309 ESRI Arc/Info Binary Grid Image (Raster) An Arc/Info binary grid is a proprietary raster GIS file format developed by ESRI. The grid defines geographic space as an array of equally sized square grid points arranged in rows and columns. Each grid point stores a numeric value that represents a geographic attribute such as elevation or surface slope. Each grid cell is referenced by its x,y coordinate. Text Little-endian (Intel) 1 Digital Preservation Department / The National Archives 02 Aug 2005 02 Dec 2010 x-fmt/218 PUID adf File extension 388 ESRI Arc/Info Binary Grid Raster File 1 Absolute from BOF 0 Little-endian 0000270AFFFF(FC14|FBF8)