Info

The Trailmap app has been made possible by open map data and by the work of contributors in various communities, especially the open source and open map data communities - thank you! A central goal of the Trailmap app has been to support the work of these contributors, alongside the end users.

Map data and map style

• OpenStreetMap © OpenStreetMap contributors (ODbL licence) community map
• Maanmittauslaitos (open data licence CC BY 4.0) topographic map, orthophoto and laser scanning data
• MML's topographic map and orthophoto provided by the Kapsi Internet-käyttäjät ry service
• Digiroad road and street network data, Fintraffic (formerly Väylävirasto) (CC BY 4.0)
• Suomen ympäristökeskus (Syke) lake and river depth data (CC BY 4.0)
• Traficom depth data (CC BY 4.0)
• Lantmäteriet (Sweden) Topografisk webbkarta (open data)
• Kartverket (Norway) Topografisk norgeskart (CC BY 4.0)
• Klimadatastyrelsen (Denmark) Danmarks Topografiske Kortværk DTK/25 (CC BY 4.0)
• Instituto Geográfico Nacional (Spain) Mapa Topográfico Nacional (CC BY 4.0)
• Maa- ja Ruumiamet, formerly Maa-amet (Estonia) põhikaart and ortofoto (open data licence)
• MapTiler map data
• Mapterhorn elevation model data
• Mapbox satellite imagery and elevation model data, satellite imagery © Maxar
• Esri contour lines, hillshade and orthophoto
• Google Street View © Google (Google Maps terms of service)
• Orienteering maps "Mapant" and "Mapant España" (CC BY 4.0)
• Lipas sports facility data, Faculty of Sport Sciences at the University of Jyväskylä (CC BY 4.0)
• MTB map style Antti Nissinen & Tapio Kaasalainen
• Garmin MTB map style Tapio Kaasalainen

Open source projects

It is impossible to list all the open source projects the app makes use of, so first a general thank you to everyone working to advance functioning open source. Below are the most important projects that have made the Trailmap app possible:

Frameworks and platforms

• React & React Native
• Next.js
• Expo
• TypeScript

User interface

• Material UI
• React Native Elements
• MobX
• i18next
• PostHog

Maps and geospatial data

• MapLibre
• GraphHopper
• Open Source Routing Machine (OSRM)
• PostgreSQL & PostGIS
• Geospatial Data Abstraction Library (GDAL)
• Planetiler
• Tippecanoe
• TileServer GL
• OpenMapTiles
• MapProxy
• Overpass API
• OpenTopoData

Backend systems

• Kubernetes
• tRPC
• Fastify

Trailmap app

Copyright (c) 2026 Markus Suomi (markus at trailmap.fi) All rights reserved.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.