Hi Even , thx for explanations. So its all ok. A.
2015-09-02 20:24 GMT+02:00 Even Rouault <[email protected]>: > Le mercredi 02 septembre 2015 20:08:47, Andrea Peri a écrit : >> Hi, >> >> I see the minimum and maximum retrieved using the gdalinfo -stas comand >> are quite different from the same minimum and maximum retireved using >> the API python function "GetDefaultHistogram" ? > > Andrea, > > The min and max values returned by GetDefaultHistogram() aren't necessarily > the min and max values of the pixel values of the raster, but of the selected > bounds for the buckets of the histogram. > > * @param pdfMin pointer to double value that will contain the lower bound of > the histogram. > * @param pdfMax pointer to double value that will contain the upper bound of > the histogram. > > In the case of a Byte raster, those bounds are hardcoded to be -0.5 and 255.5. > This is a speed optimization, as in the general case, for other datatypes, the > actual min & max values from statistics will be first computed, and then the > histogram. > > Even > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com -- ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù ----------------- _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
