Let's say I have GPS coordinates of a location and the surveyors need to go there to collect the data. I would like to set up a control so that the data is collected over a radius of 7 km for example. To do the control I have to use the existing GPS coordinates and the collected one. If the difference is 7 km a message appears to inform the surveyor that he has surveyed outside the desired radius.
Has anyone ever done this kind of control. If so, can they help me by sharing a copy of the coding.
Thank
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I started typing up how to construct a geotrace string from your reference point and collected point and use the distance function to calculate what you need while thinking 'I bet @Xiphware has a better solution' and did a quick search...it's the same solution, but saves me the trouble of recreating it 
There's an example form in that thread, you would just need to replace one of the points with your reference location as a string in the concat/variable in the concat, then check that the output is <7000m
Here's the docs on the distance function:
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Sorry for the late reply. I read the discussions I will try the coding.
thanks
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Hi @Nasser,
If you are familiar with geospatial shapefiles, you may also want to consider using the approach to geofencing that I described in a recent post...
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