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