Thanks Evan BUT
Firstly in my binaries-only install I don't see any .cpp files And secondly the other method (using VRTs) how would one then automate that (to do, say 1000 tiles in a script). The editing of the VRT would be the tricky part. ====================================== Michael Smith MS GISP State GIS Manager, Maine Office of GIS State of Maine, Office of Information Technology michael.smith _at_ maine.gov 207-215-5530 Board Member, Maine GeoLibrary Board Member, Maine GIS Users Group State Rep, National States Geographic Information Council | MEGIS | GeoLibrary | MEGUG | NSGIC | ***NOTE NEW ADDRESS*** State House Station 145 51 Commerce Drive Augusta, ME 04333-0145 69d 47' 58.9"W 44d 21' 54.8"N -----Original Message----- From: Even Rouault [mailto:even.roua...@mines-paris.org] Sent: Friday, December 14, 2012 1:48 PM To: gdal-dev@lists.osgeo.org Cc: Smith, Michael Subject: Re: [gdal-dev] how to gdalwarp 4-band orthoimagery Le vendredi 14 décembre 2012 19:17:07, Smith, Michael a écrit : > Seems like this is a straightforward issue but finding it difficult to > solve online. > > > > I have a new crop of 4-band orthoimages, as GeoTIFFs. I want to create > mosaics of some tiles. There is a slight pixel overlap at the edges. > When I run gdalwarp it always treats the 4th band as alpha, which causes > the overlap edges to be lighter than everything else in the mosaic, > creating an odd grid pattern were these edges were (when viewing the CIR > bands 4-1-2). > > > > How can I disable this treatment of the 4th band as alpha? gdal_translate src.tif tmp.vrt -of VRT and edit tmp.vrt to remove the <ColorInterp>Alpha</ColorInterp> on the 4th band or edit apps/gdalwarp.cpp and disable the following lines : /* -------------------------------------------------------------------- */ /* Do we have a source alpha band? */ /* -------------------------------------------------------------------- */ if( GDALGetRasterColorInterpretation( GDALGetRasterBand(hSrcDS,GDALGetRasterCount(hSrcDS)) ) == GCI_AlphaBand && !bEnableSrcAlpha ) { bEnableSrcAlpha = TRUE; if( !bQuiet ) printf( "Using band %d of source image as alpha.\n", GDALGetRasterCount(hSrcDS) ); } > > > > =============================== > Michael Smith MS GISP > State GIS Manager, Maine Office of GIS > State of Maine, Office of Information Technology > michael.smith _at_ maine.gov > 207-215-5530 > > Board Member, Maine GeoLibrary > Board Member, Maine GIS Users Group > State Rep, National States Geographic Information Council > [cid:image001.png@01CDD9FD.50D40D40][icons] > > ***NOTE NEW ADDRESS*** > > State House Station 145 > 51 Commerce Drive > Augusta, ME 04333-0145 > 69o 47' 58.9"W 44o 21' 54.8"N _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev