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mkdocs/docs/dev/rfc-geospatial-types.md

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@@ -13,13 +13,15 @@ This RFC describes the design and implementation of these types in PyIceberg.
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## Scope
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**In scope:**
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- `geometry(C)` and `geography(C, A)` primitive type definitions
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- Type parsing and serialization (round-trip support)
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- Avro mapping (WKB bytes)
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- PyArrow/Parquet conversion (with version-aware fallback)
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- Format version enforcement (v3 required)
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**Out of scope (future work):**
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- Spatial predicate pushdown (e.g., ST_Contains, ST_Intersects)
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- WKB/WKT conversion (requires external dependencies)
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- Geometry/geography bounds metrics
@@ -36,9 +38,11 @@ This RFC describes the design and implementation of these types in PyIceberg.
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### Type Parameters
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**GeometryType:**
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- `crs` (string): Coordinate Reference System, defaults to `"OGC:CRS84"`
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**GeographyType:**
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- `crs` (string): Coordinate Reference System, defaults to `"OGC:CRS84"`
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- `algorithm` (string): Geographic algorithm, defaults to `"spherical"`
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@@ -74,11 +78,13 @@ Both geometry and geography types map to Avro `bytes` type, consistent with `Bin
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### PyArrow/Parquet Mapping
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**With geoarrow-pyarrow installed:**
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- Geometry types convert to GeoArrow WKB extension type with CRS metadata
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- Geography types convert to GeoArrow WKB extension type with CRS and edge type metadata
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- Uses `geoarrow.pyarrow.wkb().with_crs()` and `.with_edge_type()` for full GeoArrow compatibility
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**Without geoarrow-pyarrow:**
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- Geometry and geography types fall back to `pa.large_binary()`
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- This provides WKB storage without GEO logical type metadata
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@@ -101,9 +107,11 @@ None. These are new types that do not affect existing functionality.
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## Dependency/Versioning
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**Required:**
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- PyIceberg core (no new dependencies)
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**Optional for full functionality:**
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- PyArrow 21.0.0+ for native Parquet GEO logical types
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## Testing Strategy

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