mapsql-mcp

Ask your PostGIS or Oracle Spatial database questions in plain English and get the answer back as a map.

mapsql-mcp is a Model Context Protocol server that lets AI assistants (Claude Desktop, Claude Code, Cursor, and any other MCP client) explore, query and analyse a PostGIS or an Oracle Spatial (SDO_GEOMETRY) database safely and answer with maps rendered right in the chat.

"Which pharmacies are within 500 m of Kızılay square?" - the model discovers the layers, calls within_distance (geodesic metres, whatever the table's SRID), then render_map. The picture above is the literal output of those two tool calls on the bundled demo database.

The GIF is built by scripts/make_demo_video.py from real tool outputs on the demo databases (PostGIS and Oracle).

Türkçe: kullanım kılavuzu aşağıda · Who is it for / step-by-step: Usage

Why another PostGIS / Postgres / Oracle MCP server?

Generic Postgres or Oracle MCP servers are not spatial-aware: the model has to hand-write PostGIS / SDO_* SQL and gets SRIDs, geography casts, units and ST_DWithin / SDO_WITHIN_DISTANCE arguments wrong in subtle ways, then cannot show the result. mapsql-mcp is built around three ideas:

1. Safe by construction. Every query is parsed (PostgreSQL: the real PostgreSQL parser; Oracle: sqlglot in Oracle mode), runs in a READ ONLY transaction with a timeout and a row cap, and secrets never reach the model. Writes are off unless you ask for them (PostGIS only).

2. Spatial tools instead of SQL guessing. within_distance, nearest, buffer, spatial_filter, spatial_join, aggregate, bbox_of ... take care of SRIDs, metric units and indexes - the same 14 tools on both databases. Plain run_sql is still there.

3. Answers are maps. render_map returns a PNG (OpenStreetMap basemap, choropleths, labels) as MCP image content and can also write an interactive Leaflet HTML file.

And the model is told to ask instead of guess: the server instructions, a prompt and the tools themselves refuse to proceed on "pharmacies nearby" (nearby what?) or on a place name that matches ten features.

Related MCP server: PostGIS Yukon MCP

Quickstart

Requires Python 3.10+ and a PostGIS or Oracle Spatial database. Use a read-only database role / user (see SECURITY.md). The backend is chosen from the connection string.

pip install mapsql-mcp            # or: pipx install mapsql-mcp   |   uvx mapsql-mcp
export DATABASE_URL=postgresql://readonly:secret@localhost:5432/gis
mapsql-mcp --check                # prints PostgreSQL/PostGIS versions and exits

# Oracle Spatial instead (python-oracledb thin mode: no Oracle Client install needed) - see "Oracle Spatial" below
pip install "mapsql-mcp[oracle]"
export DATABASE_URL="oracle://MAPSQL_RO:secret@dbhost:1521/ORCLPDB1"
mapsql-mcp --check

Claude Desktop

Edit claude_desktop_config.json (macOS ~/Library/Application Support/Claude/, Windows %APPDATA%\Claude\):

{
  "mcpServers": {
    "postgis": {
      "command": "uvx",
      "args": ["mapsql-mcp"],
      "env": { "DATABASE_URL": "postgresql://readonly:secret@localhost:5432/gis" }
    }
  }
}

Claude Code

claude mcp add postgis -e DATABASE_URL=postgresql://readonly:secret@localhost:5432/gis -- uvx mapsql-mcp

Cursor (.cursor/mcp.json) / Windsurf

{
  "mcpServers": {
    "postgis": {
      "command": "uvx",
      "args": ["mapsql-mcp", "--schemas", "public,osm"],
      "env": { "DATABASE_URL": "postgresql://readonly:secret@localhost:5432/gis" }
    }
  }
}

VS Code (.vscode/mcp.json, Copilot Chat in Agent mode)

VS Code uses a servers key and can prompt for the password instead of storing it in the file:

{
  "inputs": [
    { "id": "pg-url", "type": "promptString", "description": "PostGIS connection URL", "password": true }
  ],
  "servers": {
    "postgis": {
      "type": "stdio",
      "command": "uvx",
      "args": ["mapsql-mcp", "--schemas", "public,osm"],
      "env": { "DATABASE_URL": "${input:pg-url}" }
    }
  }
}

Other MCP clients (ChatGPT-compatible, remote)

Run the streamable-HTTP transport and point the client at http://127.0.0.1:8000/mcp:

mapsql-mcp --transport streamable-http --host 127.0.0.1 --port 8000

There is no authentication on the HTTP transport: keep it on loopback or put it behind your own authenticating reverse proxy / tunnel. If you installed from a clone use "command": "python", "args": ["-m", "mapsql_mcp"].

