VRT: add a NoDataFromMaskSource source #9128
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hobu
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Jan 26, 2024
The NoDataFromMaskSource is derived from the SimpleSource and shares
the same properties except that it replaces the value of the source with
the value of the NODATA child element when the value of the mask band of
the source is less or equal to the MaskValueThreshold child element.
Also add a -nodata_if_mask_less_or_equal <threshol> option to
gdalbuildvrt
Example:
```
$ gdal_translate autotest/gcore/data/stefan_full_rgba.tif in.tif -a_srs EPSG:4326 -a_ullr -180 90 180 -90
$ gdalbuildvrt nodatafrommask.vrt in.tif -nodata_if_mask_less_or_equal 128 -vrtnodata 0
$ cat nodatafrommask.vrt
<VRTDataset rasterXSize="162" rasterYSize="150">
<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, 2.2222222222222223e+00, 0.0000000000000000e+00, 9.0000000000000000e+01, 0.0000000000000000e+00, -1.2000000000000000e+00</GeoTransform>
<VRTRasterBand dataType="Byte" band="1">
<NoDataValue>0</NoDataValue>
<ColorInterp>Red</ColorInterp>
<NoDataFromMaskSource>
<SourceFilename relativeToVRT="1">in.tif</SourceFilename>
<SourceBand>1</SourceBand>
<SourceProperties RasterXSize="162" RasterYSize="150" DataType="Byte" BlockXSize="162" BlockYSize="12" />
<SrcRect xOff="0" yOff="0" xSize="162" ySize="150" />
<DstRect xOff="0" yOff="0" xSize="162" ySize="150" />
<MaskValueThreshold>128</MaskValueThreshold>
<NODATA>0</NODATA>
</NoDataFromMaskSource>
</VRTRasterBand>
<VRTRasterBand dataType="Byte" band="2">
<NoDataValue>0</NoDataValue>
<ColorInterp>Green</ColorInterp>
<NoDataFromMaskSource>
<SourceFilename relativeToVRT="1">in.tif</SourceFilename>
<SourceBand>2</SourceBand>
<SourceProperties RasterXSize="162" RasterYSize="150" DataType="Byte" BlockXSize="162" BlockYSize="12" />
<SrcRect xOff="0" yOff="0" xSize="162" ySize="150" />
<DstRect xOff="0" yOff="0" xSize="162" ySize="150" />
<MaskValueThreshold>128</MaskValueThreshold>
<NODATA>0</NODATA>
</NoDataFromMaskSource>
</VRTRasterBand>
<VRTRasterBand dataType="Byte" band="3">
<NoDataValue>0</NoDataValue>
<ColorInterp>Blue</ColorInterp>
<NoDataFromMaskSource>
<SourceFilename relativeToVRT="1">in.tif</SourceFilename>
<SourceBand>3</SourceBand>
<SourceProperties RasterXSize="162" RasterYSize="150" DataType="Byte" BlockXSize="162" BlockYSize="12" />
<SrcRect xOff="0" yOff="0" xSize="162" ySize="150" />
<DstRect xOff="0" yOff="0" xSize="162" ySize="150" />
<MaskValueThreshold>128</MaskValueThreshold>
<NODATA>0</NODATA>
</NoDataFromMaskSource>
</VRTRasterBand>
</VRTDataset>
```
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@rcoup did you get a chance to test this PR? |
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The NoDataFromMaskSource is derived from the SimpleSource and shares the same properties except that it replaces the value of the source with the value of the NODATA child element when the value of the mask band of the source is less or equal to the MaskValueThreshold child element.
Also add a --nodata_max_mask_threshold option to gdalbuildvrt
Example: