limit the distance between user location and the captured data

Question

Hi all,

can I limit the distance between the user's location and the captured feature, for example: the user must be within a distance of 5meter from the captured feature?

dougbrowning · Answer

Design Lat long is where they are supposed to be.  Prob would be surveying location in you case.  You are just comparing one lat/long pair to the other.

This is all Arcade in the webmap.

Sounds like you need to read up on using Arcade in web maps that you use in Field Maps.   You should also look into Survery123 as this sounds a bit compilated for FieldMaps.

Hala_Ghareeb · Answer

Sorry, but could you please explain where did you write this expression ? In Field maps expressions or in field calculations of the field in the web map? What do you mean by "DesignLat" & "DesignLong"?

Just a note: the field worker's location and the surveying feature location, both of them, are dynamic and changed from a place to another.

dougbrowning · Answer

Just convert the formula above to arcade like this

var originShift = 2.0 * PI * 6378137.0 / 2.0;
var lon = (Geometry($feature).x / originShift) * 180.0;
var lat = (Geometry($feature).y / originShift) * 180.0;

lat = 180.0 / PI * (2.0 * Atan( Exp( lat * PI / 180.0)) - PI / 2.0);

return Round(Acos(Sin(lat * PI / 180)*Sin($feature.DesignLat * PI / 180) + Cos(lat * PI / 180)*Cos($feature.DesignLat * PI / 180)*Cos(($feature.DesignLong * PI / 180)-(lon * PI / 180))) * 6371000,2)

It basically calcs the lat, long of the point then compares to the static lat/long they were supposed to go to.

You can then add a if if you want.  Like if distance>5 then return Warning you are too far type message.

Hope that helps.