This is a console application that takes an OSM file and performs an analysis on the ways (streets) based on the information stored in their tags. The arguments are as follows:
node main.js -f osmfilename -d outputpath [-m model][-n][-p prefix][-v][-z]
where:
- model is either stressmodel or wintermodel. The default is stressmodel.
- osmfilename is the path to an OSM file to be processed.
- outputpath is the directory where the output files will be created.
- prefix is the prefix to be appended to the start of the output filename. The default is 'level_'.
- -n requests that the way names be included in the output.
- -v requests verbose output to the console.
- -z requests that a level 0 file also be generated that includes the highways where cycling is not permitted.
See the usage output for an up-to-date list of options.
Clone and install dependencies:
git clone https://github.com/BikeOttawa/stressmodel.git
cd stressmodel
npm install
node main.js -f ~/maps/myosmfile.osm -d /var/www/stressmap/data -p lts_ -z
will analyze the specified OSM file using the default stressmodel and will produce 4 output files in geojson format in the /var/www/stressmap/data directory. The files will be named lts_1.json, lts_2.json, lts_3.json and lts_4.json and each will contain the streets for the corresponding LTS level (1-4). An additional file called lts_0.json will be generated that includes non-cycling highways.
If you are using stressmap to display the files, you should generate the files with the default value for the prefix "level_". This data should be placed in the app/data directory. For more information, see the documentation for stressmap.
To obtain OSM data, you will need a query that describes the values you want. This is the query used by Bike Ottawa for its mapping project:
[timeout:600][maxsize:2000000000][bbox:44.927,-76.361,45.598,-75.052];
(
way["barrier"];
node(w)->.b;
(way["highway"]; - way[footway="sidewalk"];);
node(w)->.h;
(way[footway="sidewalk"][bicycle]; - way[footway="sidewalk"][bicycle="no"];);
node(w)->.s;
node.b.h.s;
);
out;
The bbox parameter marks the outer boundary of the area to be retrieved as lat/long coordinates. More information on how to construct queries can be found on the Overpass API/Language Guide. There is also a web based query tool called Overpass Turbo that provides an excellent way to refine and test your queries.
Once your query is working, the Overpass Turbo tool can be used to download OSM data. If you want to automate the process, you can use the following example:
wget -nv -O ~/maps/myosmfile.osm --post-file=~/maps/myosmfile.query "http://overpass-api.de/api/interpreter"
This uses the query saved in ~/maps/myosmfile.query to download the required values to ~/maps/myosmfile.osm. If wget is unavailable, the curl utility may also be used on some operating systems.