feat: add sparse GTiff fixtures - #70
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GDAL/rasterio support "sparse" tiled TIFFs (SPARSE_OK=YES): a tile the encoder never wrote has TileOffsets == TileByteCounts == 0. uint8_1band_sparse_nodata.tif has nodata=7 and only tile (0, 0) written; uint8_1band_sparse_no_nodata.tif is the same with no GDAL_NODATA tag. Written directly with the plain GTiff driver rather than write_utils.write_cog, since that helper's COG-driver copy step may not preserve sparseness.
This was referenced Sep 11, 2026
ljstrnadiii
marked this pull request as ready for review
September 11, 2026 20:11
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Summary
Adds two fixtures for sparse-tile support: a tile GDAL never writes has
TileOffsets == TileByteCounts == 0(TIFF6/COG sparse convention).rasterio_generated/fixtures/uint8_1band_sparse_nodata.tif— 512x512, single band, 2x2 tiles,GDAL_NODATA=7, only tile (0, 0) written.rasterio_generated/fixtures/uint8_1band_sparse_no_nodata.tif— same, noGDAL_NODATAtag, exercises the zero-fill default.Generated with plain
rasterio.open(driver="GTiff", sparse_ok=True, ...), notwrite_utils.write_cog— that helper's COG-driver copy may not preserve sparseness.pixi run generate+pixi run infoproduce no diff to any other fixture.Status
Ready for review. Blocks developmentseed/async-tiff#340 and developmentseed/async-geotiff#175 — merge in that order. CI is pending manual workflow approval (
action_required), not failing.Pre-merge checklist
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