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77 lines
1.5 KiB
Markdown
77 lines
1.5 KiB
Markdown
# Raster Standards
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## Accepted V1 raster inputs
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- GeoTIFF preferred.
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- TIFF only if georeferencing metadata exists or sidecar world file is provided.
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- JPG/PNG only as non-georeferenced preview unless georeferencing is explicitly supplied.
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## Metadata required
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- width;
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- height;
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- band count;
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- dtype;
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- CRS;
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- transform;
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- bounds in source CRS;
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- bounds in EPSG:4326 where possible;
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- nodata value;
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- resolution;
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- file size;
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- checksum/hash.
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## Tile defaults
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- tile size: 512x512 pixels;
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- overlap: 64 pixels for detection/segmentation;
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- padding strategy: reflect or constant nodata, recorded in parameters;
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- tile IDs must be stable and reproducible.
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## Derived raster outputs
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Derived rasters must reference:
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- parent dataset;
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- operation;
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- parameters;
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- timestamp;
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- CRS;
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- nodata handling.
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## Raster statistics
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V1 statistics:
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- min;
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- max;
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- mean;
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- std where feasible;
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- nodata count;
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- histogram bins for display.
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## Reprojection
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Reprojection must not overwrite originals. It creates a derived dataset.
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## Clipping
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Raster clipping to Area creates a derived raster and stores the clipping geometry reference.
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## AI inference preparation
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Before inference:
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- dataset must be georeferenced;
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- CRS must be known;
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- transform must be available;
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- tiling parameters must be stored;
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- band selection must be explicit.
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## Non-goals for V1
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- perfect Sentinel processing pipeline;
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- cloud optimized GeoTIFF production;
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- large-scale distributed raster processing;
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- LiDAR-derived raster generation.
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