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Geospatial Data

AerialDetectionSurveyR1_2000_2015.htm

Aerial Detection Survey for Region 1 2000-2015


Identification Information:

Citation:

Citation Information:

Originator: USDA Forest Service, Forest Health Protection.

Publication Date:

Title:

Aerial Detection Survey for Region 1 2000-2015

Geospatial Data Presentation Form: vector digital data

Series Information:

Publication Information:

Larger Work Citation:

Citation Information:

Publication Date:

Title:

Series Information:

Publication Information:

Online_Linkage: /Internet/FSE_DOCUMENTS/stelprd3792214.zip

Description:

Abstract:

Northern Region (R1) Aerial Insect and Disease 
Detection Survey(ADS)for insect and disease 
activity from 2000 to 2015

Purpose:

To display insect and disease damage information 
in R1 for the 2000 to 2015 ADS
NOTE  Update was made 4-2013 explanation in last 
paragraph in Supplement information and 3 additional 
Process Steps were added

Supplemental Information:

Aerial detection surveys are conducted annually to 
detect and monitor annual, visible, vegetation damage 
primarily caused by insects.   Aerial detection 
surveys are intended to detect new activity, to 
monitor the trend of ongoing activity, to provide 
general location information, and to subjectively 
rate levels of defoliation and mortality.  Manually 
mapping such activity has quantitative and positional 
accuracy limitations and does not maintain the same 
accuracy standards as most coverage's found in GIS 
databases.  It is not an absolute process, so the 
actual numbers may be greater or less than what is 
recorded in the data or reflected on the maps.
 
Briefly, aerial detection pest surveys are 
predominately flown from fixed wing aircraft where 
an observer uses a computer tablet to sketch each 
infestation site directly into the computer using 
the gps location of the plane and a 1:100000 
basemap in the computer to accurately place each 
site.  In circumstances where the computer tablet 
is not available, the observer uses 1:100000 paper 
maps to sketch the pest activity.  The observer 
sketches infestation sites by marking the center 
of each small infestation site with a point.  If a 
single infestation site is large, or the observer 
chooses to group a number of small infestation 
sites, then a polygon may be drawn around the outer 
perimeter this area.  At the same time, using visual 
observation, the observer subjectively records the 
defoliation rating or tree mortality for each point 
and polygon recorded.  It is important to note that 
not all damaging agents have mortality values (i.e. 
trees killed) associated with them.
 
When the digital data is brought in from the field it 
is given a final review for clarity and data accuracy.  
Any paper maps used are also review and are then either 
digitized directly or transferred by hand onto a clean 
paper map for digitizing.  Hand transfers are generally 
done using a light table or manually transferring the 
data.  The map scales for maps to be digitized are 
usually 1:100000.  At this time the survey boundary 
from the paper maps are also recorded for digitizing.  
This boundary is approximate and can vary widely 
depending on the surveyor.  Survey boundaries taken 
from the digital data are created directly from the 
planes flightline generally buffering out 2 miles from 
the right side of the plane.  On occasions where 2 
surveyors are working out both sides of the aircraft a 
full buffer is created.
 
Many sources of error are associated with the survey 
and post processing techniques.  All surveyors have 
different skill levels in their ability to identify 
damage, estimate mortality, and locate it accurately.  
Identification and data entry errors will always occur 
to some degree.  In the Intermountain Region, there 
have been 12 different aerial surveyors documenting 
insect and disease damage throughout the Region since 
the early 80's.  Recording mortality as an absolute 
number like 500 vs. an indirect number like 5 trees/
acre can cause a dramatic shift in number totals.  
Mortality numbers recorded as (trees/acre) tend to be 
higher than numbers recorded as an absolute value.  
Double counting trees is another source of error.  
The surveyors must determine whether a tree died 
during the past year or earlier, only documenting 
damage that they determine occurred between the 
present and the last time the area was surveyed 
(usually the preceding year).  Knowing when a tree 
died or was injured can be difficult to gauge and is a 
judgment call. The surveyors gauge the age of tree 
injury, by evaluating subtle color difference in 
foliage.  Time of day and weather affects lighting, 
visibility, and contrast, making it a challenge to 
pick out the damage color signatures necessary to 
make accurate observations.  It should also be noted 
that the survey plane speed is approximately 100 knots 
at an altitude from 1000' to 3000' above ground level.  
Observers on average are evaluating a swath width of 
about 3 miles wide at any one time.  This gives 
observers about 20 sec/mile to identify, process, and 
document all the visible damage occurring.  Beyond 
observer errors, post processing of paper maps can 
introduce, digitizing and data entry errors.  Lumping 
data points for map clarity can introduce averaging 
errors in summarization tables.
 
