More than 23,000 field measurements of cheatgrass cover were acquired from various agencies and research groups across the study area and reviewed for use in the mapping effort. A subset of 6650 field measurements were used to statistically evaluate relationships between cheatgrass and a suite of 50 biophysical and remotely sensed (NDVI) variables. Variables were examined for pairwise correlation and highly correlated variables were discarded from the analysis. Eighteen of the 50 variables were selected to construct a Generalized Linear Model to classify cheatgrass occurrence. A decision rule based on strength of class membership was used to classify the study area as containing either 0-2% or >2% cheatgrass cover....
Types: Citation;
Tags: Arizona,
CRS,
California,
Cheatgrass,
Colorado, All tags...
Greater sage-grouse,
Historic Range of greater sage-grouse,
Idaho,
Montana,
Nebraska,
Nevada,
New Mexico,
North Dakota,
Oregon,
SageDAT-data,
ScienceFramework,
South Dakota,
Utah,
Washington,
Wyoming,
environment, Fewer tags
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