Geometric Object Base

The GeometricObject provides common methods for generating visualizations for geometry type objects. All objects that contain geometry fields inherit from this base class.

class gsshapy.base.GeometricObjectBase

Abstract base class for geometric objects.

tableName = None

Name of the table that the geometry column belongs to

id = None

ID of the record with the geometry column in the table that will be retrieved

geometryColumnName = None

Name of the geometry column

getAsKml(session)

Retrieve the geometry in KML format.

This method is a veneer for an SQL query that calls the ST_AsKml() function on the geometry column.

Parameters:session (sqlalchemy.orm.session.Session) – SQLAlchemy session object bound to PostGIS enabled database. Returns:KML string representation of geometry. Return type:str

getAsWkt(session)

Retrieve the geometry in Well Known Text format.

This method is a veneer for an SQL query that calls the ST_AsText() function on the geometry column.

Parameters:session (sqlalchemy.orm.session.Session) – SQLAlchemy session object bound to PostGIS enabled database. Returns:Well Known Text string representation of geometry. Return type:str

getAsGeoJson(session)

Retrieve the geometry in GeoJSON format.

This method is a veneer for an SQL query that calls the ST_AsGeoJSON() function on the geometry column.

Parameters:session (sqlalchemy.orm.session.Session) – SQLAlchemy session object bound to PostGIS enabled database. Returns:GeoJSON string representation of geometry. Return type:str

getSpatialReferenceId(session)

Retrieve the spatial reference id by which the geometry column is registered.

This method is a veneer for an SQL query that calls the ST_SRID() function on the geometry column.

Parameters:session (sqlalchemy.orm.session.Session) – SQLAlchemy session object bound to PostGIS enabled database. Returns:PostGIS spatial reference ID. Return type:str