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Comparing GPS coordinates in Survey123

newwollyka

Is there a way in Survey123 to compare the spatial distance in meters between 2 GPS coordinates (on fixed GPS coordinates and the other one is the actual location of the device/enumerator)?

If the distance is, say, more than 30m, show an error message "You are far away, please go to the designated location"?

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Accepted answers

dougbrowning

Here I send in the DesignLat/Long and compare to the current (which someone called easting/northing and it drives me nuts). Can compare any 2 with it.

round(acos(sin(${Northing} * pi() div 180)*sin(${DesignLat} * pi() div 180) + cos(${Northing} * pi() div 180)*cos(${DesignLat} * pi() div 180)*cos((${DesignLong} * pi() div 180)-(${Easting} * pi() div 180))) * 6371000,2)

meters

All comments

dougbrowning

I think you can hide the GPS question using the new body::esri:visible column.

newwollyka

Thanks for the explanation. On a side note, can we collect the GPS automatically (hidden way) without showing or clicking on the GPS button or map in the form (using the field app)?

dougbrowning

Yes do not use center just send them as text into a field in the form. Then have a second set of lat/long using pulldata to get the form GPS lat/long. Then compare those 2 fields. Sorry that was not clear.

newwollyka

Doesn't the center (&center=43.567,-117.380) in the custom URL sets ALL the geopoint questions to those coordinates? In that case, should I sent those coordinates from the Collector app to a text field in Survey123 and then compare?

dougbrowning

I send these using a URL. Just send it into a field in the form then compare.

newwollyka

Thanks

Does it work if one of those GPS coordinates (DesignLat/Long) are taken from Collector app through a custom URL scheme using the &center or Survey123 will be lost here?

dougbrowning

Here I send in the DesignLat/Long and compare to the current (which someone called easting/northing and it drives me nuts). Can compare any 2 with it.

meters

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