GIS File Formats


Of course there’s no Open, widely adopted standard for map data. Here are dome of the file formats I’ve encountered:

.dem
Digital Elevation Models. “The USGS DEM standard is a geospatial file format developed by the United States Geological Survey for storing a digital elevation model (or surface elevation).”1

DOQs
Digital Orthophoto Quads

DRGs
Digital Raster Graphs. These can be viewed using the free version of ESRI’s ArcExplorer GIS.

.e00
an (ESRI) ArcInfo (aka ARC/INFO) interchange/export file.

.img
.img files register as Garmin MapSource Map.

.mp
.mp files are for some reason called Polish Format, at least by the folks at GPSMapEdit and MapCenter.

.shp
.shp files register as ESRI shapefiles. This seems to be one of the more common formats.

TIGER/Line File
Topologically Integrated Geographic Encoding and Referencing, or TIGER, or TIGER/Line is a format used by the United States Census Bureau to describe land attributes such as roads, buildings, rivers, and lakes.2

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