GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/pyproj_functions.py:44-62 (handler)

  The core handler function for the 'transform_coordinates' MCP tool. It takes a list of two floats (x,y), source CRS string, target CRS string, creates a pyproj Transformer, transforms the point, and returns a dict with the result.

  @gis_mcp.tool()
  def transform_coordinates(coordinates: List[float], source_crs: str, 
                          target_crs: str) -> Dict[str, Any]:
      """Transform coordinates between CRS."""
      try:
          from pyproj import Transformer
          transformer = Transformer.from_crs(source_crs, target_crs, always_xy=True)
          x, y = coordinates
          x_transformed, y_transformed = transformer.transform(x, y)
          return {
              "status": "success",
              "coordinates": [x_transformed, y_transformed],
              "source_crs": source_crs,
              "target_crs": target_crs,
              "message": "Coordinates transformed successfully"
          }
      except Exception as e:
          logger.error(f"Error transforming coordinates: {str(e)}")
          raise ValueError(f"Failed to transform coordinates: {str(e)}")