GIS image created by IDRISI Taiga, a GIS imaging application; stores a raster image, commonly representing the geographical terrain captured in an aerial photo via remote sensing techniques; used in the process of analyzing and visualizing spatial data.
RST files are saved with an accompanying .RDC file that describes the contents of the image. They may also include an .SMP color table file and a .REF geographic reference file.
NOTE: IDRIS raster images formerly used the ".img" extension. However, Clark Labs changed the extension so that the file type would not be confused with other file types that use the ".img" extension.