Re: [gdal-dev] FW: Function - GDALCreatePansharpenedVRT
Hi, Can anyone provide me a flowchart of the methods to be used to actually access the pansharpened dataset and convert it into .tif? i.e. I would like to know how to move ahead after getting CE_NONE from GDALPansharpenProcessRegion method. Thanks & regards, Jidnyasa N -Original Message- From: Even Rouault [mailto:even.roua...@spatialys.com] Sent: Monday, October 17, 2016 7:44 PM To: Jidnyasa Nilange Cc: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] FW: Function - GDALCreatePansharpenedVRT Jidnyasa, Please let the list CC'ed (I've re-added it) > > Thanks for the reply. My doubt is if I am having only panchromatic and > multispectral files as an input how to generate pansharpening vrt > without using python script as I am trying to use only C++? Well 2 choices: 1) port https://svn.osgeo.org/gdal/trunk/gdal/swig/python/scripts/gdal_pansharpen.py to C++. That shouldn't be too hard. It mostly formats the XML of the VRT and finally pass it to GDALCreateCopy 2) or perhaps less cumbersome, use the lower level C++ pansharping API of alg/gdalpansharpen.h ( http://www.gdal.org/gdalpansharpen_8h.html ) Even > > Thanks & Regards, > Jidnyasa N > > -Original Message- > From: Even Rouault [mailto:even.roua...@spatialys.com] > Sent: Monday, October 17, 2016 2:40 PM > To: gdal-dev@lists.osgeo.org > Cc: Jidnyasa Nilange > Subject: Re: [gdal-dev] FW: Function - GDALCreatePansharpenedVRT > > Hi, > > > I am trying to use GDALCreatePansharpenedVRT > > function > > > > however I am not been able to interpret the argument const char * > > pszXML > > > > Which is explained as "Pansharpened VRT XML where > > > > elements have no explicit SourceFilename and SourceBand. The > > spectral bands in the XML will be assigned the successive values of > > the pahInputSpectralBands array. Must not be NULL." > > > > > > > > Can someone please explain me, if this function merely converts the > > pansharpened VRT XML to VRT dataset > > Yes > > > or does it actually pansharpens the > > image using multispectral and panchromatic inputs > > No, you have to read the content of the VRT dataset with GDAL > RasterIO() API or translate it to another format like GTiff with > GDALCreateCopy() for example. > > > . If the latter is true > > please let me know how to generate such an XML and what it should > > consist of. > > See also > http://www.gdal.org/gdal_vrttut.html#gdal_vrttut_pansharpen > > And also http://www.gdal.org/gdal_pansharpen.html if you don't need to > embed that in your program but just run as an external program. > > Even > > -- > Spatialys - Geospatial professional services http://www.spatialys.com -- Spatialys - Geospatial professional services http://www.spatialys.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] FW: Function - GDALCreatePansharpenedVRT
Jidnyasa, Please let the list CC'ed (I've re-added it) > > Thanks for the reply. My doubt is if I am having only panchromatic and > multispectral files as an input how to generate pansharpening vrt without > using python script as I am trying to use only C++? Well 2 choices: 1) port https://svn.osgeo.org/gdal/trunk/gdal/swig/python/scripts/gdal_pansharpen.py to C++. That shouldn't be too hard. It mostly formats the XML of the VRT and finally pass it to GDALCreateCopy 2) or perhaps less cumbersome, use the lower level C++ pansharping API of alg/gdalpansharpen.h ( http://www.gdal.org/gdalpansharpen_8h.html ) Even > > Thanks & Regards, > Jidnyasa N > > -Original Message- > From: Even Rouault [mailto:even.roua...@spatialys.com] > Sent: Monday, October 17, 2016 2:40 PM > To: gdal-dev@lists.osgeo.org > Cc: Jidnyasa Nilange > Subject: Re: [gdal-dev] FW: Function - GDALCreatePansharpenedVRT > > Hi, > > > I am trying to use GDALCreatePansharpenedVRT function > > > > however I am not been able to interpret the argument const char * > > pszXML > > > > Which is explained as "Pansharpened VRT XML where > > > > elements have no explicit SourceFilename and SourceBand. The spectral > > bands in the XML will be assigned the successive values of the > > pahInputSpectralBands array. Must not be NULL." > > > > > > > > Can someone please explain me, if this function merely converts the > > pansharpened VRT XML to VRT dataset > > Yes > > > or does it actually pansharpens the > > image using multispectral and panchromatic inputs > > No, you have to read the content of the VRT dataset with GDAL RasterIO() > API or translate it to another format like GTiff with GDALCreateCopy() for > example. > > > . If the latter is true > > please let me know how to generate such an XML and what it should > > consist of. > > See also > http://www.gdal.org/gdal_vrttut.html#gdal_vrttut_pansharpen > > And also http://www.gdal.org/gdal_pansharpen.html if you don't need to > embed that in your program but just run as an external program. > > Even > > -- > Spatialys - Geospatial professional services http://www.spatialys.com -- Spatialys - Geospatial professional services http://www.spatialys.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] FW: Function - GDALCreatePansharpenedVRT
Hi, > > I am trying to use GDALCreatePansharpenedVRT function > however I am not been able to interpret the argument const char * pszXML > > > > Which is explained as "Pansharpened VRT XML where elements > have no explicit SourceFilename and SourceBand. The spectral bands in the > XML will be assigned the successive values of the pahInputSpectralBands > array. Must not be NULL." > > > > Can someone please explain me, if this function merely converts the > pansharpened VRT XML to VRT dataset Yes > or does it actually pansharpens the > image using multispectral and panchromatic inputs No, you have to read the content of the VRT dataset with GDAL RasterIO() API or translate it to another format like GTiff with GDALCreateCopy() for example. > . If the latter is true > please let me know how to generate such an XML and what it should consist > of. See also http://www.gdal.org/gdal_vrttut.html#gdal_vrttut_pansharpen And also http://www.gdal.org/gdal_pansharpen.html if you don't need to embed that in your program but just run as an external program. Even -- Spatialys - Geospatial professional services http://www.spatialys.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
