Using location from field maps in survey123

SeanOTooleCT

I have a field map with a point layer and when a user selects a point, the pop up contains a link that launches survey123 and automatically fills in some of the survey fields based on information from field maps using the field:fieldname parameter. I assumed that the location of the point in field maps would be used as the location of the entry in survey123, but instead it uses the user's location. Is there a way to use the field maps point location as the survey123 location?

JosephRhodes2

Hi Sean, here's how we do that:

Add &center=<lat>,<long> to the end of the link that opens Survey123 (ex: &center=40.3798956137812,-122.98043757805).
On the geopoint question in your survey's XLSform, set required=yes, readonly=yes, and default=null.

You'll need to use an Arcade expression to get the lat-long values. If your Field Maps point data happens to be in 4326 (WGS 84), you can just add

"&center=" + Geometry($feature).y + ',' + Geometry($feature).x

to the expression that builds your link (or if you happen to already have lat/long values elsewhere in the table, you can just use those, of course).

If your Field Maps point data is in another projection, it gets a bit trickier because you have to convert to lat/long. Let me know if this is the case and I'll see if I can help you convert those values in your popup.

View solution in original post

ChristopherCounsell

@JosephRhodes2 is correct with the URL values, but if your data is in WGS84 (Web Meractor) the Geomtetry($feature) returns projected coordinates instead of the necessary decimal degrees. You'll need to convert them.

function MetersToLatLon(x, y) {
    var long = (x / 20037508.34) * 180;
    var lat = (y / 20037508.34) * 180;
    lat = 180.0 / PI * (2.0 * Atan( Exp( lat * PI / 180.0)) - PI / 2.0);
    return{
        y: lat,
        x: long
    }
}
var latlon = MetersToLatLon(Geometry($feature).X, Geometry($feature).Y);

// assuming you have a URL already and adding parameters
url = url + "&center=" = latlon.y + "," + latlon.x

Other examples of that here and elsewhere on the community forums

https://support.esri.com/en-us/knowledge-base/how-to-launch-and-populate-a-survey123-for-arcgis-surv...