These functions are used to handle geospatial data in map visualizations. Qlik Sense follows GeoJSON specifications for geospatial data and supports the following:
For more information on GeoJSON specifications, see:
Use the drop-down on each function to see a brief description and the syntax of each function. Click the function name in the syntax description for further details.
There are two categories of geospatial functions: aggregation and non-aggregation.
Aggregation functions take a geometry set (points or areas) as input, and return a single geometry. For example, multiple areas can be merged together, and a single boundary for the aggregation can be drawn on the map.
Non-aggregation function take a sinlge geometry and return one geometry. For example, for the function GeoGetPolygonCenter(), if the boundary geometry of one area is set as input, the point geometry (longitude and latitude) for the center of that area is returned.
The following are aggregation functions:
GeoAggrGeometry() is used to aggregate a number of areas into a larger area, for example aggregating a number of sub-regions to a region.
GeoBoundingBox() is used to aggregate a geometry into an area and calculate the smallest bounding box that contains all coordinates.
GeoCountVertex() is used to find the number of vertices a polygon geometry contains.
GeoInvProjectGeometry() is used to aggregate a geometry into an area and apply the inverse of a projection.
GeoProjectGeometry() is used to aggregate a geometry into an area and apply a projection.
GeoReduceGeometry() is used to reduce the number of vertices of a geometry, and to aggregate a number of areas into one area, but still displaying the boundary lines from the individual areas.
The following are non-aggregation functions:
GeoGetBoundingBox() is used in scripts and chart expressions to calculate the smallest geospatial bounding box that contains all coordinates of a geometry.
GeoGetPolygonCenter() is used in scripts and chart expressions to calculate and return the center point of a geometry.
GeoMakePoint() is used in scripts and chart expressions to create and tag a point with latitude and longitude.
GeoProject() is used in scripts and chart expressions to apply a projection to a geometry.