Collection of hiking maps, optimized for mobile use, based on OSM data.

npm install
gulp
gulp devel

sudo apt-get install python-gdal gdal-bin
npm install -g topojson

• Create a directory named ./data/.
• Download tiles from https://earthexplorer.usgs.gov/, from the SRTMGL1v003 dataset. They come as .hgt.zip files. Unarchive the files and place the .hgt files under ./data/srtm-hgt/.
• Run make to convert the files to tif and create a mosaic file.
• Create a folder named ./data/contours/.

Create map for specific region, eg. for Piatra Craiului (crai):

gulp data-crai # "crai" is the region name

For each region, we query Overpass, filter the results, and convert them to TopoJSON. Elevation contours are from SRTM. We then package all data for a region as JSON, the largest is almost 1MB, and they compress to ~30% of the original size with gzip. In the browser, we save the data in appcache, and render the map as SVG, using D3.js and lots of creativity :)

Code is licensed as MIT. Data is © OpenStreetMap contributors, except for contour lines, which come from NASA's SRTM dataset.