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Steffen Exler edited this page Aug 5, 2020 · 1 revision

Openstreetmap-Carto

The openstreetmap-carto project is the official repo for the style sheets of OpenStreetMap.org.

For this project there is a fork of openstreetmap-carto, which can handle the time request on Postgres SQL. The fork is hosted on github.com.

The difference between the fork version and the original is the file /project.mml. For each request is a WHERE clause added, which check in the columns valid_since & valid_until if the request is for the current date. The data parameter is added by {{ date.strftime('%Y-%m-%d') }} and will be converted in a python script with jinja2 into the requested date. Below, we depict an example of modified clause.::

(SELECT
    valid_since,
    valid_until,
    way
    FROM planet_osm_line
    WHERE valid_since <= '{{ date.strftime('%Y-%m-%d') }}'
        AND valid_until >= '{{ date.strftime('%Y-%m-%d') }}'
        AND (man_made = 'cutline')
) AS landcover_line
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