Usage, step by step

Who it is for. GIS developers, database people, analysts and researchers who already use an AI assistant (Claude Code, Claude Desktop, Cursor, VS Code + Copilot) and have spatial data in PostGIS or Oracle Spatial. It is a building block for an assistant, not an end-user app: there is no web UI of its own, the chat window is the UI.

1. Install:

pipx install "mapsql-mcp[oracle]"     # or: pip install "mapsql-mcp[oracle]"

2. Point it at a database with a read-only user and check the connection:

export DATABASE_URL=postgresql://readonly:secret@localhost:5432/gis      # or oracle://USER:PASS@host:1521/service
mapsql-mcp --check

No database at hand? Build the bundled demo (Natural Earth + OpenStreetMap Ankara) in two minutes, see the next section.

3. Register it with your assistant. Put one of the JSON blocks from Quickstart into the client's config (.mcp.json for Claude Code, .vscode/mcp.json for VS Code, .cursor/mcp.json for Cursor, claude_desktop_config.json for Claude Desktop). In VS Code click Start above the server entry; in Claude Code run /mcp and check it says connected. You should see 14 tools.

4. Ask in plain language. For example:

• "What layers do you have? Summarise them."

• "Which pharmacies are within 500 m of Kızılay (39.9208, 32.8541)? Show them on a map."

• "Which neighbourhood has the most cafes? Colour the neighbourhoods by count."

• "The 5 hospitals nearest to this point, with distances."

• "Find the pharmacies nearby." - a good assistant asks nearby what? instead of guessing.

5. See the map. render_map returns the PNG to the assistant and saves it (and optionally an interactive Leaflet HTML) under ~/mapsql-mcp-output. Some clients (e.g. the Claude Code panel in VS Code) do not show tool images to you; add MAPSQL_OPEN_MAPS=1 (or --open-maps) to the server's env and every map opens in your default viewer.

Good to know. The assistant's provider (Anthropic, OpenAI, ...) receives the rows the tools return, so do not connect databases whose content must not leave your organisation; use --schemas / --layers to expose only what is needed, and keep the database user read-only.

Try it with the demo database (2 minutes)

The demo data is Natural Earth (world countries, provinces, cities, rivers, lakes - public domain) plus an OpenStreetMap extract of central Ankara (POIs, roads, parks, 105 neighbourhoods - ODbL). A pinned snapshot ships in demo/data (2.8 MB), so building it works offline.

docker run -d --name pg -p 55432:5432 -e POSTGRES_PASSWORD=pw postgis/postgis:16-3.4
pip install -e .
python demo/build_demo_db.py --database-url postgresql://postgres:pw@localhost:55432/postgres
export DATABASE_URL=postgresql://postgres:pw@localhost:55432/postgres

Then ask your assistant, for example:

• "What layers do you have? Summarise the Ankara data."

• "Which neighbourhood has the most pharmacies? Show it as a map."

• "Cafes within 300 m of Kızılay (lat 39.9208, lon 32.8541), on a map."

• "Find the pharmacies nearby." → it should ask where.

Map data © OpenStreetMap contributors (ODbL). Interactive versions of two of them: docs/images/*.html (open in a browser).

Oracle Spatial

New in v0.2: the same tools, the same safety model and the same maps on Oracle Database with Spatial (19c, 21c, 23ai / 26ai, Autonomous Database, ...), through python-oracledb in thin mode (no Oracle Client libraries needed).

Same question, same answer (20 pharmacies) as on PostGIS - this time from SDO_WITHIN_DISTANCE(... 'distance=500 unit=M') on an Autonomous Database. Map data (c) OpenStreetMap contributors (ODbL).

Install and connect

pip install "mapsql-mcp[oracle]"        # adds oracledb + sqlglot

All other settings (MAPSQL_SCHEMAS, MAPSQL_LAYERS, MAPSQL_STATEMENT_TIMEOUT_MS, MAPSQL_MAX_ROWS, ...) work unchanged; the timeout is applied as the connection call_timeout, schemas are Oracle owners.

