TileLayer with two sources at different zoom levels

[kylebarron]

The TerrainLayer specifically is in mind here, but this is a general TileLayer question: If you have two tiled datasets that depend on each other, is there a way to define their min and max zooms separately?

In a terrain use case, you might have a tiled terrain source that exists for zooms 1-13 but an imagery source that exists for zooms 1-15. It might be possible to use separate Tileset2D instances for each data source?

[j6k4m8]

Probably the easiest way to do it is with two totally separate layers with different minZoom and maxZoom attributes...

[kylebarron]

two tiled datasets that depend on each other

[j6k4m8]

As long as the coordinates overlap, I think it should still work, no?

[kylebarron]

No; in the original scenario, you might want to render a TerrainLayer, but your terrain data might only be valid up to zoom 12 while you have imagery up to zoom 15. I don't think there's currently a way to display the accurate imager data at zooms 12-15 while using terrain mesh from zoom 12. This is a scenario where the two data sources necessarily depend on each other.

To fix this, you'd need to allow each data source to "overzoom" independently. You'd in effect need to select a portion of the terrain source and resize it to your tile size, so that the terrain and image can use the same pixel coordinates in the GPU.