[gdal-dev] gdalbuilvrt segmentation fault

[Marco Nicoletti]

Dear all,

I have got a problem using the GDAL tool gdalbuildvrt.

I would like to join two DEMs sampled on the same grid which insist on the same 
geografical zone. 
The first DEM has got some NoDataValue holes and I would like to feel them with 
the values in
the second DEM. 
I ave used also the flag to ignore the projection 
(-allow_projection_difference).

DEMs have the same raster size (xSize=10801 ySize=7201), the same data type 
(Float32)
and the same NoData Value (-3.276700E+04).

The GDAL tool goes in segmentation fault: any ideas?

$ gdalbuildvrt -allow_projection_difference  output.vrt ned/safod+egm96.dem 
srtm/srtm_90m_egm96_grid.tif
0...10...20...30...40...50...60...70...80...90...100 - done.
Warning 6: gdalbuildvrt does not support heterogenous band characteristics. 
Skipping srtm/srtm_90m_egm96_grid.tif
Segmentation fault


Thanks in advanced.

Marco___
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[gdal-dev] Problems in setting PixelFunctionType and SourceTransferType in VRTDerivedRasterBand

[Marco Nicoletti]

This is a problem which regards all the gdal versions and is about the Python
GDAL bindings.

It seems to be impossible to setup PixelFunctionType and SourceTransferType
in VRTDerivedRasterBand from Python Gdal.

This is an example using IPython:
In [20]: vrtdriver = gdal.GetDriverByName('VRT')
In [21]: vrtdset = vrtdriver.Create('vrtdset.vrt', 1000, 1000, 0)
In [22]: vrtdset.AddBand(gdal.GetDataTypeByName('Float32'),
options=['subClass=VRTDerivedRasterBand', 'PixelFunctionType=phase',
'SourceTransferType=CFloat64'])
Out[22]: 0
In[23]: vrtdset.FlushCache()

Once these commands are run, the output file vrtdataset.vrt does not contain
the element PixelFunctionType in its VRTDerivedRasterBand :
VRTDataset rasterXSize=1000 rasterYSize=1000
VRTRasterBand dataType=Float32 band=1
subClass=VRTDerivedRasterBand/
/VRTDataset

On the contrary we would expect this result:
VRTDataset rasterXSize=1000 rasterYSize=1000
VRTRasterBand dataType=Float32 band=1
subClass=VRTDerivedRasterBand
   PixelFunctionTypephase/PixelFunctionType
   SourceTransferTypeCFloat64/SourceTransferType
/VRTRasterBand
/VRTDataset

Of course we have omitted the part concerning the Source Dataset.




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