Autonomous Database (TLS, no wallet). In the console open Database connection, choose TLS authentication: TLS (instead of mTLS; requires an access control list / allowed IPs for your address) and copy the Low/Medium connection string. The descriptor looks like (description=(address=(protocol=tcps)(port=1522)(host=...))(connect_data=(service_name=...))(security=(ssl_server_dn_match=yes))); put it in MAPSQL_ORACLE_DSN (it is long and contains parentheses, so it does not fit well in a URL). The server certificate is verified against the operating system's trust store. Use a dedicated read-only user, never ADMIN.

export MAPSQL_ORACLE_DSN='(description=(retry_count=3)(address=(protocol=tcps)(port=1522)(host=adb.<region>.oraclecloud.com))(connect_data=(service_name=xxxx_mydb_low.adb.oraclecloud.com))(security=(ssl_server_dn_match=yes)))'
export MAPSQL_ORACLE_USER=MAPSQL_RO MAPSQL_ORACLE_PASSWORD='...'
mapsql-mcp --check

Read-only user

scripts/oracle_readonly_user.sql is the Oracle counterpart of readonly_role.sql: a user with only CREATE SESSION plus SELECT on the tables the assistant may see. The spatial metadata views, MDSYS.CS_SRS and the SDO_* operators are available to every user, so nothing else is needed.

Claude Desktop / Claude Code / Cursor / VS Code

{
  "mcpServers": {
    "oracle-spatial": {
      "command": "uvx",
      "args": ["--from", "mapsql-mcp[oracle]", "mapsql-mcp", "--schemas", "GIS"],
      "env": { "DATABASE_URL": "oracle://MAPSQL_RO:secret@dbhost:1521/ORCLPDB1" }
    }
  }
}

claude mcp add oracle-spatial -e DATABASE_URL=oracle://MAPSQL_RO:secret@dbhost:1521/ORCLPDB1 -- uvx --from "mapsql-mcp[oracle]" mapsql-mcp --schemas GIS

VS Code (.vscode/mcp.json) - the password is prompted for and never stored in the file; a TNS descriptor goes into MAPSQL_ORACLE_DSN:

{
  "inputs": [
    { "id": "ora-pw", "type": "promptString", "description": "Oracle password for MAPSQL_RO", "password": true }
  ],
  "servers": {
    "oracle-spatial": {
      "type": "stdio",
      "command": "uvx",
      "args": ["--from", "mapsql-mcp[oracle]", "mapsql-mcp", "--schemas", "GIS", "--no-basemap"],
      "env": {
        "MAPSQL_ORACLE_DSN": "dbhost:1521/ORCLPDB1",
        "MAPSQL_ORACLE_USER": "MAPSQL_RO",
        "MAPSQL_ORACLE_PASSWORD": "${input:ora-pw}"
      }
    }
  }
}

Oracle demo schema (3 minutes)

scripts/oracle_demo_db.py loads the same Natural Earth + OpenStreetMap-Ankara data as the PostGIS demo into the schema MAPSQL_DEMO (WORLD_COUNTRIES, WORLD_CITIES, ANKARA_POIS, ANKARA_NEIGHBOURHOODS, ... - Oracle has no schemas-within-a-database convention like world.countries, so the PostGIS schema becomes a table-name prefix), registers USER_SDO_GEOM_METADATA, builds spatial indexes, adds TUREF TM30 (EPSG:5254, metres) copies of two Ankara layers to exercise projected coordinate systems, and creates the read-only user MAPSQL_RO. It needs an administrator login in a git-ignored ini file:

; oracle-test.ini
[oracle]
user = ADMIN
password = ...
dsn = (description=...)    ; or host:1521/service

python scripts/oracle_demo_db.py          # creates MAPSQL_DEMO + MAPSQL_RO (random passwords are written to the same ini file)
python scripts/make_oracle_demo_maps.py --ini oracle-test.ini     # the maps in docs/images/oracle_*.png

How the tools map to Oracle Spatial

Metres are right on geodetic layers (EPSG:4326 and Oracle's legacy 8307: geodesic on the ellipsoid) and projected layers (planar in the projection, converted with unit=M). Values are always bind variables; identifiers come from the catalog.

