control the distance between the field worker's location and the surveying feature

[HalaAbdelmaksoud]

Hi all,

can I control the distance between the field worker's location and the surveying feature, for example: the user must be, at maximum, within a distance of 5meter from the surveying feature?  

To make sure that the field worker is at the location of the surveying feature.

[DougBrowning]

Yes I do it by passing in the lat long they were supposed to go to from Field Maps.  Then I calc the distance from that to where they are in currently from the form.  Then I set a constraint on that distance.

Formula for distance is

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

Hope that helps