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<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
Dear subscribers</div>
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<br>
</div>
<div class="elementToProof" style="margin-top: 1em; margin-bottom: 1em; font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
I'm exploring the use of a VRT to mosaic raster tiles while also applying a mask layer using separate mask tiles.</div>
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Below is a VRT I created to test this approach:</div>
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<br>
</div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<VRTDataset rasterXSize="90" rasterYSize="90"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<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></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<GeoTransform> 0.0000000000000000e+00, 1.0000000000000000e+00, 0.0000000000000000e+00, 9.0000000000000000e+01, 0.0000000000000000e+00, -1.0000000000000000e+00</GeoTransform></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<VRTRasterBand dataType="Float32" band="1"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NoDataValue>-99</NoDataValue></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<ColorInterp>Gray</ColorInterp></div>
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<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_00.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
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<DstRect xOff="0" yOff="60" xSize="30" ySize="30" /></div>
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<NODATA>-99</NODATA></div>
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</SimpleSource></div>
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<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_01.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="0" yOff="30" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
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</SimpleSource></div>
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<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_02.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_10.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="30" yOff="60" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_11.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="30" yOff="30" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_12.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="30" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_20.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="60" yOff="60" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_21.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="60" yOff="30" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource resampling="nearest"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">tile_22.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceProperties RasterXSize="30" RasterYSize="30" DataType="Float32" BlockXSize="30" BlockYSize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="60" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NODATA>-99</NODATA></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</VRTRasterBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<MaskBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<VRTRasterBand dataType="Byte"></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<NoDataValue>0</NoDataValue></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">mask_m11.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="30" yOff="30" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">mask_m12.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="30" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">mask_m21.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="60" yOff="30" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceFilename relativeToVRT="1">mask_m22.tif</SourceFilename></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SourceBand>1</SourceBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<SrcRect xOff="0" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<DstRect xOff="60" yOff="0" xSize="30" ySize="30" /></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</SimpleSource></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</VRTRasterBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</MaskBand></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
</VRTDataset></div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="margin-top: 1em; margin-bottom: 1em; font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
This VRT consists of nine 30 × 30 pixel raster tiles arranged in a 3 × 3 grid, with a mask layer composed of four tiles.</div>
<div class="elementToProof" style="margin-top: 1em; margin-bottom: 1em; font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
When I display the VRT in QGIS, only those raster tiles that intersect the mask tiles are visible. Similarly, when querying the masked VRT using a Python script using a GDAL dataset, a GDAL band, and a NumPy masked array, I retrieve data only from tiles that
overlap the mask tiles.</div>
<div class="elementToProof" style="margin-top: 1em; margin-bottom: 1em; font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
My question is: Do I need to provide mask tiles covering the entire extent of the raster mosaic, or is there an alternative approach that allows me to use mask tiles only where I want to mask specific areas (e.g., to reduce redundancy)?</div>
<div class="elementToProof" style="margin-top: 1em; margin-bottom: 1em; font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
I’d appreciate any guidance or advice.</div>
<div class="elementToProof" style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
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Many thanks in advance of any guidance or advice any can provide, best wishes, Simon.</div>
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<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: Arial, sans-serif; color: rgb(246, 161, 36);"><b> </b></span></p>
<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: Arial, sans-serif; color: rgb(246, 161, 36);"><b>Simon Wright</b></span></p>
<p style="margin: 0cm; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: Arial, sans-serif; color: rgb(74, 74, 73);"><b>GISMO Scrum Master and RML Head of Software</b></span></p>
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