GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/pyproj_functions.py:86-107 (handler)

  The primary handler function for the 'get_crs_info' tool. It takes a CRS identifier as input and returns detailed information about the CRS using the pyproj library, including name, type, axis info, geographic/projected status, datum, ellipsoid, prime meridian, and area of use.

  @gis_mcp.tool()
  def get_crs_info(crs: str) -> Dict[str, Any]:
      """Get information about a CRS."""
      try:
          import pyproj
          crs_obj = pyproj.CRS(crs)
          return {
              "status": "success",
              "name": crs_obj.name,
              "type": crs_obj.type_name,
              "axis_info": [axis.direction for axis in crs_obj.axis_info],
              "is_geographic": crs_obj.is_geographic,
              "is_projected": crs_obj.is_projected,
              "datum": str(crs_obj.datum),
              "ellipsoid": str(crs_obj.ellipsoid),
              "prime_meridian": str(crs_obj.prime_meridian),
              "area_of_use": str(crs_obj.area_of_use) if crs_obj.area_of_use else None,
              "message": "CRS information retrieved successfully"
          }
      except Exception as e:
          logger.error(f"Error getting CRS info: {str(e)}")
          raise ValueError(f"Failed to get CRS info: {str(e)}")

• src/gis_mcp/pyproj_functions.py:19-30 (registration)

  MCP resource endpoint that lists the available CRS-related tool operations under 'gis://crs/info', explicitly including 'get_crs_info'.

  @gis_mcp.resource("gis://crs/info")
  def get_crs_info_operations() -> Dict[str, List[str]]:
      """List available CRS information operations."""
      return {
          "operations": [
              "get_crs_info",
              "get_available_crs",
              "get_utm_zone",
              "get_utm_crs",
              "get_geocentric_crs"
          ]
      }