topic Re: ArcGIS 3.0.3 - centroid x and y expressions not consistent ArcGIS Pro vs Portal? in ArcGIS Pro Questions

ArcGIS 3.0.3 - centroid x and y expressions not consistent ArcGIS Pro vs Portal?

VincentLaunstorfer — Fri, 03 Feb 2023 15:35:12 GMT

In ArcGIS Pro, I made 2 simple Arcade expressions to display lat and long in PopUps for polygons centroids.

Centroid($feature).x and Centroid($feature).y

As the layer is in WGS84, I get nice decimal degrees coordinates for centroids in pop-ups

Once published as a Hosted layer, the same pop-ups using same Arcade expressions display funny coordinates, like some sort of projected coordinates in meters/feets

Is it normal behavior? Is there any way to force Arcade in Portal to display decimal degrees in WGS84?

Re: ArcGIS 3.0.3 - centroid x and y expressions not consistent ArcGIS Pro vs Portal?

jcarlson — Fri, 03 Feb 2023 15:47:42 GMT

The post-publishing coordinates are showing Web Mercator units. When you ask for coordinates in a web map, it will use the coordinates of the web map's projection, not the layer.

It is possible to get AGOL to open a WGS84 basemap, thus altering the map's projection, and your same expression would return decimal degrees.

Re: ArcGIS 3.0.3 - centroid x and y expressions not consistent ArcGIS Pro vs Portal?

VincentLaunstorfer — Fri, 03 Feb 2023 15:57:33 GMT

I thought about the web-Mercator projection, it makes sense although not handy! In Arcade, I wonder if there is any function to translate the web-Mercator coordinates back to WGS84 decimal degrees...? Something like GeodeticX and GeodeticY, just like AreaGeodetic functions...

Re: ArcGIS 3.0.3 - centroid x and y expressions not consistent ArcGIS Pro vs Portal?

jcarlson — Fri, 03 Feb 2023 16:10:31 GMT

There isn't a built-in one (though that would be really handy!) But you can find a really nice function that @XanderBakker posted over here, which I am pasting with modifications below:

function MetersToLatLon(x, y) { var originShift = 2.0 * PI * 6378137.0 / 2.0; var lon = (x / originShift) * 180.0; var lat = (y / originShift) * 180.0; lat = 180.0 / PI * (2.0 * Atan( Exp( lat * PI / 180.0)) - PI / 2.0); return [lat, lon]; }‍‍‍‍‍‍‍‍‍‍‍ var c = Centroid($feature) var coords = MetersToLatLon(c.x, c.y) return Concatenate(coords, '\n')

Re: ArcGIS 3.0.3 - centroid x and y expressions not consistent ArcGIS Pro vs Portal?

VincentLaunstorfer — Tue, 14 Feb 2023 15:45:12 GMT

Thanks (@XanderBakker too). It really helped.In addition, I used a simple if statment in order to display WGS84 lat/lon in decimal degrees in ArcGIS Pro, and once published to Portal using the MetersToLatLon function.

IIf(centroid($feature).x <= 180 && centroid($feature).x >= -180, centroid($feature).y + ',' + centroid($feature).x, MetersToLatLon(centroid($feature).x, centroid($feature).y)[0] + ',' + MetersToLatLon(centroid($feature).x, centroid($feature).y)[1]);