CD Contents: Nebraska_PMP_Maps - Contains 40 ESRI .mxd ArcMap project files for each PMP Area-Duration.* Elevation - Contains a 90-meter Digital Elevation Model (DEM) raster in ESRI GRID format and a corresponding hillshade raster. Shapefiles - Contains an ESRI shapefile for each of the 40 PMP Area-Duration contours. Also contains shapefiles for all other background layers used in the .mxd map projects. raster - Contains the raster files for the 40 PMP Area-Durations in ESRI GRID format. * requires ESRI ArcMap 9.1 or later.