GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/shapely_functions.py:388-403 (handler)

  The core handler function for the 'unary_union_geometries' tool. It takes a list of WKT geometry strings, computes their unary union using Shapely's unary_union, and returns the resulting geometry as WKT in a success dictionary.

  @gis_mcp.tool()
  def unary_union_geometries(geometries: List[str]) -> Dict[str, Any]:
      """Create a union of multiple geometries."""
      try:
          from shapely import wkt
          from shapely.ops import unary_union
          geoms = [wkt.loads(g) for g in geometries]
          result = unary_union(geoms)
          return {
              "status": "success",
              "geometry": result.wkt,
              "message": "Union created successfully"
          }
      except Exception as e:
          logger.error(f"Error creating union: {str(e)}")
          raise ValueError(f"Failed to create union: {str(e)}")

• src/gis_mcp/shapely_functions.py:50-59 (registration)

  Registers 'unary_union_geometries' in the list of available advanced GIS operations accessible via the 'gis://operations/advanced' resource.

  @gis_mcp.resource("gis://operations/advanced")
  def get_advanced_operations() -> Dict[str, List[str]]:
      """List available advanced operations."""
      return {
          "operations": [
              "triangulate_geometry",
              "voronoi",
              "unary_union_geometries"
          ]
      }