feat: add keep_native_crs option to RasterioSource - #2331
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Adds a keep_native_crs parameter to RasterioSource and RasterioSourceConfig that preserves the input raster's native CRS for both image_crs and map_crs instead of defaulting map_crs to EPSG:4326. This eliminates precision loss from unnecessary CRS transformations and avoids edge artifacts at tile boundaries. Closes azavea#2323.
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Summary
Fixes #2323 — adds
keep_native_crsparameter toRasterioSourceandRasterioSourceConfigthat preserves the input raster's native CRS for bothimage_crsandmap_crs, instead of defaultingmap_crsto EPSG:4326.Motivation
When
RasterioSourcereads a raster with a projected CRS (e.g. EPSG:3857), theRasterioCRSTransformerdefaultsmap_crsto EPSG:4326 even when the image_crs is already a projected coordinate system. This causes:Changes
RasterioSource.__init__: Addedkeep_native_crs: bool = Falseparameter.RasterioSourceConfig: Addedkeep_native_crs: bool = Field(False).Backward Compatibility
Fully backward compatible.
keep_native_crs=False(default) preserves existing behavior.Closes #2323.