Aerial detection survey information is not as precise 
as aerial photography, or ground surveys but is the 
most cost efficient method to meet the intended 
purposes mentioned above.
Use Constraints:
The Forest Service uses the most current and complete 
data available.  GIS data and product accuracy may vary.  
They may be developed from sources of differing accuracy, 
accurate only at certain scales, based on modeling or
Interpretation, incomplete while being created or 
revised, etc.  Using GIS products for purposes other than 
those for which they were created, may yield inaccurate 
or misleading results.  The Forest Service reserves the 
right to correct, update, modify, or replace, GIS products 
without notification.  Not a survey product.

Point of Contact:

Contact Information:

Contact Person Primary:

Contact Person: Terri Johnson

Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office

Detached unit Colville NF

Contact Position: Biological Technician

Contact Voice Telephone: 509.684.7253

Contact Electronic Mail Address: tljohnson01@fs.fed.us

 

 

 

 

 

 

 

 

 

 

 

 

 

Security Classification: Unclassified

Native Data Set Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcGIS 10.0.3.3600

Cross Reference:

Citation Information:

Originator: USDA Forest Service, Forest Health Protection

Publication Date: Unpublished Material

Title:

r1ads2013dmg
Geospatial Data Presentation Form: vector digital data

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Data Quality Information:
Attribute Accuracy:
Attribute Accuracy Report:
Less than 1% of the data was ground truthed for accuracy.
Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: Scott Sontag, Forest Health Protection, 200 East Broadway,Missoula,MT. 59802 406-329-3323
Title:
ADS digital sketch maps of Northern Region for 2013 (surveyor Sontag)
Geospatial Data Presentation Form: vector digital data
Source Scale Denominator: 1:100000
Type of Source Media: online
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: July 1, 2013
Ending Date: Sept 23 2013
Source Currentness Reference:
ground condition
Source Citation Abbreviation:
ADS Sontag
Source Contribution:
Digital data from a computerized sketchmap system.  Survey data for 2013 ADS
Forested lands in Montana, parts of N.Idaho and WyomingSource Information:
Source Citation:
Citation Information:
Originator: Scott Sontag, Forest Health Protection, 200 East Broadway,Missoula,MT. 59802 406-329-3323
Publication Date: Unpublished Material
Title:
ADS digital sketch map data of the Northern Region for 2013 (surveyor Casey)
Geospatial Data Presentation Form: vector digital data
Source Scale Denominator: 1:100000
Type of Source Media: online
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: July 1, 2013
Ending Date: Sept 23 2013
Source Currentness Reference:
ground condition
Source Citation Abbreviation:
ADS Casey
Source Contribution:
Digital data from a computerized sketchmap system.  Survey data for 2013 ADS
Forested lands in Montana, parts of N.IdahoSource Information:
Source Citation:
Citation Information:
Originator: Scott Sontag, Forest Health Protection, 200 East Broadway,Missoula,MT. 59802 406-329-3323
Publication Date: Unpublished Material
Title:
ADS digital sketch map data of the Northern Region for 2013 (surveyor Hayes)
Geospatial Data Presentation Form: vector digital data
Source Scale Denominator: 1:100000
Type of Source Media: online
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: July 23 2013
Ending Date: Sept 13 2013
Source Currentness Reference:
ground condition
Source Citation Abbreviation:
ADS Hayes
Source Contribution:
Digital data from a computerized sketchmap system.  Survey data for 2013 ADS
Forested lands in Montana, parts of N.IdahoSource Information:
Source Citation:
Citation Information:
Originator: Scott Sontag, Forest Health Protection, 200 East Broadway,Missoula,MT. 59802 406-329-3323
Publication Date: Unpublished Material
Title:
ADS Paper data of the Northern Region for 2013 (surveyor State Contractor Beckman)
Geospatial Data Presentation Form: vector digital data
Source Scale Denominator: 1:100000
Type of Source Media: paper
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: July 1, 2013
Ending Date: July 25, 2013
Source Currentness Reference:
ground condition
Source Citation Abbreviation:
ADS Beckman
Source Contribution:
Survey data for 2012 ADS (Portions of Northern Idaho)
Source Information:
Source Citation:
Citation Information:
Originator: Scott Sontag, Forest Health Protection, 200 East Broadway,Missoula,MT. 59802 406-329-3323
Publication Date: Unpublished Material
Title:
ADS digital sketch map data of the Northern Region for 2013 (surveyor Matthews)
Geospatial Data Presentation Form: vector digital data
Source Scale Denominator: 1:100000
Type of Source Media: online
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: Sept 17 2013
Ending Date: Sept 23 2013
Source Citation Abbreviation:
ADS Matthews
Source Contribution:
Digital data from a computerized sketchmap system.  Survey data for 2013 ADS
