# Raster Standards

## Accepted V1 raster inputs

- GeoTIFF preferred.
- TIFF only if georeferencing metadata exists or sidecar world file is provided.
- JPG/PNG only as non-georeferenced preview unless georeferencing is explicitly supplied.

## Metadata required

- width;
- height;
- band count;
- dtype;
- CRS;
- transform;
- bounds in source CRS;
- bounds in EPSG:4326 where possible;
- nodata value;
- resolution;
- file size;
- checksum/hash.

## Tile defaults

- tile size: 512x512 pixels;
- overlap: 64 pixels for detection/segmentation;
- padding strategy: reflect or constant nodata, recorded in parameters;
- tile IDs must be stable and reproducible.

## Derived raster outputs

Derived rasters must reference:

- parent dataset;
- operation;
- parameters;
- timestamp;
- CRS;
- nodata handling.

## Raster statistics

V1 statistics:

- min;
- max;
- mean;
- std where feasible;
- nodata count;
- histogram bins for display.

## Reprojection

Reprojection must not overwrite originals. It creates a derived dataset.

## Clipping

Raster clipping to Area creates a derived raster and stores the clipping geometry reference.

## AI inference preparation

Before inference:

- dataset must be georeferenced;
- CRS must be known;
- transform must be available;
- tiling parameters must be stored;
- band selection must be explicit.

## Non-goals for V1

- perfect Sentinel processing pipeline;
- cloud optimized GeoTIFF production;
- large-scale distributed raster processing;
- LiDAR-derived raster generation.