On 11-06-17 03:23 PM, Paul Mallas wrote:
Hello,
I am trying to transpose image data (i.e., swap lines and columns) and am
struggling to make it work properly. I think this should be possible through
RasterIO, but so far no luck. Any suggestions?
My approach so far has been like this, with image nXsize by nYsize:
void *pData = VSIMalloc2(nXSize, (GDALGetDataTypeSize(eType) / 8));
for (int iLine = 0; iLine < nYSize; iLine++) {
// Read in row (line)
eErr = poSrcBand->RasterIO(GF_Read, 0, iLine, nXSize, 1, pData,
nXSize, 1, eType, 0,0);
// Now I want to write a column, nothing I tried here has worked
eErr = poDstBand->RasterIO(GF_Write, .......
Paul,
You should be able to write this column wise like:
poDstBand->RasterIO( GF_Write, iLine, 0, 1, nXSize,
pData, 1, nXSize, eType, 0, 0 );
Note that this can be pretty inefficient depending on the format and
how it is blocked.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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