topic Re: Get xy coordinates when a point is created in ArcGIS Field Maps Questions

Get xy coordinates when a point is created

janderson_ksninc — Thu, 02 Feb 2023 17:26:17 GMT

I have a client who wants to have the xy coordinates display in the popup window when a new point is collected. I have set up fields to hold the x and y coordinates. I've tried to write an expression to get the x coordinate and add the value to the x coordinate field and the same for the y coordinate field but have had no luck. Is this possible? If so, does someone know an expression that I could use to get the xy coordinates of a newly created point?

Re: Get xy coordinates when a point is created

janderson_ksninc — Thu, 02 Feb 2023 23:28:38 GMT

So I've been able to find an expression that gets the x and y coordinates and saves them to attribute fields with the following formula (edited as necessary for lat/long):

var geom = Geometry($feature)
if (!IsEmpty(geom)) {
return geom.x
} else {
return null
}

Unfortunately, the results are shown in meters and I need them in decimal degrees. Does anyone have a way to make this happen? From what I understand, it is not a straight-forward calc like converting pixels values from meters to feet in a raster. However, I may be wrong. Could someone please help me resolve this issue?

Re: Get xy coordinates when a point is created

janderson_ksninc — Fri, 03 Feb 2023 22:44:25 GMT

For all of those who were sitting on the edge of their seats waiting for a solution, here is the script to get the xy coordinates and display in decimal degrees:

//To populate X coordinate in decimal

function MetersToLon(x) {

    var originShift = 2.0 * PI * 6378137.0 / 2.0;

    var lon = (x / originShift) * 180.0;
        
    return Round(lon, 3);
}

return MetersToLon(Round(Geometry($feature).X, 6));

//To populate Y coordinate in decimal:

function MetersToLat(y) {

    var originShift = 2.0 * PI * 6378137.0 / 2.0;

    var lat = (y / originShift) * 180.0;

    lat = 180.0 / PI * (2.0 * Atan( Exp( lat * PI / 180.0)) - PI / 2.0);
    return Round(lat,3);
}
return MetersToLat(Round(Geometry($feature).Y, 6));

Here is the article that I got the script from. Thanks esri support for helping me resolve this issue!
How To: Calculate XY values using an Arcade expression in ArcGIS Pro (esri.com)

Re: Get xy coordinates when a point is created

LayerItOn — Wed, 04 Jun 2025 17:36:50 GMT

Another variation if you need the centroid coordinates of a polygon:

Arcade expression that works in Field Maps:

// Create a function to convert meters to latitude and longitude
function MetersToLatLon(geometry) {
if (IsEmpty(geometry)) {
return [null, null];
}
var originShift = 2.0 * PI * 6378137.0 / 2.0;
var lon = (geometry.x / originShift) * 180.0;
var lat = (geometry.y / originShift) * 180.0;
lat = 180.0 / PI * (2.0 * Atan( Exp( lat * PI / 180.0)) - PI / 2.0);
return [Round(lat, 6), Round(lon, 6)];
}

// Function to get latitude from the centroid
function CentroidLatitude(feature) {
var centroid = Centroid(feature);
return MetersToLatLon(centroid)[0]; // Latitude
}

// Function to get longitude from the centroid
function CentroidLongitude(feature) {
var centroid = Centroid(feature);
return MetersToLatLon(centroid)[1]; // Longitude
}

// Call each function separately
CentroidLatitude($feature);
CentroidLongitude($feature);