1.. _raster.ida: 2 3================================================================================ 4IDA -- Image Display and Analysis 5================================================================================ 6 7.. shortname:: IDA 8 9.. built_in_by_default:: 10 11GDAL supports reading and writing IDA images with some limitations. IDA 12images are the image format of WinDisp 4. The files are always one band 13only of 8bit data. IDA files often have the extension .img though that 14is not required. 15 16Projection and georeferencing information is read though some 17projections (i.e. Meteosat, and Hammer-Aitoff) are not supported. When 18writing IDA files the projection must have a false easting and false 19northing of zero. The support coordinate systems in IDA are Geographic, 20Lambert Conformal Conic, Lambert Azimuth Equal Area, Albers Equal-Area 21Conic and Goodes Homolosine. 22 23IDA files typically contain values scaled to 8bit via a slope and 24offset. These are returned as the slope and offset values of the bands 25and they must be used if the data is to be rescaled to original raw 26values for analysis. 27 28NOTE: Implemented as ``gdal/frmts/raw/idadataset.cpp``. 29 30See Also: 31`WinDisp <http://www.fao.org/giews/english/windisp/windisp.htm>`__ 32 33Driver capabilities 34------------------- 35 36.. supports_createcopy:: 37 38.. supports_create:: 39 40.. supports_georeferencing:: 41 42.. supports_virtualio:: 43