Save Location with Offset

SkylerKasko — Thu, 17 Mar 2022 16:30:11 GMT

Is there any way to save a location that is offset from a geopoint as the geometry of a survey record?

For example, if I wanted my survey points to be shifted by 1 degree of latitude from the coordinates captured by my device, my first thought would be to calculate an offset location in a second geopoint question:

type	name	label	calculation	bind::esri:fieldType
geopoint	gps_location	GPS Location		null
decimal	gps_latitude	GPS Latitude	pulldata("@geopoint", ${gps_location}, "y")	null
decimal	gps_longitude	GPS Longitude	pulldata("@geopoint", ${gps_location}, "x")	null
geopoint	offset_location	Offset Location	string(${gps_latitude} + 1) + " " + string(${gps_longitude})

(In reality I wouldn't be adding a hardcoded offset; I would be calling a custom JavaScript function, passing in ${gps_location}, and returning the desired coordinates for the offset location, but those details are not relevant.)

Unfortunately, this does not work because Survey123 can only save survey records' geometries based on the first geopoint question encountered, as explained in this answer. Indeed, if I publish this survey and try submit a record, I get the following error:

Send Error
This survey could not be sent due to the following error:
No mapping exists from object type ESRI.ArcGIS.Client.Geometry.MapPoint to a known managed provider native type.

Given that this doesn't work, is there any other solution for saving the geometry by calculating coordinates based on the device's location?

Re: Save Location with Offset

SkylerKasko — Thu, 17 Mar 2022 18:56:33 GMT

It turns out all I needed to do is switch the order of the two geopoint questions! I did not realize that calculations in Survey123 can use values of questions defined later in the form. Taking the example in my original post, the following modification works:

type	name	label	calculation	bind::esri:fieldType
decimal	gps_latitude	GPS Latitude	pulldata("@geopoint", ${gps_location}, "y")	null
decimal	gps_longitude	GPS Longitude	pulldata("@geopoint", ${gps_location}, "x")	null
geopoint	offset_location	Offset Location	string(${gps_latitude} + 1) + " " + string(${gps_longitude})
geopoint	gps_location	GPS Location		null

It doesn't seem ideal to arrange the questions in such a nonintuitive order, but at least it works.

topic Re: Save Location with Offset in ArcGIS Survey123 Questions

Save Location with Offset

Re: Save Location with Offset