roma8ok/getmapstack/map

Map

The container already serves a vector map, its style and a renderer on port 4326. A page that shows your GeoJSON on it is one template and two copies away, and it needs no internet and no second server.

Show a file

cp assets/map.html page.html
docker cp page.html getmapstack:/data/explorer/page.html
docker cp found.json getmapstack:/data/explorer/data.json

Open http://localhost:4326/page.html and say so in the answer: a file written to disk that nobody can open is not a map.

The page reads ./data.json, whatever the file was called before the copy. Paths in this skill are relative to the skill's own directory.

What the page renders

Points as circles, lines as lines, polygons as a translucent fill, and the view fitted to everything in the file. Five properties on a feature change how it is shown, and every other property is ignored:

• label - text over a point (a stop number, a rank)
• color - the circle, line or fill colour, a hex string with the #
• name - a tag beside the point from zoom 13, and the popup that opens on click
• leg_time_s, leg_length_m - a second popup line, as minutes and kilometres

A file with none of these still renders. Do not edit the template to change colours or labels: set the properties in the data instead, and the same page keeps working for the next file.

References

• The page in full, the same page outside the container, a static image, attribution:

references/render.md