Metadata for Woodland Draws Metadata for Woodland Draws

Download full XML Metadata

Identification Information:

Citation:

Originator: University of Montana Spatial Analysis Lab
Title: Woodland Draws
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Geodatabases/WoodlandDraw_Deliverables_SAL_20221115.zip

Abstract:

Using NAIP imagery, Spatial Analysis Lab analysts at the University of Montana delineated woodland draw extents. Woodland draws were delineated using the Montana Natural Heritage Program's definition of the Woodland Draw and Ravine ecological system as a guide (https://fieldguide.mt.gov/displayES_Detail.aspx?ES=4328). Once draws were delineated, they were assigned an amiguity score indicating the analysts confidence that the feature was indeed a woodland draw. Finally, draws were attributed with various environmental variables from other data sources to inform further analysis and field work.

Purpose:

The digitized draws represent an inventory woodland draws across Bureau of Land Management (BLM) lands in Montana, North Dakota and South Dakota to the extent that they can be identified and delineated via aerial imagery. The goal of this was to provide the BLM with an inventory of wooded draws and to idenitfy locations for field data collection.

Time period of content:

Calendar date: 01/18/2023
Currentness reference: publication date

Status:

Progress: Complete

Access constraints: None

Use constraints: None

Point of contact:

Montana Spatial Analysis Lab
NS 313, 32 Campus Drive
Missoula, Montana 59812
Telephone: 406-243-5196
E-Mail: ryan.rock@mso.umt.edu

Data set credit: University of Montana - Spatial Analysis Lab

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: GT-polygon composed of chains

SDTS object count: 8014

Spatial Reference Information:

Horizontal coordinate system definition:

Map projection:

Map projection name: WGS 1984 Web Mercator Auxiliary Sphere
Map projection parameters:

Planar distance units: meter

Geodetic model:

Horizontal datum name: D WGS 1984
Ellipsoid name: WGS 1984
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257223563

Entity and Attribute Information:

Entity type label: Digitized_Draws

Attribute label: FID

Attribute definition: Internal feature number.
Attribute domain:: Sequential unique whole numbers that are automatically generated.

Attribute label: SHAPE

Attribute definition: Feature geometry.
Attribute domain: Coordinates defining the features.

Attribute label: oid_1

Attribute label: ground_tru

Attribute definition:: If the draw was visited in the field, this was the dominant species along the transect that was surveyed.

Attribute label: OBJECTID

Attribute label: F_Intercept

Attribute definition: Y intercept from the harmonic regression equation.

Attribute label: year

Attribute definition:: Coefficient for the year term in the harmonic regression equation (in radians).

Attribute label: sig

Attribute definition:: Significance value of the ndvi magnitude coefficient from the harmonic regression equation.

Attribute label: access

Attribute definition:: Ratings of accessibility for field visits based on terrain, ownership and proximity to roads.

Attribute label: draw_type

Attribute definition:: Categorization of draw vegetation type based on machine learning model prediction.

Attribute label: trees

Attribute definition:: Percent cover from Rangeland Analysis Platform (RAP) for 2021.

Attribute label: annuals

Attribute definition:: Percent cover from Rangeland Analysis Platform (RAP) for 2021.

Attribute label: bare

Attribute definition:: Percent cover from Rangeland Analysis Platform (RAP) for 2021.

Attribute label: shrub

Attribute definition:: Percent cover from Rangeland Analysis Platform (RAP) for 2021.

Attribute label: twi

Attribute definition: Topographic wetness index derived from DEM.

Attribute label: cos

Attribute definition: artifact - not needed

Attribute label: sin

Attribute definition: artifact - not needed

Attribute label: pnull

Attribute definition:: Percent of pixels in the draw where the TWI was null (flat/no slope).

Attribute label: perennial

Attribute definition:: Percent cover from Rangeland Analysis Platform (RAP) for 2021.

Attribute label: litter

Attribute definition:: Percent cover from Rangeland Analysis Platform (RAP) for 2021.

Attribute label: area

Attribute definition: Draw area in square meters.

Attribute label: perim

Attribute definition: Draw perimeter in meters.

Attribute label: magnitude

Attribute definition:: Average kNDVI amplitude from 1990-2020 computed by fitting a harmonic regression model to each pixel. Interpretted as the yearly average change in kNDVI for each draw polygon.

Attribute label: northing

Attribute label: easting

Attribute label: mean_cos

Attribute definition: Average cosine of slope aspect (northness) for the draw.

Attribute label: mean_sin

Attribute definition: Average sine of the slope aspect (eastness) for the draw.

Attribute label: shape_rati

Attribute definition: Draw perimeter / draw area.

Attribute label: k

Attribute definition:: Strata ID from the k-means clustering performed on the draws prioir to field sampling.

Attribute label: ambiguous

Attribute definition:: Score indicating analyst's confidence that the mapped feature is indeed a woody draw. Added during the QA/QC process prior to field work. 0 represents high confidence that the mapped feature is a draw. 1 indicates the feature may not fully meet the definition of a draw. 2 indicates that the draw overlaps wetlands as mapped by the National Wetlands Inventory (NWI).

Attribute label: predicted