[gdal-dev] GDALComputeRasterMinMax and 'nodata value'.

[Michele Sanges]

Hi,

why the function GDALComputeRasterMinMax() computes the two values
taking in account also the 'nodata value'?

For example:

# gdalinfo E020N40.DEM

Driver: EHdr/ESRI .hdr Labelled
Files: E020N40.DEM
       E020N40.HDR
       E020N40.STX
       E020N40.PRJ
Size is 4800, 6000
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        TOWGS84[0,0,0,0,0,0,0],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9108"]],
    AXIS["Lat",NORTH],
    AXIS["Long",EAST],
    AUTHORITY["EPSG","4326"]]
Origin = (20.000000000000004,39.999999999999993)
Pixel Size = (0.008333333333330,-0.008333333333330)
Corner Coordinates:
Upper Left  (  20.0000000,  40.0000000) ( 20d 0'0.00"E, 40d 0'0.00"N)
Lower Left  (  20.0000000, -10.0000000) ( 20d 0'0.00"E, 10d 0'0.00"S)
Upper Right (  60.0000000,  40.0000000) ( 60d 0'0.00"E, 40d 0'0.00"N)
Lower Right (  60.0000000, -10.0000000) ( 60d 0'0.00"E, 10d 0'0.00"S)
Center      (  40.0000000,  15.0000000) ( 40d 0'0.00"E, 15d 0'0.00"N)
Band 1 Block=4800x1 Type=UInt16, ColorInterp=Undefined
  Min=-9999.000 Max=5825.000 
  Minimum=-9999.000, Maximum=5825.000, Mean=-2347.600, StdDev=4873.500
  NoData Value=-9999


Regards.
Michele