E.Slope

Enhanced slope overlays for the alps, to use for hiking, ski-touring, alpinism, ...

<img src="img/malinvern_s_eslo14near.png" width="400" style="display: block; margin-left: auto; margin-right: auto;"/>

Status

Downloads are available. Tile hosting is available, but stability is not guaranteed.

For elevation data, see below. For slope data in mbtiles format, this is currrently split into 4 files available in the releases folder. They cover the following area:

<img src="development/img/geo/eslope_alps_extents.jpg" width="1000" style="display: block; margin-left: auto; margin-right: auto;"/>

Palette used

For a discussion of the design process behind this palette, and a comparison, see geo-slope-color-palette.

How to use the maps online?

• Online
  • Head to WTracks. This link auto-activates the right overlay, called EU eSlope Western-Alps.
  • Or configure your tool of choice with the correct URL. The Leaflet URL is https://www.montagne.top/tile/AlpsWC_eslo/{z}/{x}/{y}.png

How to use the maps offline?

• You need an app supporting mbtiles:
  • For Android, options include AlpineQuest (~10€ on play store) ; OruxMaps (free online ; 4€ on play store) ; Locus ; and more.
  • For iphone, MBTiles GPS (untested)
  • On the PC, I haven't found simple viewers that support layers. QGIS is way too complex for this task. GPXSee is an excellent viewer, but single-layer. Maybe ape@map (German, untested)
• Download the latest mbtiles files, found in this drive folder. Currently it's a single file AlpsWC.mbtiles weighing 7 GB, sorry.
• Configure the app to use it:
  • For AlpineQuest, import as file-based map, use "Add as Layer". Then set opacity to ~50% and Layer Blending Mode (💧icon) to "Multiply".
  • For OruxMap, place it in the correct folder, something like /sdcard/oruxmaps/mapfiles and follow manual

How to web-host the tiles

Check the upcoming dedicated Hosting.md. I use go-pmtiles, but many alternatives exist including a go mbtileserver, and MapTiler tileserver.

Coverage & Data

The area covered currently is a part of the western alps, in GPS terms from lower-left 43.580 N 5.625 E to upper-right 46.558 N 7.734E, or as a mnemonic, Lausanne-Jouques-Sanremo-Zermatt. Some (lower elevation) areas are not covered.

Zoom-levels:

• Only zoom-level 16 is provided so far. Other levels are filled white to avoid artifacts. It means an actual pixel resolution of 1.7 meters at 45° (`=2.38778.648/111.321`)*.
• This is a deliberate choice to avoid cluttering lower zoom-level, but can be improved.
• Level 17 would bring improved resolution under 1m/px, but at a big cost in storage space, and without the corresponding quality increase, since most available data is at around 5m resolution.

Data sources:

W/C/E stands for Western / Central /Western Alps. Links lead to the corresponding notebook

• France: RGE ALTI 5m. Mostly based on Radar, with a "real" resolution closer to 30m. ⚠️ Only departements n° 04 05 06 38 73 74
• Italy>Piemonte: RIPRESA AEREA ICE 2009-2011 - DTM 5, hosted here
• Italy>Aosta: DTM 2005 / 2008 aggregato
• Switzerland: SwissAlti3D
• Austria: Geoland Geländemodell 10m

For details on the data wrangling process: IGN-data-gdaldem

Links

• openslopemap.org. E.Slope is very similiar in spirit, but with more focus on model precision for the western alps, different technical and aesthetical choices, and an open development process. Kudos to the OpenSlopeMap team for the inspiring work!

• A tutorial for Austrian elevation data: terrain-rgb

• Hosting tiling-notes

License

The code in this repository is under CC 1.0. The elevation data is under specific open licenses:

• Western Alps:

  • IGN
  • GeoPiemonte
  • SwissTopo

• Central & Eastern Alps:

  • Austria (10m resolution): Data source: Geoland.at, digital 10m - terrain model from Airborne Laserscan data
    license: Creative Commons Attribution 3.0 AT
  • South Tyrol (5m and 10m resolution): Data source: Autonomous Province of Bozen South Tyrol
    License: Creative Commons BY 3.0
  • Trentino (10m resolution): Data source: La Provincia Autonoma di Trento
    License: Creative Commons - Attribuzione 2.5 Italia
  • Austria - Tyrol (5m and 10m resolution): Data source: Land Tirol - data.tirol.gv.at
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Salzburg (5m and 10m resolution): Data source: State of Salzburg - geodata & maps
    license: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Vorarlberg (5m and 10m resolution): Data source: Land Vorarlberg - VOGIS Vorarlberg
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Styria (10m resolution): Data source: Land Steiermark - www.gis.steiermark.at
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Carinthia (10m resolution): Data source: Province of Carinthia - KAGIS Carinthia
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Upper Austria (10m resolution): Data source: Province of Upper Austria - DORIS Upper Austria
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Lower Austria (10m resolution): Data source: Province of Lower Austria - Maps & Geoinformation
    in Lower Austria
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Vienna (10m resolution): Data source: City of Vienna - https://data.wien.gv.at
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Austria - Burgenland (10m resolution): Data source: Burgenland - GeoDaten BURGENLAND
    License: Creative Commons Attribution 3.0 AT (CC BY 3.0 AT)
  • Bavaria (50m resolution): State Office for Digitization, Broadband and Surveying Bavaria
    License: Creative Commons BY Attribution 3.0 DE
  • Eastern Alps (20m resolution): Sonny at opendataportal.at
    License: Creative Commons Attribution 3.0 Austria
  • General: www.viewfinderpanoramas.org
    Terms of use: “Terms of use” on www.viewfinderpanoramas.org
  • General: SRTM data are public domain