topic Re: Allow zoom above max level of details ? in ArcGIS JavaScript Maps SDK Questions

Allow zoom above max level of details ?

devmap125 — Fri, 15 Apr 2022 13:37:47 GMT

Hi ESRI community,

I have a simple problem I believe, in a basic map setup, I can add a layer like this

map = new Map({basemap: "topo-vector" });

new MapView({ map: map,....});

map.add(new ImageryTileLayer({url:".../Terrain3D/ImageServer"}));

but when I zoom too much in the layers disapears,

my question:

how can I force the display of last available Level Of detail ? to be clear, I don't want to limit the mapzoom to the max layer's LOD, I want to zoom as much as possible even if pixelated

in advance for your help a big thx !

Re: Allow zoom above max level of details ?

MarkW — Fri, 15 Apr 2022 15:50:19 GMT

Hello,

You should be able to update the max and min scale so that the layer does not disappear at different levels of zoom. Here is the documentaion: https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-ImageryTileLayer.html#maxScale.

I hope this helps.

Re: Allow zoom above max level of details ?

devmap125 — Fri, 15 Apr 2022 18:06:20 GMT

hello thank you for yuour answer but I have been through that already,

, as you can read in the link you mention ,

maxScale: If the map is zoomed in beyond this scale, the layer will not be visible

if you have other suggestionI'm still looking

Re: Allow zoom above max level of details ?

MarkW — Fri, 15 Apr 2022 18:11:24 GMT

Oh ok, do you mind sharing your layer so I can do some troubleshooting with it?

Thanks

Re: Allow zoom above max level of details ?

devmap126 — Wed, 20 Apr 2022 07:29:44 GMT

yes of course, it's this one :

https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer

I use it in combination with a RasterShadedReliefRenderer to colorize the map elevation with the colorRamp

It works like a charm from a far, but it's very frustrating when I zoom too much in I loose the colored layer, I made this tool to find new spots to pratice my sport, but from so far it's useless sadly ...

With https://elevation3d.arcgis.com/arcgis/rest/services/Elevation/World_Hillshade/MapServer (TileLayer) I can zoom how much I want ... but not use RasterShadedReliefRenderer and ColorRamps

Re: Allow zoom above max level of details ?

devmap126 — Wed, 20 Apr 2022 07:21:31 GMT

any one ? 🙂 @MarkW

Re: Allow zoom above max level of details ?

MarkW — Wed, 20 Apr 2022 20:46:41 GMT

Unfortunately this appears to be a bug right now, I have reported it so hopefully it gets addressed soon. Sorry for the inconvenience. I will let you know if I discover anything else.

Re: Allow zoom above max level of details ?

devmap126 — Thu, 21 Apr 2022 08:03:55 GMT

@MarkW Oh shout ! I've been battling with this for a while, I even had posted an other question few month ago about it with no answer. Any idea If I can reverse engeneer the JS and just trig an event to un hide the layer from the console manualy ?

Re: Allow zoom above max level of details ?

UndralBatsukh — Thu, 21 Apr 2022 17:13:57 GMT

Hi there,

This is not a bug! The API working as designed. ImageryTilelayer does a raster level overzoom not a tile based over zooms. It will over zoom the data from the last available LOD. There is no data for areas such as Tibet at the last available LOD. So when we over zoom, we don't show data since there is no data available at the last available LOD. We can add a boolean flag to resample tiles from its last available LOD. However, in this case the result will be incorrect completely.

-Undral

Re: Allow zoom above max level of details ?

MarkW — Thu, 21 Apr 2022 17:22:21 GMT

Oh ok, thank you for letting us know! So it is simply working as designed.

Re: Allow zoom above max level of details ?

UndralBatsukh — Thu, 21 Apr 2022 17:52:06 GMT

Adding more information for my previous comment.

ImageryTileLayer internally uses raster information model, which supports NoData pixels. When a pixel or tile is missing or has a nodata mask, it's required to honor it as NoData. The raster has a resolution (corresponds to finest LOD), and uppersampling happens beyond that --- that's the "overzoom" you can see. This design is consistent with ArcGIS Pro, and consistent with ImageryLayer (if the same elevation cache dataset is published as a dynamic image service) --- when using world elevation 3D service for display. The primary purpose of World elevation3D service is still providing elevation for 3D.

In future, we can look into adding some special logic/flags to handle this in the JS API.

Re: Allow zoom above max level of details ?

devmap126 — Fri, 29 Apr 2022 07:13:13 GMT

wow thruough answer thank you s much. Well then yes the option would be great.

Meanwhile what would you say is my solution to keeo dsiaplying the layer ?

is there some trick / fucntion call I can make from the console that's force things ?

ore ue some other kind of layer ?