CSISS (Center for Spatial Information Science and Systems) and GMU (George Mason University) offer almost 80 APIs that provide geospatial processing and analysis services. Most of these APIs are based on GRASS (Geographic Resources Analysis Support System), an open source image processing and geographic information system.
The majority of available services are for satellite image processing, raster image processing, raster map statistical analysis, and vector map processing. There are also a few miscellaneous services for tasks such as hydrological analysis and fire-spread simulation.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.