Bonjour,
Dans mon projet de cartographie, j'utilise la bibliothèque gdal via scripts bash.
Je géoréférence des PNG (524288 PNG) pour en obtenir des TIFF en suivant cette méthode :
PNG => gdal_translate + gdalwarp => TIFF
Précisément :
Je souhaite faire une modification du contenu de <ColorTable>[...]</ColorTable> des fichiers VRT mais il n'est pas possible de le faire en mode natif (visiblement).
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3 gdal_translate -of VRT -a_srs EPSG:4326 $F_BW_PNG $F_VRT -a_ullr $ULLR gdalwarp -s_srs EPSG:4326 -t_srs EPSG:3857 $F_VRT $F_TIFF
On m'a indiqué que sed pouvait répondre à ma demande.
# VRT original
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22 <VRTDataset rasterXSize="256" rasterYSize="256"> <SRS dataAxisToSRSAxisMapping="2,1">GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AXIS["Latitude",NORTH],AXIS["Longitude",EAST],AUTHORITY["EPSG","4326"]]</SRS> <GeoTransform> -1.8000000000000000e+02, 1.3732910156250000e-03, 0.0000000000000000e+00, 7.1718750000000000e+01, 0.0000000000000000e+00, -1.3732910156250000e-03</GeoTransform> <VRTRasterBand dataType="Byte" band="1"> <Metadata domain="IMAGE_STRUCTURE"> <MDI key="NBITS">1</MDI> </Metadata> <ColorInterp>Palette</ColorInterp> <ColorTable> <Entry c1="0" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="255" c3="255" c4="255" /> </ColorTable> <SimpleSource> <SourceFilename relativeToVRT="0">bw_png/map_11_0_52.png</SourceFilename> <SourceBand>1</SourceBand> <SourceProperties RasterXSize="256" RasterYSize="256" DataType="Byte" BlockXSize="256" BlockYSize="1" /> <SrcRect xOff="0" yOff="0" xSize="256" ySize="256" /> <DstRect xOff="0" yOff="0" xSize="256" ySize="256" /> </SimpleSource> </VRTRasterBand> </VRTDataset>
Ici je souhaite supprimer cette partie
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4 <Metadata domain="IMAGE_STRUCTURE"> <MDI key="NBITS">1</MDI> </Metadata>
et modifier celle ci
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5 <ColorTable> <Entry c1="0" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="255" c3="255" c4="255" /> </ColorTable>
en
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259 <ColorTable> <Entry c1="0" c2="0" c3="255" c4="255" /> <Entry c1="0" c2="255" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" 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c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> <Entry c1="255" c2="0" c3="0" c4="255" /> </ColorTable>
J'ai commencé a regarder sed mais c'est pas clair comme de l'eau de roche pour ma petite tête de serin ... un coup de pouce serait le bienvenu.
Merci
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