getExtent
GetExtent is a common function in software libraries that manage spatial data, used to obtain the bounding extent of a dataset, layer, or feature collection. The extent, often described as a bounding box, defines the minimum rectangle that contains all geographic features in a given coordinate reference system. The function typically returns an envelope or extent object with coordinates such as minX, minY, maxX, and maxY, and may also include the associated spatial reference.
The exact behavior and return type of GetExtent vary by library. For vector data, the extent is
If a dataset is empty or contains no valid coordinates, GetExtent may return a null or empty
Uses of GetExtent include initializing map viewports, performing spatial queries, and guiding rendering and indexing decisions.