Differences from PostGIS to know about

• Spatial index required for SDO_* operators. Layers without a valid spatial index are queried with index-free SDO_GEOM.* functions (flagged in the response, and describe_layer warns). Create indexes (CREATE INDEX ... INDEXTYPE IS MDSYS.SPATIAL_INDEX_V2) and register the layer in USER_SDO_GEOM_METADATA for speed.

• crosses has no faithful Oracle mask: spatial_filter refuses it with an explanation instead of returning a possibly wrong answer (use intersects/touches/overlaps, or run_sql with your own SDO_RELATE mask). within/contains include boundary contact (COVEREDBY/COVERS) and EQUAL; overlaps is OVERLAPBDYDISJOINT+OVERLAPBDYINTERSECT.

• Write mode is not available on Oracle in this version (--allow-write is refused at start-up).

• Identifiers are shown in lower case (mapsql_demo.ankara_pois, column name) when they are plain upper-case Oracle names; they remain valid unquoted in SQL. Quoted mixed-case names are shown as they are and must be quoted in run_sql.

• Oracle stores the empty string as NULL. EQ '' filters are translated to IS NULL.

• Small numeric differences to PostGIS (checked on the demo data): distances within 0.1 m for geodetic layers; areas/lengths within about 0.01 %; dwithin joins on polygons can differ by a feature at the boundary; a buffer's area differs by its polygon approximation. On a projected layer distances are planar in that projection (TM30 is within about 1 m per kilometre of geodesic distances near the central meridian).

• GeoJSON conversion does not support circular arcs / compound curves (buffers of projected data are densified first); a geometry that Oracle cannot serialise makes the tool fail with an explicit database error.

• list_layers reports extents with SDO_AGGR_MBR (skipped for layers over 500 000 rows); SDO_TUNE.EXTENT_OF cannot run inside a READ ONLY transaction.

Tools

All coordinates are WGS84 lon/lat; distances are metres; areas km². Every geometry-returning tool stores the full (simplified) result server-side and returns a result_id, so render_map(result_ids=[...]) never needs the model to copy big GeoJSON around. Responses stay small: geometries above a vertex budget are returned as representative points (with a note) unless you ask for geometry="full".

Prompts: gis_assistant, spatial_question, explore_database. Resources: mapsql://guide, mapsql://layers.

Ask, don't guess

within_distance with no point and no reference feature does not guess a location; it fails with "Missing reference: near WHAT? ... ask them". A reference that matches several features returns the candidates and asks which one is meant. Likewise a missing distance, an ambiguous layer name, a numeric filter given text, swapped lon/lat ... The server instructions (sent on connect) tell the model to ask one short clarifying question first. This was motivated by the author's TR-CBS-Komut benchmark, where models differed from 0% to 98% in recognising missing information.

Safety model

Defence in depth - no single layer is trusted (SECURITY.md has the full threat model):

Configuration

Basemap tiles come from tile.openstreetmap.org with attribution, a descriptive User-Agent, a ≤ 16-tile cap per map and an on-disk cache. Please respect the OSM tile usage policy; for heavy use point MAPSQL_BASEMAP at your own tile server, or use none (works fully offline).

Benchmark: mapsql-bench

bench/ ships 60 English GIS questions over the demo database (52 answerable + 8 that must be answered with a clarifying question), in 8 categories (attribute, distance, spatial, aggregate, join, buffer, bbox, ambiguous), with gold answers computed by hand-written SQL, and a runner that evaluates any OpenAI-compatible model (OpenAI, OpenRouter, vLLM, Ollama, LM Studio ...) in an agent loop that calls this server's tools over stdio:

python bench/run_bench.py --oracle                  # no LLM: replays one reference tool call per question
python bench/run_bench.py --validate-gold           # re-checks gold answers against the database
python bench/run_bench.py --model gpt-4o-mini --api-key-env OPENAI_API_KEY
python bench/run_bench.py --model qwen2.5:7b --base-url http://localhost:11434/v1

Scoring: numbers within a tolerance, names as case/accent-insensitive sets, and for ambiguous questions the model must end with CLARIFY: instead of ANSWER:. What is verified today (v0.1): the gold answers match the database (52/52) and the toolset can express every answerable question (oracle 52/52). No LLM results are published yet - the harness is ready; PRs adding model results to bench/RESULTS.md are very welcome.

