minimum	Value No	Errors
Sub	pop	Maximum	Value	No	Errors

Plot Data

Plot

Number

Errors

Plot

Latitude

Errors

Plot

Longitude

Errors

Capable

Grow

Area

Percent

Plot

Aspect

45°

Plot

Slope

Percent

Slope

Position

Class

Slope

Horizontal

Shape

Class

Slope

Vertical

Shape

Class

Plot

Elevation

Contour

Intervals

Existing

Vegetation

Errors

Potential

Vegetation

Accurate

series

understory

union

and

phases

Plot

History

Errors

Plot

History

Date

Year

required

field

other

than

code

blank

Fuel	Model	No	Errors
Residual	Descriptive	Code	No	Errors
Distance	to	Seed	wall	±	100	feet
Plot	Remarks

L‐3

Tree Data

Field	Tolerance
Plot	Number	No	Errors
Tag	ID	Number	No	Errors
Tree	Status	No	Errors	allowed	in	recognizing	and	coding	down	trees.
Site/Growth	Trees	No	Errors
Tree	Species	No	Errors
Tree	Count	Height	Diameter Trees

Range	Range	on	Point	Tolerance
*All	All		0	0	trees
<0.5	feet			1‐5	±	2	trees
<0.5	feet			6+	±	50%
>0.5	feet	<0.5	in.		1‐5	±	1	tree
>0.5	feet	<0.5	in		6+	±	20%
All	.5"	‐	breakpoint	DBH		1‐5	±	1	tree
All	.5"	‐	breakpoint	DBH		6+	±	10%
All	breakpoint	DBH+		1+	0	trees

*There

tolerance

for

recording

tree

when

none

are

actually

present

any

the

above

size

classes.

The

recording

fixed

plot

tree

when

none

are

present

will

result

single

discrepancy.

The

recording

variable

plot

tree

when

none

are

present

will

result

unacceptable

unit.

1/	Grouping	criteria	are	standardized	to	facilitate	stand	exam	contract
inspection	and	payment.		However,	distinguishing	characteristics	other	than	tree
class,	species,	and	size	class	may	warrant	individual	tree	recording	or	more
refined	grouping	criteria.		Such	characteristics	include	age,	crown	ratio,	crown
class,	or	incidence	of	damage.

Number Stems No Errors

DBH/DRC

Intensive Exam

No	Errors	<.5	inch
±		.1	Inch	.5	inch	‐	13.9	inches
±		.2	Inch	14.0	inches	‐	23.9	inches
±		.3	Inch	24.0	inches	‐	34.9	inches
±		.5	Inch	35.0	inches	+
±		.1	Inch	Borderline	variable	plot	trees
±			1	Inch	Estimated	DRC

DBH/DRC

Extensive Exam

±	1	Inch	≤	20	inches
±	5%	of	diameter	>	20	inches

DBH/DRC

Quick Exam

±	2	Inches	≤	20	inches
±	10%	of	diameter	>	20	inches

Height	±	10	%
Height	to	Crown	±	10	%
Radial	Growth	±	1/20	inch
Radial	Growth	#2	±	1/20	inch
Height	Growth	±	1	foot		trees	>6	feet

0.1

foot

trees

≤6

feet

Tree

Age

10%

(Based

actual

tree

ring

count

breast

height

for

trees

>	3.0"	DBH	otherwise	based	on	total	age	recorded.)
Crown	Ratio	±	10	%
Crown	Class	No	Errors
Crown	width	No	Errors

Appendix L: Accuracy Standards User Guide Appendices

L‐4

Tree Data (cont.)

Field Tolerance

Wildlife	Use	No	Errors
Log/Snag	Decay	No	Errors
Cone	Serotiny	No	Errors
Damage	Category	No	Errors
Damage	Category	Damage	Category

Description Tolerance

11 Bark Beetles No misses on live trees with a severity of 2 or greater.

12 Defoliators No misses on live trees with a severity of 3 or greater.

13‐17 Other Insects No misses of shoot moths or weevils on live trees.

21 Root/Butt Diseases No misses on live trees with a severity of 2 or greater.

22 Stem Decays/Cankers No misses on live trees with a severity of 3 or greater.

25	Foliage	Diseases No	misses	on	Elytroderma	on	live	trees.
41‐42	Animal	Damage No	misses	on	live	trees	with	terminal	leader

damage	or	with	greater	than	1/4	of	bole
circumference	affected.

50	Abiotic	Damage No	misses	on	wind,	snow,	or	ice	bending,
breakage,	or	bole	cracks	and	frost	damage	to
shoots	on	trees	less	than	1‐inch	diameter	and

lightning.

70	Human	Damage No	misses	on	live	trees	for	logging	damage	or
fire	if	the	damage	affects	greater	than	1/4	of
the	bole	circumference	or	if	an	open	wound	is
in	contact	with	the	ground.

Damage	Agent
Damage	Part
Damage	Severity
Tree	Remarks

Ground Surface Cover

Plot	Number	No	Errors
Cover	Type	No	Errors
Cover	Percent	±	10	Percent

L‐5

Vegetation Composition Field Tolerance

Plot	Number	No	Errors
Live	/Dead	No	Errors
Layer	No	Errors
Life	form	No	Errors
Species	No	Error	in	species	level	identification	for	dominant,	common

or	community	type	indicator	plants.	No	plant	name	can	be
repeated	within	a	layer.

Minimum	Height	±	10%	of	Height
Average	Height	±	10%	of	Height
Maximum	Height	±	10%	of	Height
Canopy	Cover	±	10	Percent
Average	Diameter	No	Errors
Maturity	No	Errors
Cover	Remarks
User	Field

Down Woody

Plot	Number	No	Errors
First	Duff	±	1/2	inch
Second	Duff	±	1/2	inch
Fuel	Depth	No	Errors
Twigs	0	‐	.24	±	40%
Twigs	.25	‐	.99	±	30%
Branch	1.0	‐	2.99	±	20%
Volume	1
Weight	1
Volume	2
Weight	2
Volume	3
Weight	3
Volume	4
Weight	4
Piece	Count		No	missed	pieces
Decay	Class		No	Errors
Diameter	±	1	inch	on	measurements
Piece	Length	No	Errors

File details come from the government source that posted it. Updated Nov 14, 2017.