The OGR Simple Features Library is a C++ open source library providing IO access to a variety of geometry vector file format. OGR is part of the Geospatial Data Abstraction Library (GDAL) which covers IO and processing functionality for geospatial raster data formats. GDAL/OGR is widely used in open source and closed source applications. Some of the key features are:

• Uniform access to a large set of geospatial raster formats (GeoTIFF, Erdas Imagine, SRTM, SDTS, ECW, MrSID, JPEG2000, DTED, NITF, ...)
• Uniform acces to a variety of vector formats (DWG, DXF, GML, ERSI (Shapefile, FileGDB, ArcSDE), KML, SVG, OCI, ...)
• Provides services for high performance image warping
• Query and manipulation of simple feature vector geometries using the embedded open source GEOS geometry library
• Generic coordinate transformation functionality within OGRSpatialReference