QGIS » QGIS Application

Hi Richard, thanks for trying.

Elements of the Pixel format dropdown are chosen dynamically from metadata of each driver (using GDALGetMetadataItem( ) and look for GDAL_DMD_CREATIONDATATYPES), only if in metadata is nothing about supported pixel data types, it show you all GDAL supported pixel data formats.

It looks that there is some problem with that complex pixel data types, Raster Calculator write into the file, problem 'begin' during opening it :). It looks that gdalinfo has no problem with it. I tried save data using python plugin RasterCalc and there is same problem.

I will look at it more in deep.

Does QGIS support rastar data saved in complex pixel data types (eg CFloat32) at all?

I am asking, because I tried open file which I created using Raster Calculator (GeoTIFF,CFloat32) and opened it in Grass with success. And I also made GeoTIFF with CFloat32 pixel data format using Grass and I can't open it in QGIS (same warnings: "Warning: GDAL data type is not supported").

Can someone review the attached patch?

I tested it (see #4) and found some issues. But I cannot answer the question of Zdenek.

Maybe he (or we) can ask the question on the devlist? And then based on that he can do an updated patch?

The patch looks good and adds important functionality to the raster calculator.

There is however one problem with the patch. The GDAL doc says that the array passed to RasterIO for writing needs to have output type. With the patch, calcData is still hardcoded float*, even though the output type can be different:

float* calcData;
.....
GDALDataType pixelFormatDGT = GDALGetDataTypeByName( mOutputPixelFormat.toLocal8Bit().data() );
if ( GDALRasterIO( outputRasterBand, GF_Write, 0, i, mNumOutputColumns, 1, calcData, mNumOutputColumns, 1, pixelFormatDGT, 0, 0 ) != CE_None )

It would be great if you could improve that part of the patch.

Thanks, I will look at this (float* calcData;...).

But still I am not sure whether QGIS can read rastar data saved in complex pixel data types (eg CFloat32). I made one file using gdal_translate (gdal_translate -ot CFloat32 -of GTiff elevation.tif elevationGDAL_CFloat32.tif) and still I can't open it in QGIS.