_metadata.json : add GDAL command to generate RGB display

[davidoesch]

Is your feature request related to a problem? Please describe.
There is a need to add a field with a GDAL command to each _metadata.json file as for the gdal enhancement function, so BGDI can use this info to generate VRT see https://jira.swisstopo.ch/browse/BGDIDIC-2772

Describe the solution you'd like
A field should be added to each _metadata.json file for the _10m band containing the GDAL command: gdal_translate /vsicurl/https://data.geo.admin.ch/ch.swisstopo.swisseo_s2-sr_v100/2024-03-19t102639/ch.swisstopo.swisseo_s2-sr_v100_mosaic_2024-03-19t102639_bands-10m.tif gdal_translate_byte.vrt -a_nodata 9999 -scale -exponent 0.5 -of VRT. having -a_nodata 9999 and https://data.geo.admin.ch/ch.swisstopo.swisseo_s2-sr_v100/2024-03-19t102639/ch.swisstopo.swisseo_s2-sr_v100_mosaic_2024-03-19t102639_bands-10m.tif changed according to the file

Describe alternatives you've considered
Currently FSDI is generating the VRT files for each file and stores it internally

Additional context
Once this implemented, KOGIS will use the provided command and as fallback their json

[davidoesch]

maybe even try generate the VRT conent and store it in the json: more complex band math could be applied and the real TRUE COLOR result achieved:

Start with
<VRTDataset rasterXSize="29120" rasterYSize="22643"> <SRS dataAxisToSRSAxisMapping="1,2">PROJCS["CH1903+ / LV95",GEOGCS["CH1903+",DATUM["CH1903+",SPHEROID["Bessel 1841",6377397.155,299.1528128,AUTHORITY["EPSG","7004"]],AUTHORITY["EPSG","6150"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4150"]],PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",46.9524055555556],PARAMETER["longitude_of_center",7.43958333333333],PARAMETER["azimuth",90],PARAMETER["rectified_grid_angle",90],PARAMETER["scale_factor",1],PARAMETER["false_easting",2600000],PARAMETER["false_northing",1200000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2056"]]</SRS> <GeoTransform> 2.4744300000000000e+06, 1.0000000000000000e+01, 0.0000000000000000e+00, 1.3032400000000000e+06, 0.0000000000000000e+00, -1.0000000000000000e+01</GeoTransform> <Metadata> <MDI key="AREA_OR_POINT">Area</MDI> </Metadata> <Metadata domain="IMAGE_STRUCTURE"> <MDI key="COMPRESSION">DEFLATE</MDI> <MDI key="INTERLEAVE">PIXEL</MDI> </Metadata> <VRTRasterBand dataType="UInt16" band="1" blockXSize="512" blockYSize="512"> <NoDataValue>9999</NoDataValue> <ColorInterp>Gray</ColorInterp> <ComplexSource> <SourceFilename relativeToVRT="0">/vsicurl/https://data.geo.admin.ch/ch.swisstopo.swisseo_s2-sr_v100/2024-03-19t102639/ch.swisstopo.swisseo_s2-sr_v100_mosaic_2024-03-19t102639_bands-10m.tif</SourceFilename> <SourceBand>1</SourceBand> <SourceProperties RasterXSize="29120" RasterYSize="22643" DataType="UInt16" BlockXSize="512" BlockYSize="512" /> <SrcRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <DstRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <NODATA>9999</NODATA> <Exponent>0.5</Exponent> <SrcMin>0</SrcMin> <SrcMax>12964</SrcMax> <DstMin>0</DstMin> <DstMax>255</DstMax> </ComplexSource> </VRTRasterBand> <VRTRasterBand dataType="UInt16" band="2" blockXSize="512" blockYSize="512"> <NoDataValue>9999</NoDataValue> <ComplexSource> <SourceFilename relativeToVRT="0">/vsicurl/https://data.geo.admin.ch/ch.swisstopo.swisseo_s2-sr_v100/2024-03-19t102639/ch.swisstopo.swisseo_s2-sr_v100_mosaic_2024-03-19t102639_bands-10m.tif</SourceFilename> <SourceBand>2</SourceBand> <SourceProperties RasterXSize="29120" RasterYSize="22643" DataType="UInt16" BlockXSize="512" BlockYSize="512" /> <SrcRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <DstRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <NODATA>9999</NODATA> <Exponent>0.5</Exponent> <SrcMin>0</SrcMin> <SrcMax>13200</SrcMax> <DstMin>0</DstMin> <DstMax>255</DstMax> </ComplexSource> </VRTRasterBand> <VRTRasterBand dataType="UInt16" band="3" blockXSize="512" blockYSize="512"> <NoDataValue>9999</NoDataValue> <ComplexSource> <SourceFilename relativeToVRT="0">/vsicurl/https://data.geo.admin.ch/ch.swisstopo.swisseo_s2-sr_v100/2024-03-19t102639/ch.swisstopo.swisseo_s2-sr_v100_mosaic_2024-03-19t102639_bands-10m.tif</SourceFilename> <SourceBand>3</SourceBand> <SourceProperties RasterXSize="29120" RasterYSize="22643" DataType="UInt16" BlockXSize="512" BlockYSize="512" /> <SrcRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <DstRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <NODATA>9999</NODATA> <Exponent>0.5</Exponent> <SrcMin>0</SrcMin> <SrcMax>13556</SrcMax> <DstMin>0</DstMin> <DstMax>255</DstMax> </ComplexSource> </VRTRasterBand> <VRTRasterBand dataType="UInt16" band="4" blockXSize="512" blockYSize="512"> <NoDataValue>9999</NoDataValue> <ComplexSource> <SourceFilename relativeToVRT="0">/vsicurl/https://data.geo.admin.ch/ch.swisstopo.swisseo_s2-sr_v100/2024-03-19t102639/ch.swisstopo.swisseo_s2-sr_v100_mosaic_2024-03-19t102639_bands-10m.tif</SourceFilename> <SourceBand>4</SourceBand> <SourceProperties RasterXSize="29120" RasterYSize="22643" DataType="UInt16" BlockXSize="512" BlockYSize="512" /> <SrcRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <DstRect xOff="0" yOff="0" xSize="29120" ySize="22643" /> <NODATA>9999</NODATA> <Exponent>0.5</Exponent> <SrcMin>0</SrcMin> <SrcMax>12625</SrcMax> <DstMin>0</DstMin> <DstMax>255</DstMax> </ComplexSource> </VRTRasterBand> </VRTDataset>

[davidoesch]

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