topic Re: Geopoint pulldata XY values in local coordinate system in ArcGIS Survey123 Questions

Geopoint pulldata XY values in local coordinate system

mddelossantos — Mon, 28 Feb 2022 00:31:55 GMT

Hi all

I'm trying to capture coordinate values on the field using Survey123.

I used the pulldata function for the field calculation. For example:

pulldata("@geopoint", ${pumploc}, "x",)
pulldata("@geopoint", ${pumploc}, "y")

It is working fine, however, it captures coordinate values by default in WGS84. We would like capture these values in a local coordinate system (e.g., GDA94)

Is this possible? If so, what should I add to the calculation?

Re: Geopoint pulldata XY values in local coordinate system

shan_sarkar — Mon, 28 Feb 2022 05:26:04 GMT

Hi @mddelossantos ,

Check out Pulling data from geopoint questions

In this they have mention that

Survey123 never works with projected coordinates: geopoint values are always in geographic coordinates using WGS84

Re: Geopoint pulldata XY values in local coordinate system

HuubZwart — Mon, 28 Feb 2022 06:07:24 GMT

You could add a javascript function to project the coordinates you obain from pulldata/geopoint questions to your local coordinate system. For example using the Project geometry service from ArcGIS rest.

Re: Geopoint pulldata XY values in local coordinate system

DerrickWestoby — Wed, 02 Mar 2022 18:23:39 GMT

Using a JS script in-app like @HuubZwart recommended is probably the "cleanest" way to do this, but difficult.

An easier option, if the limitations are acceptable, would be to print them out in a feature report in a different spatial reference. I'm not sure what the WKID of GDA94 is, but you could replace 4326 with that and then print out your points in a table that could be easily copy and pasted into a CSV file to import elsewhere.

Feature	Lat (4326)	Lon (4326)	Elevation (Meters)
${feature_number}	${location \| getValue:"y":4326}	${location \| getValue:"x":4326}	${location \| getValue:"z"}

(I had some of my surveys set up this way before I figured out how to auto-export directly to a CSV)

Relevant help doc - https://doc.arcgis.com/en/survey123/browser/analyze-results/featurereporttemplates.htm