mapchete.io.vector module¶
Functions handling vector data.
- mapchete.io.vector.clean_geometry_type(geometry, target_type, allow_multipart=True, raise_exception=True)¶
Return geometry of a specific type if possible.
Filters and splits up GeometryCollection into target types. This is necessary when after clipping and/or reprojecting the geometry types from source geometries change (i.e. a Polygon becomes a LineString or a LineString becomes Point) in some edge cases.
- Parameters
- geometry
shapely.geometry - target_typestring
target geometry type
- allow_multipartbool
allow multipart geometries (default: True)
- geometry
- Returns
- cleaned geometry
shapely.geometry returns None if input geometry type differs from target type
- cleaned geometry
- Raises
- GeometryTypeErrorif geometry type does not match target_type
- mapchete.io.vector.multipart_to_singleparts(geom)¶
Yield single part geometries if geom is multipart, otherwise yield geom.
- Parameters
- geomshapely geometry
- Returns
- shapely single part geometries
- mapchete.io.vector.reproject_geometry(geometry, src_crs=None, dst_crs=None, clip_to_crs_bounds=True, error_on_clip=False, segmentize_on_clip=False, segmentize=False, segmentize_fraction=100, validity_check=True, antimeridian_cutting=False, retry_with_clip=True)¶
Reproject a geometry to target CRS.
Also, clips geometry if it lies outside the destination CRS boundary. Supported destination CRSes for clipping: 4326 (WGS84), 3857 (Spherical Mercator) and 3035 (ETRS89 / ETRS-LAEA).
- Parameters
- geometry
shapely.geometry - src_crs
rasterio.crs.CRSor EPSG code CRS of source data
- dst_crs
rasterio.crs.CRSor EPSG code target CRS
- error_on_clipbool
raises a
RuntimeErrorif a geometry is outside of CRS bounds (default: False)- validity_checkbool
checks if reprojected geometry is valid and throws
TopologicalErrorif invalid (default: True)- clip_to_crs_boundsbool
Always clip geometries to CRS bounds. (default: True)
- antimeridian_cuttingbool
cut geometry at Antimeridian; can result in a multipart output geometry
- geometry
- Returns
- geometry
shapely.geometry
- geometry
- mapchete.io.vector.segmentize_geometry(geometry, segmentize_value)¶
Segmentize Polygon outer ring by segmentize value.
Just Polygon geometry type supported.
- Parameters
- geometry
shapely.geometry - segmentize_value: float
- geometry
- Returns
- geometry
shapely.geometry
- geometry
- mapchete.io.vector.to_shape(geom) shapely.geometry.base.BaseGeometry¶
Convert geometry to shapely geometry if necessary.
- Parameters
- geomshapely geometry or GeoJSON mapping
- Returns
- shapely geometry