[GIS] Leaflet – what to do when your maptiles don’t load

leaflettiles

I'm using Leaflet, and using OSM's tile.openstreetmap.org tile server. However, sometimes my application does not load the maps tiles. It seems OSM's servers are having some problems sporadically, which is out of my scope of fixing. So, my question:

Is it possible to wait an X amount of time for the tile server to load the requested tiles, before trying to contact another URL for its tiles?

Best Answer

I don't think Leaflet supports this out of the box. However, I think you can implement such a behavior using events such as tileloadstart and tileload: http://leafletjs.com/reference.html#tilelayer-tileloadstart

For example, you could start counting time the first time a tileloadstart is fired using setTimeout, and cancel it (using clearTimeout) once a tileload is fired. If nobody cancels the setTimeout, swap the base OSM layer for another one.

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[GIS] the default projection in Leaflet

Leaflet's default projection is EPSG:3857, also known as "Google Mercator" or "Web Mercator" and sometimes designated with the number "900913". This projection is what most slippy tile based maps use, including the common tile sets from Google, Bing, OpenStreetMap, and others. You can easily use this projection in QGIS by selecting "Google Mercator EPSG:900913".

Leaflet has some basic support for displaying maps in other projections. Most folks who do that seem to use the addon Proj4Leaflet to perform the projection.

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To give an answer to this: You can set relative paths, this is no problem. But the URL has to look like this (without the dollar signs).

var map = L.map('map_canvas');
map.setView([50, 10.0], 6);      

var layer = L.tileLayer('data/map/{z}/{x}/{y}.png', { maxZoom: 16 });    
map.addLayer(layer);

where data is a subdirectory of the current directory, where the html file with this javascript code is executed.

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