BumiAtlas MCP

Germany: ALKIS parcels in Baden-Württemberg and Berlin

German cadastral parcels (Flurstücke) from the states' ALKIS open data, as tools an AI assistant can call: find a parcel by Gemeinde and number, address or coordinates, read its Gemarkung, land use and area, and see it on a map with its neighbours.

Server URL

Streamable HTTP with OAuth. The first time you connect, your client opens a browser window to sign in with Google; no API key needed.

https://bumiatlas.com/mcp/germany

Connect

Claude (claude.ai, desktop)

Settings → Connectors → Add custom connector, paste the URL, then Connect and sign in with Google.

Claude Code

claude mcp add --transport http bumiatlas-germany https://bumiatlas.com/mcp/germany

ChatGPT

Settings → Apps & Connectors → Advanced → Developer mode, then Create with the URL and OAuth authentication.

Cursor

in ~/.cursor/mcp.json

{
  "mcpServers": {
    "bumiatlas-germany": {
      "url": "https://bumiatlas.com/mcp/germany"
    }
  }
}

Tools

Tool names and descriptions are in English, which models understand best; your assistant still answers in your language.

DE_parcel_search

Find German Flurstücke (ALKIS, Baden-Württemberg and Berlin) by place and number, address, id, or location, with each parcel's whole record. query takes a Gemeinde or Berlin Bezirk with the Flurstück number ('Freudenberg 3491/3', 'Mitte 513'), coordinates as 'latitude, longitude' (e.g. 48.7758, 9.1829), or an ALKIS object id ('DEBWL0010008IrmLFL'). To search by Gemarkung, address or street (Baden-Württemberg), pass the Gemeinde as gemeinde and the Gemarkung and number ('Wagensteig 29/12') or the address ('Hauptstraße 219') as query; gemeinde alone lists its parcels, paged with offset. With coordinates it returns parcels containing the point (distance 0), then the nearest within `radius` metres, closest first. Each parcel has id, state, flsk, number, gemarkung, flur, gemeinde, gemeindeCode, kreis, regierungsbezirk, address, landUse (use and m² pairs), area (registered, m²), updated, mapArea and bbox. Set include_geometry for each boundary as GeoJSON (keep limit small). Use DE_parcel_image to see a parcel and its neighbours.

querystring: 'Freudenberg 3491/3', 'latitude, longitude', an ALKIS id, or with gemeinde a Gemarkung and number or an address
gemeindestring: Gemeinde or Berlin Bezirk name, to search a Gemarkung or address in it
radiusnumber: Search radius in metres around coordinates(default 25)
limitinteger: Maximum results(default 20)
offsetinteger: Skip this many matches of a number or name search, to page through them(default 0)
include_geometryboolean: Include each boundary as a GeoJSON MultiPolygon(default false)

DE_parcel_image

A map image centred on a German Flurstück (id, the ALKIS id from DE_parcel_search) or a point (query), with every parcel in view outlined and labelled with its Flurstück number, so you can see which parcel is where. The parcel passed as id is drawn in red with a larger label; a query point is a red dot. Returns the parcels in view as JSON (label, id, number, gemarkung, area in m²; labelled: false where its label didn't fit), then one JPEG per basemap. Basemaps: satellite (Esri World Imagery, often a few years old), hybrid (the same imagery with road and place names), streets and topo (Esri's street and topographic maps). Pass several to compare, e.g. ['satellite', 'streets'] to match buildings with street names. Parcel outlines are yellow on imagery and magenta on maps. Imagery is not always aligned with the cadastre: offsets of a few metres are possible. A scale bar is at bottom left. Labels are left off where they'd overlap; call again with a smaller radius to read them. Each image costs about as much context as 1,000 words, so ask for what you need.

idstring: ALKIS id (e.g. DEBWL0010008IrmLFL), drawn in red
querystring: 'latitude, longitude' to centre on instead of a parcel
radiusnumber: Metres from the centre to the image edge. Default: fits the parcel with a margin, or 80 m around a point
basemapsarray: One image per basemap(default ["satellite"])
sizeinteger: Image width and height in pixels(default 768)

Try asking

Which parcel is at 49.75154, 9.32471? What is it used for?
Look up Flurstück 3491/3 in Freudenberg.
Find the parcel at Hauptstraße 219 in Freudenberg.

About the data

Baden-Württemberg (~9M parcels) and Berlin (~400k) so far; other states aren't loaded.
A Flurstück is numbered within its Gemarkung (29/12). Search by Gemeinde (or Berlin Bezirk) and number, or name the Gemeinde to search a Gemarkung or address in it.
No owners: neither state publishes them.