topic Re: Area calculation in ArcGIS Survey123 Questions

Area calculation

FernandoRuiz_Gámez — Wed, 25 Sep 2024 15:52:26 GMT

The default reference system in survey 123 is WGS84. If we calculate the area using the area() function the resulting value is a geodesic area. How to calculate a planar area.

Re: Area calculation

abureaux — Wed, 25 Sep 2024 21:16:11 GMT

Feature Reports can choose between planar or geodesic area. Source here.

getValue

length, area, unit, measurement type

geotrace, geoshape

Map

Returns the length of a polyline, or the perimeter or area of a polygon, in given units and whether the measurements are planar or geodesic. Default measurement type is geodesic.

From that same document:

For geotrace and geoshape questions, you can use the getValue expression to display the length of the line or the perimeter of the polygon, respectively:
${polyline1 | getValue:"length":"meters":"planar"}
For geoshape questions, you can also use the getValue expression to display the area of the polygon:
${polygon1 | getValue:"area":"hectares":"geodesic"}

As for within the actual Field App... I actually can't find a reference to these parameters.

Re: Area calculation

FernandoRuiz_Gámez — Wed, 25 Sep 2024 21:48:40 GMT

I really need the data to be saved in a field. Not that I create any other ideas when generating the report @I really need the data to be saved in a field. Not that it creates any other ideas when generating the report @AI really need the data to be saved in a field. Don't let me create it when generating the report. Any other ideas @abureaux?

Re: Area calculation

FernandoRuiz_Gámez — Wed, 25 Sep 2024 21:52:30 GMT

@abureaux, Perhaps the r system could be changed.Maybe you could change the reference system but I didn't find how to define it in XML forms either.