Forested lands in Montana, parts of N.IdahoSource Information:
Source Citation:
Citation Information:
Originator: Scott Sontag, Forest Health Protection, 200 East Broadway,Missoula,MT. 59802 406-329-3323
Publication Date: Unpublished Material
Title:
ADS digital sketch maps of Northern Region for 2013 (surveyor Nelson)
Geospatial Data Presentation Form: vector digital data
Source Scale Denominator: 1:100000
Type of Source Media: online
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: Sept 17 2013
Ending Date: Sept 23 2013
Source Currentness Reference:
ground condition
Source Citation Abbreviation:
ADS Nelson
Source Contribution:
Digital data from a computerized sketchmap system.  Survey data for 2013 ADS
Forested lands in Montana, parts of N.IdahoProcess Step:
Process Description:
-GeoDataBase Created   ADS2013.gdb
-Each aerial surveyor submitted separate shapefiles of points and polygon for each days survey. These shapefiles were combined into one batch many over a several day period with other surveyors and it is these baches that named as Packets with a Letter, Apacket to Spacket were created
-All data files flightlines, polygons and multipoint files were reprojected to NAD 1983 Albers.
-These were entered into a master geodatabase under 3 separate feature data sets for points and polygons and flightlines.
-After the shapefiles were added to the GDB, coding and geospatial errors were corrected on each file.Source Used Citation Abbreviation:
ADS Sontag
Source Used Citation Abbreviation:
ADS Casey
Source Used Citation Abbreviation:
ADS Hayes
Source Used Citation Abbreviation:
ADS Beckman
Source Used Citation Abbreviation:
ADS Matthews
Source Used Citation Abbreviation:
ADS Nelson
Process Date: July-October 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/packet letter (Apacket-Spacket)
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: (509)684-7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
-Each time a batch of survey days were submitted for processing (usually about 10 files) the polygon feature classes were merged into a single packet file where any overlap was resolved using topology. The code field would be summarized to locate errors.
Source Used Citation Abbreviation:
ADS2013.gdb/packet letter (Apacket-Spacket)
Process Date: July-October 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/Apolys - Spolys
Source Produced Citation Abbreviation:
ADS2013.gdb/packet letter {timestamp} for points
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
-Once all of the data had been recieved and the initial processing was completed the polygon packets were merged  (sketchmap data and paper data) into a single regional polygon feature class and topology used to resolve any final overlap
-All point feature classes were also merge at this point to create a regional point feature class.Source Used Citation Abbreviation:
ADS2013.gdb/Apolys - Spolys plus Beckpolys
Source Used Citation Abbreviation:
points packetletter {timestamp}
Source Used Citation Abbreviation:
Bpolys
Source Used Citation Abbreviation:
Cpolys
Source Used Citation Abbreviation:
Dpolys
Source Used Citation Abbreviation:
Epolys
Source Used Citation Abbreviation:
Fpolys
Source Used Citation Abbreviation:
Gpolys
Source Used Citation Abbreviation:
Hpolys
Source Used Citation Abbreviation:
Ipolys
Source Used Citation Abbreviation:
Jpolys
Source Used Citation Abbreviation:
Kpolys
Source Used Citation Abbreviation:
Spolys
Process Date: Sept 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/Allpolys
Source Produced Citation Abbreviation:
ADS2013.gdb/Allpoints
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
A model using python scripts was used: mADS-Initial P/T process
    -Add and populate the ADS national standard fields to both point and polygon regional data, based on a code field from the original shapefiles.
    -Create individual buffer radius's for point data, based on mortality parameters set by the user.
    -Buffer the point data based on those radius's to create a polygon shapefile based on point informationSource Used Citation Abbreviation:
ADS2013.gdb/Allpolys
Source Used Citation Abbreviation:
ADS2013.gdb/Allpoints
Process Date: Nov 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/AllMergeout
Source Produced Citation Abbreviation:
AllptBuffer
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
A second model 'mPostProcessing' is used to complete data processing.  Part I merges the buffered point and polygon layers where topology is completed to resolve the polygon/point and point/point overlap
In  Part II of the model various fields are dropped and 2 more python scripts are run created national dataset fields and calculating the TPA field at this output located many missing codes that needed correction.Source Used Citation Abbreviation:
ADS2013.gdb/AllMergeout
Process Date: Nov 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/AllTPApart2Out
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
Another GDB was created > DR_Master/DAMAGE
 
