Introduction

OpenStreetMap services for the village of Saint-Cergue in Switzerland using the latest developments in open data, analytics and visualisation are being set up in order to map the Jura Mountains' trails, wildlife, historic sites, etc. in detail.

For the Geneva-end of the Jura Mountains starting south of Saint Cergue and extending towards Basle, the main website offers:

Components

Tools:

The main site comprises:

  • an OpenStreetMap (OSM) back-end tile server with an OSM base layer and a high-resoution Digital Elevation Model (DEM) relief layer (a Swisstopo swissAlti3D product) for detailed mapping;
  • a simplified version of the discontinued proof-of-concept TrekView Explorer for the panoramic viewing of trails;
  • a Potree viewer for the LIDAR point-cloud imaging of slected sites.
Land use


A start has been made with land use - land class (LULC) mapping using OpenStreetMap data. The GLASS osm2lulc package was used to create a LULC shapefile that was split into layers using QGIS GDAL modules. Layers exported from QGIS as geojson files were then combined and converted to .mvt files using lab-geojson2mvt.  The .mvt files were simply loaded into an apache2 website. 

The aim is to investigate whether or not localised, relatively small-scale LULC maps are sufficiently sensitive for use as the basis for estimating changes in class-derived physical conditions (heat, noise, humidity, wind, light, etc.) that would accompany changes to the LULC arising from the introduction of green infrastruture or high-rise buildings, for example.

Imagery

Incoporating Sentinel 2 satellite imagery is in progress. As the site is mainly aimed at mapping in detail the Jura Mountains in the south-western corner of Switzerland, the mapping of mountain pastures has been started. Currently available are maps of the Sentinel2 Leaf Index (Se2LI) biomass index  calculated using the Copernicus Sentinel2 A and B 20 metre resolution red-edge (Band 5) and near-infrared (Band 8A) bands pan-sharpened to a resolution of 10 metres and captured in May to November 2020. The maps show how the mountain pastures were grazed during 2020. 

OSM sites

The main map site is based on the Ubuntu 18.04 Switch2OSM site that is compatible with a local copy of the Rails port of the OSM website. This allows a JOSM editor to use a rendered map that shows edits  (changes to the OSM website database are synchronised with the rendering and Overpass databases, see Rion1 and Rion2).

Details of a Ubuntu 20.04 Switch2OSM rendering site have been released, based presumably on the Postgresql 12 database and the Postgis 3 extension. It is unclear if the OSM website can be upgraded similarly to allow synchronisation of the editing  and rendering  databases.

The very recent baremaps vector tiles represent a radical new approach (see map) which will simplify the application of OpenStreetMap technologies at a relatively localised project level.

Full details will be provided in due course.

The main purpose of the mapping exercise is to providea  detailed, hand-on experience with the lateest developments in OSM technologies. These developments are being investigated in a broader context.

24 November 2020


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