Geometry primitivesFree tier

geometry_ops

PostGIS unary and binary operations on user-supplied WKT. Unary: buffer (with distance_m), simplify, centroid, envelope, convex_hull. Binary: intersection, union, difference. Returns the result WKT plus geometry type and area/length metrics. SRID restricted to a curated allowlist.

Use cases

Buffer a property location by 500m to derive a search polygon.
Simplify a heavy WKT polygon before sending it to a downstream tool.
Compute the intersection of two custom polygons (e.g., flood + admin boundary).
Get the convex hull of a cluster of points generated upstream.

Arguments

Name	Type	Required	Description
op	string	required	`buffer` \| `simplify` \| `centroid` \| `envelope` \| `convex_hull` \| `intersection` \| `union` \| `difference`.
geom_a	string	required	Input WKT geometry.
geom_b	string	optional	Second geometry for binary ops.
distance_m	number	optional	Buffer distance. Required for `buffer`. Max 50,000 m.
tolerance	number	optional	Simplify tolerance. Required for `simplify`. Max 1.0.
srid	integer	optional	Coordinate system. Allowlist: 4326, 3857, 3003, 3004, 4258, 6707, 6708, 32632, 32633. Default 4326.

Example request

curl

bash

curl -X POST https://mcp.qubitdata.it/mcp \
  -H "Authorization: Bearer $QUBITDATA_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "geometry_ops",
      "arguments": {
            "op": "buffer",
            "geom_a": "POINT(9.19 45.4642)",
            "distance_m": 500,
            "srid": 4326
      }
    }
  }'

Example response

JSON-RPC 2.0 result

json

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [
      {
        "type": "text",
        "text": "{\n  \"wkt\": \"POLYGON((9.1964 45.4642, 9.1962 45.4598, ...))\",\n  \"type\": \"Polygon\",\n  \"area_m2\": 785398\n}"
      }
    ]
  }
}

Prompts to try

Drop these into Claude Desktop, Cursor, or any MCP-aware client wired to https://mcp.qubitdata.it/mcp.

Claude Desktop

Buffer POINT(9.19 45.4642) by 500m and return WKT.
Cursor

Compute the convex hull of the point cluster I'll pass as MULTIPOINT WKT.
Custom MCP client

Simplify this heavy polygon to tolerance 0.0001 before passing it on.

Get started

Last updated: 2026-05-04