get_available_crs
Retrieve coordinate reference systems for geospatial analysis, enabling accurate coordinate transformations and spatial measurements in GIS operations.
Instructions
Get list of available CRS.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
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No arguments | |||
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
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No arguments | |||
Implementation Reference
- src/gis_mcp/pyproj_functions.py:109-152 (handler)The handler function for the 'get_available_crs' MCP tool. It fetches a list of available CRS from PyProj's EPSG database (limited to first 100 for performance), extracts name and type for each, with fallback to well-known CRS if none found.
@gis_mcp.tool() def get_available_crs() -> Dict[str, Any]: """Get list of available CRS.""" try: import pyproj from pyproj.database import get_codes from pyproj.enums import PJType crs_list = [] # Get a sample of common EPSG codes (limit to avoid huge lists) epsg_codes = list(get_codes("EPSG", PJType.CRS))[:100] # Limit to first 100 for performance for code in epsg_codes: try: # Directly create CRS and get info without calling the tool function crs_obj = pyproj.CRS.from_epsg(int(code)) crs_list.append({ "auth_name": "EPSG", "code": str(code), "name": crs_obj.name, "type": crs_obj.type_name }) except Exception as ex: # Skip invalid CRS codes logger.debug(f"Skipping EPSG:{code}: {str(ex)}") continue if not crs_list: # Fallback: return some well-known CRS well_known_crs = [ {"auth_name": "EPSG", "code": "4326", "name": "WGS 84", "type": "Geographic 2D CRS"}, {"auth_name": "EPSG", "code": "3857", "name": "WGS 84 / Pseudo-Mercator", "type": "Projected CRS"}, {"auth_name": "EPSG", "code": "4269", "name": "NAD83", "type": "Geographic 2D CRS"}, ] crs_list = well_known_crs return { "status": "success", "crs_list": crs_list, "message": "Available CRS list retrieved successfully" } except Exception as e: logger.error(f"Error getting available CRS: {str(e)}") raise ValueError(f"Failed to get available CRS: {str(e)}")