Geocalculator

🚀 @zealgeo/mcp-geo-server

A geoprocessing tool server based on the Model Context Protocol (MCP), offering spatial analysis functions such as coordinate system conversion, distance calculation, and area calculation.

🚀 Quick Start

📦 Installation

"geo-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@zealgeo/mcp-geo-server"
      ]
    }

✨ Features

Coordinate System Conversion

It supports conversions between the following coordinate systems:

• BD09 (Baidu Coordinate System)
• GCJ02 (Mars Coordinate System)
• WGS84 (GPS Coordinate System)
• Web Mercator (Web Mercator Projection)

Supported conversion methods:

• Conversion between BD09 and GCJ02
• Conversion between WGS84 and GCJ02
• Conversion between BD09 and WGS84
• Conversion between Web Mercator and longitude-latitude

Spatial Calculation

• Calculate the distance of a polyline (supports meters and kilometers as units).
• Calculate the area of a polygon (supports square meters, square kilometers, and hectares as units).
• Supports input in multiple coordinate systems (WGS84, GCJ02, BD09).

📚 Documentation

MCP Tools

mcp_geo_convert

A coordinate system conversion tool that supports mutual conversion between BD09, GCJ02, WGS84, and Web Mercator.

Parameters:

• method: Conversion method
  • BD09toGCJ02: Convert from Baidu Coordinate System to Mars Coordinate System.
  • GCJ02toBD09: Convert from Mars Coordinate System to Baidu Coordinate System.
  • WGS84toGCJ02: Convert from WGS84 to Mars Coordinate System.
  • GCJ02toWGS84: Convert from Mars Coordinate System to WGS84.
  • BD09toWGS84: Convert from Baidu Coordinate System to WGS84.
  • WGS84toBD09: Convert from WGS84 to Baidu Coordinate System.
  • WebMercatortoLngLat: Convert from Web Mercator to longitude-latitude.
  • LngLattoWebMercator: Convert from longitude-latitude to Web Mercator.
• longitude: Longitude value.
• latitude: Latitude value.

mcp_geo_calculate_distance

Calculate the distance of a polyline. It calculates the planar distance based on the Web Mercator projection.

Parameters:

• coordinates: An array of polyline coordinate points [[lon1,lat1], [lon2,lat2],...].
• unit: Length unit (meters [default], kilometers).
• coordType: Input coordinate type (WGS84 [default], GCJ02, BD09).

mcp_geo_calculate_area

Calculate the area of a polygon. It calculates the planar area based on the Web Mercator projection.

Parameters:

• coordinates: An array of polygon coordinate points [[lon1,lat1], [lon2,lat2],...].
• unit: Area unit (square_meters [default], square_kilometers, hectares).
• coordType: Input coordinate type (WGS84 [default], GCJ02, BD09).

Coordinate System Explanation

BD09 (Baidu Coordinate System)

The coordinate system used by Baidu Maps, which is encrypted again based on GCJ02.

GCJ02 (Mars Coordinate System)

China's geographical coordinate system, used for storing and transmitting sensitive geographical location data.

WGS84 (GPS Coordinate System)

The international standard Earth coordinate system, widely used in global positioning and navigation.

Web Mercator (Web Mercator Projection)

A map projection method suitable for the spherical Earth, commonly used in online map services.

🔧 Important Note

• Handle coordinate system conversions with caution to avoid loss or offset of geographical location information.
• When using outside mainland China, please comply with local laws, regulations, and data security specifications.