Many of the bounding polygons names in the merged file and the names of the individual files complement names of data subdirectories within the idxp7500 and idxptrmbr master directories, as the full extent of these datasets is comprised of multiple tiles of more limited extent. Other bounding extent titles will not have a subdirectory for the dataset as they exist solely as a single theme at the KeyRegion (maximum extent) level.
These extent polygons are not tiling or spatial indexes as they do not indicate how the data is subdivided and stored in the warehouse. Users are refered to the tiling indexes and associated metadata available on the KCGIS Spatial Data Catalog webpage at
This theme may be used in conjunction with the raster status indexes, raststat_7500.shp and raststat_trmbr.shp, which illustrate the availability of tiles in the raster library. The status indexes will show if a tile exists for a given dataset but the extent theme is required to determine if the full extent of a given tile contains valid data, i.e, useable imagery, elevation grid, landcover data.