topic Re: geometryEngine.geodesicArea bug? in Web AppBuilder Custom Widgets Questions

geometryEngine.geodesicArea bug?

LefterisKoumis — Sun, 12 Dec 2021 10:53:37 GMT

I have this simple code that it displays a graphic. So, geometry is ok. When I attempt to calculate the area of the graphic (line 5) I get this error. Why? Thanks.

var newbuffer = geometryEngine.difference(buffer,polygongeom);
newbuffer.setSpatialReference(new SpatialReference({ wkid: 102110}));
var buffergraphic = new esri.Graphic(newbuffer, bufferSym);

var thebufferarea= geometryEngine.geodesicArea(geometryEngine.simplify(buffergraphic.geometry), 'acres');
console.log(thebufferarea)
bufferGraphicsLayer.add(buffergraphic);‍‍‍‍‍‍‍‍‍‍‍
------------
this.map.addLayer(bufferGraphicsLayer)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

the root of the error is at line 559, which is line 5 above.

Re: geometryEngine.geodesicArea bug?

DanPatterson_Retired — Thu, 08 Nov 2018 11:48:50 GMT

Not implemented isn't a bug, it means it has limitations for its use. It either isn't implemented for graphics or it doesn't like your coordinate system.

For example, the WGS 1984 Web Mercator (Auxiliary Sphere) projection was originally assigned WKID 102100, but was later changed to 3857.

But if is that picky about the renaming, no clue. The python variant of this is similar

This method only works with WGS-84 (wkid: 4326) and Web Mercator (wkid: 3857) spatial references.

esri/geometry/geometryEngine | API Reference | ArcGIS API for JavaScript 3.26

Re: geometryEngine.geodesicArea bug?

RobertScheitlin__GISP — Thu, 08 Nov 2018 14:26:47 GMT

Lefteris,

Have you console logged the newbuffer to be sure it is not null?
What is the spatialReference before you set it to 102100?
Did you try setting to 3857 instead of 102100 (this should not make a difference though)?
Have you logged what the result of geometryEngine.simplify(newbuffer)?

Re: geometryEngine.geodesicArea bug?

LefterisKoumis — Thu, 08 Nov 2018 19:12:14 GMT

Thank you! that was it.

Re: geometryEngine.geodesicArea bug?

LefterisKoumis — Thu, 08 Nov 2018 19:13:12 GMT

Thank you. Changing the Wkid to 3857 made it work!

Re: geometryEngine.geodesicArea bug?

arahman_mdmajid — Thu, 23 Dec 2021 11:38:17 GMT

Thank you for saving the day. Projecting to 3857 worked