The data is loaded into a template to run ESRI's Data Reviewer and tests to validate codes and locate other data anomolies and geometry errors to be corrected.Source Used Citation Abbreviation:
ADS2013.gdb/AllTPApart2Out
Process Date: Nov 2013
Source Produced Citation Abbreviation:
DR_Master.gdb/DAMAGE
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Address:
Address Type: mailing and physical address
Address:
765 South Main Street
City: Colville
State or Province: Wa
Postal Code: 99114
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
DAMAGE feature class was imported back to the ADS2013.gdb  for further processing
Ran the Clip Tool to clip out areas overlapped into canada and outside the R1 boundary.Source Used Citation Abbreviation:
DR_Master.gdb/DAMAGE
Process Date: Nov 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/r1Damage
Source Produced Citation Abbreviation:
ADS2ADS2013.gdb/r1DamageC
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
Within the Model two python scripts were run to finish the data processing
Source Used Citation Abbreviation:
ADS2013.gdb/r1DAMAGEC
Process Date: Nov 2013
Source Produced Citation Abbreviation:
ADS2013.gdb/ads2013_app
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
The feature class is exported out as a shapefile and a final data consistency program was run. This program locate anomolies which did not show up under the initial data inspection.
Final corrections are made and all remaining data fields which had not been populated by previous programs are completed.  Source Used Citation Abbreviation:
ADS2013.gdb/ads2013_app
Process Date: Nov 2013
Source Produced Citation Abbreviation:
r1ads2013app.shp
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
Metadata is completed for the dataset
Source Used Citation Abbreviation:
r1ads2013app.shp
Process Date: Nov 2013
Source Produced Citation Abbreviation:
r1ads2013app.shp
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office Detached unit Colville NF
Contact Position: Biological Technician
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs.fed.us
Process Step:
Process Description:
-Transferred data captured by the Region 4 ADS falling in Region 1, to the R1 dataset.
  -Clipped R4 dataset using R1 regional boundary
  -merge resulting clip file with original r1ads2013app  >>>  ads2013.gdb/finalcorrections/r1r4clip_merge
-Resolved topology with the new data and recalculated all affected data fields.
-exported corrected r1r4clip_merge out of the GDB and into a new r1ads2013app dataset.
-Updated the metadataSource Used Citation Abbreviation:
r4ads2013dmg.shp
Source Used Citation Abbreviation:
r1ads2013app
Source Used Citation Abbreviation:
r1fhpbdy.shp
Process Date: 01/13/2014
Source Produced Citation Abbreviation:
(new) r1ads2013app
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Dick Halsey
Contact Organization: USDA Forest Service, Forest Health Protection, Boise Field Office
Contact Position: Gis Coordinator
Contact Address:
Address Type: mailing and physical address
Address:
1249 S. Vinnell Way, Suite 200
City: Boise
State or Province: Idaho
Postal Code: 83709
Contact Voice Telephone: (208)373-4267
Contact Facsimile Telephone: (208)373-4332
Contact Electronic Mail Address: rhalsey@fs.fed.us
Process Step:
Process Description:
-Missed* data from 071713 translation file was processed separately and merged with the r1ads2013dmg layer
(this data file contained 120 polys and bufferd points)
-Metatdata updated
 
