Autopopulate UTM (NAD83) coordinates

[AJ_devaccount]

Is it possible to host a NAD 83 (Zone 17N) point feature layer in AGOL, and use that in Field Maps to get GPS metadata such as UTM coordinates (in NAD83) and horizontal accuracy? For the most part we'll be using the default GPS receivers in iPads/tablets/cell phones. And for special cases use an external GPS receiver.

So far from research, it seems only the default WGS lat/long can be recorded?

Thanks very much

[Larry · Accepted solution]

Yes, you can record UTM Zone 17 coordinates.

You have to use a UTM Zone 17 basemap for your map but there is a trick to it.

The Field Maps editor does not like the UTM base map when you are setting up your arcade code so leave the default base map until you have your forms created and then switch the base maps to the UTM one before you save your map and create your offline area.

in each of your form elements for east (.x), north (.y) and elevation (.z)
edit this arcade code to capture the coordinates

// elevation (.z) example arcade
var geom = Geometry($feature)
if (!IsEmpty(geom)) {
return geom.z
} else {
return null
}

[AJ_devaccount]

Thanks very much @Larry, does arcade autopopulate a field, so that when a feature layer is exported, the values will be saved in the field? Or would it just temporarily appear in the pop-ups?

[Larry]

the values are stored in your attribute table the same as any form field that you fill in manually.

[janderson_ksninc]

This is a great script! I need to do the same this but I'm working in WGS84 and would like the coordinates displayed as decimal degrees. Do you have a solution for this?

[Larry]

It's been awhile since I have looked at Arcade but if I am recalling correctly WGS84 Lat/Long in decimal degrees is the default coordinate system if you are using the ESRI basemaps.

Larry

[JamieCooper]

Hi Larry,

Am I only able to create a UTM base map in ArcGIS Pro?

I'm working strictly out of Field Maps Designer/AGOL and am curious how to accomplish this same task. Maybe I'm missing a step, but I created three fields (easting, northing, elevation) in my form, then created a calculated expression in the respective fields with the code you suggested (changing geom.z to geom.y then geom.x). This clearly isn't correct, though, as my exports are still only containing lat/long data.

Thanks,

-Jamie

[Larry]

Hi Jamie,
It's been a few years since I looked at this. I don't think it matters
where you create the base map but you will have to convert it to an esri
tile format before uploading it to agol. Agol uses lat/Long coordinates by
default and to get utm you had to change the base map. That's the way it
worked several years ago but there were rumblings about adding the ability
to set the final coordinate system but I have no idea if it was ever done.
Someone at esri or a question to the forum should be able to answer it for
you.

Larry