MySQL does not yet implement the following GIS features:
-
Additional Metadata Views
OpenGIS specifications propose several additional metadata views. For example, a system view named
GEOMETRY_COLUMNScontains a description of geometry columns, one row for each geometry column in the database. -
The OpenGIS function
Length()onLineStringandMultiLineStringcurrently should be called in MySQL asGLength()The problem is that there is an existing SQL function
Length()that calculates the length of string values, and sometimes it is not possible to distinguish whether the function is called in a textual or spatial context. We need either to solve this somehow, or decide on another function name.