Endless zoom on offline basemap with tiled layer

MichaelMoor

Hi there!

with the 10.2.5 SKD we found a solution to zoom in more than there are Level of Details defined for the TiledLayer.

// Set the maximum zoom level.
mapView.maxScale = mapView.scale(forResolution: 0.002)
mapView.minScale = 250000
self.currentBaseMap?.maxScale = mapView.scale(forResolution: 0.002)
self.currentBaseMap?.minScale = 250000

you can see the resulting screenshot attached. it looks ugly but does the job for our customers.

In the last 3 month we migrated to 100.4

even if i managed to zoom in indefinitely with that code:

mapView.map?.maxScale = 0

mapView.map?.minScale = 0

the basemap does not resample after reaching the maximum Level of Details.

how do i achive the same result as with the old SDK?

Thank you very much!

Cheers,

Mike

endlesszoom.png

jcarlson_0-1629222089704.png

Nicholas-Furness

Note that technically you just need to set maxScale. It's a combination of 3 things.

1. You should set maxScale = 0 on the AGSMap to ensure that Runtime will allow your app to zoom in all the way.
2. You should set maxScale = 0 on the layer to ensure that Runtime will display the layer even beyond its original declared scale range as you zoom in. (Set minScale if you also want it displayed all the way as you zoom out.)
3. In this case, a Tiled Layer, you should set the noDataTileBehavior to .upSample to ensure the layer is drawn with the best available tile even if there is not specific tile for the map scale as you zoom in.

There was a bug in Runtime 100.x which meant that layers with some tiling schemes would fail to display beyond the level that tiles had been created even if you set maxScale = 0. This was fixed at 100.5.

Thanks for your help in reproducing this, Mike.

Nick.