Limitations (v0.2)

• PostGIS or Oracle Spatial (one database per server); geometry/geography columns (PostGIS) or SDO_GEOMETRY columns (Oracle) of tables, views, materialised views, foreign tables. Oracle specifics: see Differences from PostGIS (read-only only, no crosses, index-free fallback).

• No raster, topology or 3D support in the structured tools (run_sql can still query them).

• The basemap needs internet (graceful fallback to a plain background) and supports OSM-style raster tiles only.

• render_map draws one flat colour per layer, plus a single-variable choropleth; no custom styling yet.

• The HTTP transport has no auth; execute_sql is a deliberately small write surface.

• Cross-CRS joins transform the left geometry; very large cross-SRID dwithin joins can be slow.

• Tested against PostgreSQL 18 / PostGIS 3.6 and Oracle Database 26ai (23.26, Spatial 23.7, Autonomous Database Always Free) with mcp 1.30 and 2.3 (the code supports both SDK generations); CI runs PostGIS 3.4 / PostgreSQL 16 and the Oracle guard tests (the database-backed Oracle tests skip without credentials).

Roadmap

• v0.3: Oracle write mode (narrow guard), Oracle SDO_JOIN/Spatial Studio extras, auth for HTTP (bearer tokens), per-tool allowlists, vector-tile/PMTiles basemaps, raster/H3 summaries, an explain tool, routing helpers (pgRouting), result export (GeoJSON/GeoPackage), richer map styling

• v0.4: multi-database profiles, MCP elicitation for clarifying questions (instead of plain-text asks), catalog caching knobs

• Published benchmark results for popular models + a public leaderboard

Development

python -m venv .venv && .venv/bin/pip install -e ".[dev]"
# a throwaway PostGIS (never point the tests at a database you care about):
docker run -d -p 55432:5432 -e POSTGRES_PASSWORD=pw -e POSTGRES_DB=mapsql_test postgis/postgis:16-3.4
export MAPSQL_TEST_DATABASE_URL=postgresql://postgres:pw@localhost:55432/mapsql_test
pytest                      # guard tests need no database; the rest recreate schemas `mt` and `mt_other`

Oracle tests (pytest -m oracle) run when oracle-test.ini ([oracle_ro], see above) or MAPSQL_TEST_ORACLE_URL / MAPSQL_TEST_ORACLE_DSN+_USER+_PASSWORD is available and scripts/oracle_demo_db.py has been run; otherwise they are skipped. The Oracle SQL guard tests need no database.

See CONTRIBUTING.md. Windows helper for a local cluster: scripts/dev_cluster.ps1.

Türkçe

mapsql-mcp, yapay zekâ asistanlarının (Claude Desktop/Code, Cursor, ChatGPT uyumlu MCP istemcileri) bir PostGIS veya Oracle Spatial (v0.2) veritabanını güvenli biçimde sorgulamasını, mekânsal analiz yapmasını ve cevabı harita olarak sohbette göstermesini sağlayan açık kaynaklı bir MCP sunucusudur.

• Güvenlik önce: her sorgu gerçek PostgreSQL ayrıştırıcısı (pglast) ile doğrulanır; tek SELECT, READ ONLY işlem, zaman aşımı ve satır sınırı. pg_read_file, COPY, dblink, lo_* vb. engellidir. Yazma varsayılan olarak kapalıdır (--allow-write). Şema/katman izin listesi (--schemas, --layers) desteklenir; parola ve bağlantı dizesi çıktıya sızmaz.

• Mekânsal araçlar: list_layers, describe_layer, within_distance (metre cinsinden, SRID'den bağımsız), nearest, buffer, spatial_filter, aggregate, spatial_join, bbox_of, run_sql ve render_map (OSM altlıklı PNG + isteğe bağlı etkileşimli Leaflet HTML, kloropet harita).

• Belirsizse sorar: "yakındaki eczaneler" gibi eksik bilgili sorularda model tahmin yürütmek yerine "neye yakın?" diye sorar (araçlar da eksik girdiyi reddeder). Bu, yazarın TR-CBS-Komut kıyaslamasından çıkan bir derstir.

• Kıyaslama: bench/ altında demo veritabanı üzerinde 60 İngilizce CBS sorusu (8'i "sormalı" tipi), altın cevaplar ve herhangi bir OpenAI uyumlu modeli deneyen çalıştırıcı bulunur.