*Missed data that had not been uploaded from sketchmapper and was noticed after the original national dataset had been processedSource Used Citation Abbreviation:
r1ads2013app version 01/13/14
Source Used Citation Abbreviation:
Bvhd0717
Process Date: Jan.29, 2014
Source Produced Citation Abbreviation:
r1ads2013app version 01/30/14
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Terri Johnson
Contact Organization: Boise Field Office FHP
Contact Position: Bio Tech
Contact Voice Telephone: 509.684.7253
Contact Electronic Mail Address: tljohnson01@fs,fed,us
 

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Spatial Data Organization Information:

Point and Vector Object Information:

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Spatial Reference Information:

Horizontal Coordinate System Definition:

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983

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Entity and Attribute Information:

Detailed Description:

Entity Type:

Entity Type Label: AerialDetectionSurveyR1_2012

Attribute:

Attribute Label: OBJECTID_1

Attribute Definition:

Internal feature number.

Attribute Definition Source:

ESRI

Attribute Domain Values:

Unrepresentable Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute Label: OBJECTID

Attribute Definition:

Internal feature number.

Attribute Definition Source:

ESRI

Attribute Domain Values:

Unrepresentable Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute Label: Shape

Attribute Definition:

Feature geometry.

Attribute Definition Source:

ESRI

Attribute Domain Values:

Unrepresentable Domain:

Coordinates defining the features.

Attribute:

Attribute Label: CODE

Attribute:

Attribute Label: DM_Notes

Attribute:

Attribute Label: MapName

Attribute:

Attribute Label: codepiece1

Attribute:

Attribute Label: codepiece2

Attribute:

Attribute Label: codepiece3

Attribute:

Attribute Label: rpt_yr

Attribute:

Attribute Label: survey_id1

Attribute:

Attribute Label: survey_id2

Attribute:

Attribute Label: survey_id3

Attribute:

Attribute Label: dmg_type1

Attribute:

Attribute Label: dmg_type2

Attribute:

Attribute Label: dmg_type3

Attribute:

Attribute Label: severity1

Attribute:

Attribute Label: severity2

Attribute:

Attribute Label: severity3

Attribute:

Attribute Label: pattern1

Attribute:

Attribute Label: pattern2

Attribute:

Attribute Label: pattern3

Attribute:

Attribute Label: tpa1

Attribute:

Attribute Label: tpa2

Attribute:

Attribute Label: tpa3

Attribute:

Attribute Label: no_trees1

Attribute:

Attribute Label: no_trees2

Attribute:

Attribute Label: no_trees3

Attribute:

Attribute Label: dca1

Attribute:

Attribute Label: dca2

Attribute:

Attribute Label: dca3

Attribute:

Attribute Label: host1

Attribute:

Attribute Label: host2

Attribute:

Attribute Label: host3

Attribute:

Attribute Label: for_type1

Attribute:

Attribute Label: for_type2

Attribute:

Attribute Label: for_type3

Attribute:

Attribute Label: acres

Attribute:

Attribute Label: notes

Attribute:

Attribute Label: Data

Attribute:

Attribute Label: Bug1

Attribute:

Attribute Label: Bug2

Attribute:

Attribute Label: Bug3

Attribute:

Attribute Label: Orgac

Attribute:

Attribute Label: R1notes

Attribute:

Attribute Label: Shape_Leng

Attribute:

Attribute Label: Shape_Le_1

Attribute:

Attribute Label: Shape_Length

Attribute Definition:

Length of feature in internal units.

Attribute Definition Source:

ESRI

Attribute Domain Values:

Unrepresentable Domain:

Positive real numbers that are automatically generated.

Attribute:

Attribute Label: Shape_Area

Attribute Definition:

Area of feature in internal units squared.

Attribute Definition Source:

ESRI

Attribute Domain Values:

Unrepresentable Domain:

Positive real numbers that are automatically generated.

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https://www.fs.usda.gov/detailfull/r1/landmanagement/gis/?cid=stelprdb5430191&width=fu