GeoJSON support

It would be very useful if Mapsui had intrinsic support for the GeoJSON format.

To implement this, one could simply set up a GeoJsonProvider (implementing the IProvider) interface, much like the ShapeFile or WmsProvider. This would read & parse a GeoJSON file (could be a local file or remote URL) and spit out the corresponding list of features, which could then be rendered via some layer.

Any comments on this idea or how to implement it? I am slightly surprised that no one has started this kind of thing yet 😄

[pauldendulk]

GeoJSON support was added by @inforithmics in Mapsui.Extension. See the online sample by selecting ‘GeoJson’ under ‘Data Formats’.

[janusw]

I’ll note that there seem to be two geojson files in the repository:

• https://github.com/Mapsui/Mapsui/blob/master/Samples/Mapsui.Samples.Common/EmbeddedResources/cities.geojson
• https://github.com/Mapsui/Mapsui/blob/master/Samples/Mapsui.Samples.Common/EmbeddedResources/countries-hires.json

… but apparently they’re not being used anywhere.

Fun fact on the side: Opening the first link actually visualizes the city pins on a (mapbox) world map, so apparently GitHub itself has GeoJSON support 😉 With the second link this does not work though, probably because of the differing file extension.