topic basemap spatial reference in ArcGIS JavaScript Maps SDK Questions

basemap spatial reference

JimHenry — Fri, 15 Dec 2017 18:22:47 GMT

View | API Reference | ArcGIS API for JavaScript 4.6

There is a statement that says "When using an Esri basemap, the default spatial reference is Web Mercator Auxiliary Sphere."

This makes me think that it can be changed? I would like to set to 4326. I can set a custom basemap using a layer with that spatial reference but I want that layer on top.

I have also tried setting the center and extent of the MapView with the spacial reference but I do not get what I would expect.

Re: basemap spatial reference

RobertScheitlin__GISP — Fri, 15 Dec 2017 18:30:54 GMT

Jim,

All esri standard basemaps are in 102100 (Web Mercator Auxiliary Sphere). This not something that can be changed. Basemaps are normally come from a tiled/cached map service which is a collection of images at predefined scales. Based on that fact on the fly re-projection is NOT possible. If you need your map to be in WGS84 for some reason then you will have to use a custom basemap in that projection.

Re: basemap spatial reference

UndralBatsukh — Fri, 10 Dec 2021 22:41:30 GMT

Hi there,

You can use wgs84 esri vector basemaps. Pick one of the webmaps and set your Map's basemap as shown below:

var map = new Map({
  basemap: {
    portalItem: {
      id: "8dda0e7b5e2d4fafa80132d59122268c" //Streets (WGS84)
    }
  }
});‍‍‍‍‍‍‍‍‍‍‍‍‍‍