Elements

class geoalchemy2.elements.WKTElement(data, srid=-1, extended=False)

Bases: geoalchemy2.elements._SpatialElement

Instances of this class wrap a WKT or EWKT value.

Usage examples:

wkt_element_1 = WKTElement('POINT(5 45)')
wkt_element_2 = WKTElement('POINT(5 45)', srid=4326)
wkt_element_3 = WKTElement('SRID=4326;POINT(5 45)', extended=True)

desc

This element’s description string.

geom_from = 'ST_GeomFromText'

geom_from_extended_version = 'ST_GeomFromEWKT'

class geoalchemy2.elements.WKBElement(data, srid=-1, extended=False)

Bases: geoalchemy2.elements._SpatialElement

Instances of this class wrap a WKB or EWKB value.

Geometry values read from the database are converted to instances of this type. In most cases you won’t need to create WKBElement instances yourself.

If extended is True and srid is -1 at construction time then the SRID will be read from the EWKB data.

Note: you can create WKBElement objects from Shapely geometries using the geoalchemy2.shape.from_shape() function.

desc

This element’s description string.

geom_from = 'ST_GeomFromWKB'

geom_from_extended_version = 'ST_GeomFromEWKB'

class geoalchemy2.elements.RasterElement(data)

Bases: geoalchemy2.elements._SpatialElement

Instances of this class wrap a raster value. Raster values read from the database are converted to instances of this type. In most cases you won’t need to create RasterElement instances yourself.

desc

This element’s description string.