Document web mercator requirement

[gavinr]

As mentioned, we should document this: #86 (comment)

Also, since it's tripping other up, we should add a console.error() (or console.warn()?) message to show when not using web mercator

[jwasilgeo]

@gavinr @patrickarlt to catch this one and put in a warning for L.esri.Vector.vectorTileLayer right about at this spot, which of these spatialReference.wkid properties do we want to rely upon?

• service.initialExtent.spatialReference.wkid
• service.fullExtent.spatialReference.wkid
• service.tileInfo.spatialReference.wkid

Ref: https://developers.arcgis.com/rest/services-reference/enterprise/vector-tile-service.htm

[gavinr]

My vote would be service.tileInfo.spatialReference.wkid

[jwasilgeo]

This is available now in the recent v3.1.0 release. 🎉

[scaddenp]

There are a lot vector tile layers in another projection that have been published on arconline that I would like to use. Is it a lost cause to be able to use them in leaflet or is it a programming issue that just needs somebody to work on it?

[jwasilgeo]

@scaddenp a good explanation for this limitation is described here: #86 (comment)

For now we have to wait and hope for mapbox-gl-js v1 (or maplibre-gl-js) to add this functionality.

[scaddenp]

Hmm, this is complicated by the whole "make mapbox work in non-mercator tiles" which is a larger problem than rendering a non-mercator VectorTileService. I think I need a deep dive into code at some point. Support for the ESRI tiling schemes already exists in the leaflet code - in image tile services. A native renderer for pbf looks to be the crux.