GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/pyproj_functions.py:291-322 (handler)

  The core handler function for the 'get_utm_crs' tool, decorated with @gis_mcp.tool(). It uses pyproj to query the UTM CRS info for the given lon/lat coordinates and returns the CRS string representation.
  @gis_mcp.tool() def get_utm_crs(coordinates: List[float]) -> Dict[str, Any]: """Get UTM CRS for given coordinates.""" try: import pyproj from pyproj.database import query_utm_crs_info lon, lat = coordinates crs_info_list = query_utm_crs_info( datum_name="WGS 84", # Use "WGS 84" with space as per standard area_of_interest=pyproj.aoi.AreaOfInterest( west_lon_degree=lon, south_lat_degree=lat, east_lon_degree=lon, north_lat_degree=lat ) ) if not crs_info_list: raise ValueError("No UTM CRS found for the given coordinates") # Create CRS from CRSInfo and get its string representation crs_obj = pyproj.CRS.from_authority(crs_info_list[0].auth_name, crs_info_list[0].code) crs_str = crs_obj.to_string() return { "status": "success", "crs": crs_str, "message": "UTM CRS retrieved successfully" } except Exception as e: logger.error(f"Error getting UTM CRS: {str(e)}") raise ValueError(f"Failed to get UTM CRS: {str(e)}")
• src/gis_mcp/pyproj_functions.py:19-30 (registration)

  MCP resource endpoint that lists 'get_utm_crs' among the available CRS information operations, serving as a tool directory.
  @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" ] }