GAP Terrestrial Habitat Map
|Date||January 2008 - May 2008|
|Categories||Land Cover, Wildlife Management|
|Capabilities||Analysis of Remote Sensing Data, Geospatial Database Development, Products and Services, Visualization|
Kansas Department of Wildlife and Parks
At the request of Kansas Department of Wildlife and Parks (KDWP), the Kansas Applied Remote Sensing program at the Kansas Biological Survey worked to reformat the Kansas GAP vegetation map from 43 alliance level vegetation classes to represent 17 terrestrial habitats. The GAP land cover to habitat associations were provided by KDWP via a spreadsheet that showed how the class groupings were to be assigned. The desired final product was a series of ArcShapefiles, one for each habitat class. To produce these files, the following processes were performed.
Using Erdas Imagine, the Kansas GAP land cover map was recoded to assign each GAP grid code to a new KDWP habitat value (1-17). A Clump (4 neighbors) and Eliminate process was used to filter out parcels smaller than 4 pixels (0.88 acres). This process only partially worked, as there were still a number of 1-pixel patches of each land cover type (150 out of 1,254,381 total polygons), far fewer than before the process. These isolated pixels appeared to be the result of instances where the majority replacement function could not work because the pixels were bordered by an equal number of different land cover types (i.e. 2 crop and 2 forest) so no majority replacement value could be determined. Using ArcGIS, the raster habitat file was converted to a polygon shapefile. Attributes were added for habitat type and area, then the area was calculated for all polygons.
Project leader, Kansas Applied Remote Sensing Program