Southwest Regional Landform Data
|
FGDC Metadata |
 |
Landform
Ten landform position classes defined by topographic position and slope gradients were modeled using a GIS. The ten landform classes are: 1) Valley flats, 2) Gently sloping toe slopes, 3) Gently sloping ridges, fans and hills, 4) Nearly level terraces and plateaus, 5) Very moist steep slopes, 6) Moderately moist steep slopes, 7) Moderately dry steep slopes, 8) Very dry steep slopes, 9) Cool aspect scarps, cliffs and canyons, and 10) Hot aspect scarps, cliffs and canyons. The GIS model was created using ArcInfo AML and a 30 meter DEM (digital elevation model). DEM data was from the USGS National Elevation Dataset (1999). The geographic extent for the modeling area encompassed the states of Arizona, Colorado, New Mexico, Nevada and Utah. While the modeling area encompassed these 5 southwestern states, the actual GIS dataset downloaded from this site may be a subset of the 5-state region. A validation of this model has not been performed.
Datasets for the 5-state region are compressed and bundled with WinZip (.zip extension) for convenient download
Datasets for TNC ecoregions, individual states and counties are compressed using WinZip and have the .zip extension. Each file contains a folder with the dataset in ArcInfo grid or ERDAS imagine format as specified, FGDC metadata file(s) and a .pdf document of land cover class descriptions.
Landform Data
IMPORTANT DOWNLOAD INFO: To unzip .zip files, PC users will need to obtain a current version of WinZip (click here). When downloading files containing ArcInfo grids with a Windows operating system, the following is important when extracting with WinZip: 1) Extract with "use folder names" clicked "on", and 2) Extract the folder to a location on your hard drive such that the pathname does not contain spaces (e.g. do not put it on the desktop or under "Documents and Settings").
-
Landform clipped to State and County boundaries:
Download Scripts
Want to check the SWReGAP Map Server before downloading? Click Here