Hi all, I am using ODK Collect (1.21.2) and XLS form, and I am designing a form to record locations for field collected insect samples. I'd like each new sampling location (in the same form) to be over a minimum distance from the one before it. Is it possible in the form to 1.Calculate the linea…

You do not need to capture an actual geotrace per se - you can in fact construct a geotrace by simply concat'ing two (independently acquired) geopoints together, separated by a ';', eg concat(${location1}, ';', ${location2}) Try this: geopointdistance.xls (5.5 KB) [33%20PM]

[image] andhulthen: 1.Calculate the linear distance between sample geopoints If you put your two geopoints in a geotrace, you can measure the distance of the trace - ie the distance between the two locations - using the ODK distance() function. After which you can use this value in a constra…

@Xiphware I had considered this, but the sample points need to selected independently, and there are several questions in the form related to sample collection information following the first geopoint selection, and before the selection (and geopoint) of the next sample collection location. Does tha…

Works perfectly. Thanks @Xiphware !

Hello, i try to download the example but appear a message that the site do not exist.

Please is the output in metres?

per distance() : distance(nodeset | geoshape | geotrace) Returns the distance, in meters, of either: a nodeset of geopoints the perimeter of a geoshape the length of a geotrace value ...

Hi @Xiphware thank you this is good. But is there a way I can make the location 1 a constant in all the forms. ie. the enumerator will be coming from the same location(their house) each day to carry out activities, then location 2 is taken at the point of activity. This is so that they do not have …

ODK Forum

Calculate distance between geopoints

Support

odk-xlsform, odk-collect

show post in topic

Home
Categories
Guidelines
Terms of Service
Privacy Policy

Powered by Discourse, best viewed with JavaScript enabled

Looking for a better way? Try ODK Cloud, the official managed hosting service from the creators of ODK.