topic Re: Basemap with different projection in ArcGIS JavaScript Maps SDK Questions

Basemap with different projection

ADITYAKUMAR1 — Thu, 04 May 2023 13:01:54 GMT

Hi,

I am trying to add basemap with different projections to my map while map load.

baseLayer = new TileLayer({ url: baseMapService.MapServiceURL });

var myBasemap = new Basemap({

baseLayers: [baseLayer ],

thumbnailUrl: baseMapService.MapServiceURL + '/info/thumbnail',

title: 'My custom basemap', id: 'my_custom_basemap' });

map.basemap = myBasemap

The above code works fine when the base map projection is similar to the projection of base map gallery. But does not work with different projection.

Any idea.

Thanks

Aditya Kumar

Re: Basemap with different projection

UndralBatsukh — Thu, 04 May 2023 15:42:39 GMT

Hi there,

I am not sure what issue you are running into. Can you please explain the problem bit more in detail? If you are using 4.23 and later, you can change spatialReference of the MapView at runtime. Here are the details how it works: https://developers.arcgis.com/javascript/latest/4.23/#basemaps-with-different-spatial-references

Re: Basemap with different projection

ADITYAKUMAR1 — Thu, 04 May 2023 15:51:21 GMT

Hi @UndralBatsukh ,

Thanks for the response. I am trying to add a custom basemap to the map on map load. Below is the code I am using for same.

baseLayer = new TileLayer({ url: baseMapService.MapServiceURL });

var myBasemap = new Basemap({

baseLayers: [baseLayer ],

thumbnailUrl: baseMapService.MapServiceURL + '/info/thumbnail',

title: 'My custom basemap', id: 'my_custom_basemap' });

map.basemap = myBasemap

But on map load the basemap is not loading.Its coming without a basemap.

Thanks

Aditya Kumar

Re: Basemap with different projection

UndralBatsukh — Thu, 04 May 2023 18:08:55 GMT

It is hard to suggest things to try without a repro case. What happens if you set the basemap in the map constructor?

It is blank perhaps because your TileLayer cannot be reprojected to the spatialReference of the view.spatialReference. The server must be able to reproject the TileLayer to match the spatialReference of the view.

Re: Basemap with different projection

ADITYAKUMAR1 — Mon, 08 May 2023 12:40:24 GMT

@UndralBatsukh Exactly. I am getting a blank basemap because the basemap is not getting reprojected

Re: Basemap with different projection

UndralBatsukh — Mon, 08 May 2023 15:24:01 GMT

TileLayer needs to be reprojected on the server. If the server does not support the projection of the mapview then nothing will be displayed.

Re: Basemap with different projection

ADITYAKUMAR1 — Mon, 15 May 2023 15:07:24 GMT

@UndralBatsukh I just managed to solve it by changing the mapview projection to basemap projection.

if(view.spatialrefrence != basemap.spatialrefrence)

{

view.spatialrefrence = basemap.spatialrefrence;

}