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Jelmer van der Linde 5 years ago
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README.md

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# Beacon map
This map shows all the blinking beacons from [OpenStreetMap](http://www.openstreetmap.org/).
![Demo time](https://geodienst.github.io/lighthousemap/demo.gif)
More specifically, it asks the [Overpass API](https://www.overpass-api.de) for all elements with an `seamark:light:sequence` attribute, decodes these, and displays them as coloured circles on the map using [Leaflet](http://leafletjs.com). It also tries to take the `seamark:light:range` and `seamark:light:colour` into account.
## Overpass API
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## Useful stuff
The `leaflet.indexedfeaturelayer.js` file contains an extension on Leaflet's GeoJSON layer that only add layers/features to the map that are (or are about to be) visible. It uses a spatial index to quickly query which features can be removed from the DOM, increasing performance.
`leaflet.light.js` contains my best guess on how a light sequence will look based on (these descriptions)[http://wiki.openstreetmap.org/wiki/Seamarks/Light_Characters]. However, it might be inaccurate, and it tries to do its best with the sometimes not entirely consistent data from OSM.
`leaflet.light.js` contains my best guess on how a light sequence will look based on [these descriptions](http://wiki.openstreetmap.org/wiki/Seamarks/Light_Characters). However, it might be inaccurate, and it tries to do its best with the sometimes not entirely consistent data from OSM.
## Credits
This map is made by the [Geodienst](http://www.geodienst.xyz) because it was a fun idea we wanted to try out. Feel free to fork this map and make your own visualisation of OSM data, or contribute improvements back to us.

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