Free Data Sources

Caveats on these lists.

US state sites  Country sites Key data

MICRODEM supports many types of data and  data formats.   Insure the files you download are in an acceptable format. Avoid ESRI e00 format and SPCS data if possible, and never get ERDAS Imagine data.

Some data sets consist of multiple files, and you must pick the correct file to open the data set.

General notes on downloading data.

Other indexes:

Data portals: Data

Planets and moons, imagery

Other data


Last revision 12/16/2017