To use these functions, the Spatial Feature is required.
The spatial functions are based upon the JTS Topology Suite.
Notice, that JTS only considers x and y coordinate and ignores the z coordinate (although z can be definied)!
Transform the list of spatial polar coordinates into a list of Cartesian coordinates
Transforms a String in WKT to a Geometry in Odysseus. If you have x and y (i.e. Latitude and Longitude) in your data stream, you can use this function as follows to create a Geometry.
#PARSER PQL #QNAME VoyageStream #RUNQUERY proj = PROJECT({ATTRIBUTES = ['x', 'y', 'VoyageID']}, System.vesselVoyages) /// Use x and y to create a geo-object createWKTstring = MAP({EXPRESSIONS = [['"POINT (" + toString(x) + " " + toString(y) + ") "', 'wktString']]}, proj) createSpatialObject = MAP({EXPRESSIONS = [['FromWKT(wktString)', 'SpatialPoint']]}, createWKTstring) |
Returns the centroid of the given geometry
Creates a buffer of the given size around the given geometry
Checks whether the first geometry contains the second geometry.
Computes the smallest convex spatial polygon
that contains all the points in the geometry
Calculates the distance between the two points. The distance is given in degrees, as the function does not know anything about the used geodetic datum. Hence, it can be used without an SRID. Internally, the distance-function from the JTS is used.
/// Use x and y to create a geo-object createWKTstring = MAP({EXPRESSIONS = [['"POINT (" + toString(X) + " " + toString(Y) + ") "', 'wktString']]}, region1) createSpatialObject = MAP({EXPRESSIONS = [['FromWKT(wktString)', 'SpatialPoint']]}, createWKTstring) /// Set SRID for WGS84 setSRID = MAP({EXPRESSIONS = [['ST_SetSRID(SpatialPoint, 4326)', 'withSRID']]}, createSpatialObject) |
Transforms the given spatial polar coordinate into a spatial Cartesian coordinate.
Transforms the given spatial Cartesian coordinate into a polar coordinate