Oracle Spatial: pip install "mapsql-mcp[oracle]" ve DATABASE_URL=oracle://KULLANICI:SIFRE@sunucu:1521/servis_adi (uzun TNS tanımlayıcıları için MAPSQL_ORACLE_DSN + MAPSQL_ORACLE_USER + MAPSQL_ORACLE_PASSWORD). Aynı 14 araç; mesafeler unit=M ile metre cinsinden, coğrafi (4326) ve projeksiyonlu (ör. TUREF TM30, EPSG:5254) katmanlarda doğrudur. Sorgular sqlglot (Oracle lehçesi) ile doğrulanır, SET TRANSACTION READ ONLY ve salt okunur kullanıcı (scripts/oracle_readonly_user.sql) önerilir. Ayrıntı: yukarıdaki Oracle Spatial bölümü.

Kimin için? Yapay zekâ asistanı (Claude Code, Claude Desktop, Cursor, VS Code + Copilot) kullanan ve mekânsal verisi PostGIS ya da Oracle Spatial'da duran CBS geliştiricileri, veritabanı uzmanları, analistler ve araştırmacılar için. Son kullanıcı uygulaması değildir; kendi ekranı yoktur, arayüzü sohbet penceresinin kendisidir.

Adım adım kullanım

1. Kurulum:

pipx install "mapsql-mcp[oracle]"     # ya da: pip install "mapsql-mcp[oracle]"

2. Veritabanını salt okunur bir kullanıcıyla bağlayın ve bağlantıyı deneyin:

export DATABASE_URL=postgresql://salt_okunur:sifre@localhost:5432/cbs     # ya da oracle://KULLANICI:SIFRE@sunucu:1521/servis
mapsql-mcp --check

Salt okunur kullanıcı betikleri: scripts/readonly_role.sql (PostGIS), scripts/oracle_readonly_user.sql (Oracle). Elinizde veritabanı yoksa yukarıdaki Try it with the demo database bölümüyle iki dakikada demo veritabanı kurulur (Natural Earth + OpenStreetMap Ankara).

3. Asistana tanıtın. Quickstart bölümündeki JSON örneklerinden birini istemcinin ayar dosyasına koyun: Claude Code için .mcp.json, VS Code için .vscode/mcp.json, Cursor için .cursor/mcp.json, Claude Desktop için claude_desktop_config.json. VS Code'da sunucunun üstündeki Start'a basın; Claude Code'da /mcp yazıp connected olduğunu görün. 14 araç listelenmelidir.

4. Türkçe sorun. Örnekler:

• "Hangi katmanlar var? Özetle."

• "Kızılay'a (39.9208, 32.8541) 500 m içindeki eczaneleri haritada göster."

• "En çok kafesi olan mahalle hangisi? Mahalleleri kafe sayısına göre renklendir."

• "Bu noktaya en yakın 5 hastaneyi mesafeleriyle listele."

• "Yakındaki eczaneleri bul." — iyi bir asistan tahmin etmez, "neye yakın?" diye sorar.

5. Haritayı görün. render_map haritayı asistana PNG olarak döner ve ~/mapsql-mcp-output klasörüne kaydeder (istenirse etkileşimli Leaflet HTML de). Bazı istemciler (ör. VS Code'daki Claude Code paneli) aracın resmini size göstermez; sunucunun env kısmına MAPSQL_OPEN_MAPS=1 (ya da --open-maps) ekleyin, her harita varsayılan görüntüleyicide açılır.

Bilmeniz gereken. Asistanın sağlayıcısı (Anthropic, OpenAI vb.) araçların döndürdüğü satırları görür. Kurum dışına çıkmaması gereken verinin bulunduğu veritabanlarını bağlamayın; --schemas / --layers ile yalnız gereken katmanları açın ve veritabanı kullanıcısını salt okunur tutun. Demo veri: Natural Earth (kamu malı) ve OpenStreetMap (ODbL), ayrıntı: demo/ATTRIBUTION.md.

Yazar: Mehmet Veysel Delibaş, CBS yazılım mühendisi (Türkiye).

License and attribution

Code: MIT © 2026 Mehmet Veysel Delibaş. Demo data: Natural Earth (public domain) and OpenStreetMap (© OpenStreetMap contributors, ODbL); see demo/ATTRIBUTION.md. Maps rendered with the OSM basemap carry the required attribution.