Area of GPS measurements

[karimp54]

Bonjour à tous,
Je voudrais savoir comment peut-on accéder aux superficies des mesures collectées kobotoolbox area ?

En effet, j’ai collecté des données de mesures de surface avec KoBoToolbox area, malheureusement, lorsque je télécharge le fichier XLS, les superficies des surfaces collectés n’apparaissent pas. Aussi, ne sont-elles visibles sur kobotoolbox.

Merci d’avance pour votre réponse

[Kal_Lam]

Welcome to the community, @karimp54! Have you tried the approach discussed in our previous post? It should help you solve your issue:

Calculating area using geoshape question type

If you wish to calculate an area using the geoshape question type, try designing your xlsform as follows: In the survey tab of your xlsform: [image] Reference xlsform: Area Calculation.xls (26 KB)

This one too:

Adding multiple areas in KoBoToolbox

@carlos_diaz1978, maybe you could do it as outlined in the image shared below: In the survey tab of your xlsform: [Image 1] Data entry screen as seen in Enketo: [Image 2] Data entry screen as seen in Enketo: [Image 3] Reference xlsform: Area Calculation.xls (27 KB)

[karimp54]

Merci pour votre aide !
J’ai encore besoin de votre précieuse aide.
En effet, je voudrais savoir comment exporter les polygones GPS sur kobotoolbox ?

[Kal_Lam]

Have you gone through our support article Exporting and Downloading Your Data? It should guide you how to download your data KML format.

[karimp54]

Hello sir,
Sorry for the inconvenience !
The formula you have calculated for me is the GPS points in square meters. I would like a formula to calculate square meter in hectare to have the area of ​​the surface mapped.

So I could know the mapped area after taking polygon.

Thanks in advance for help!

[stephanealoo]

Hi,
You can always add an additional calculate question that does the conversion of one metric to another using common references for area e.g 1 square meter is equal to 0.0001 hectares. In that calculate question you simply multiply the results by 0.0001 hectares. I suggest you try this and see if solves your issue.
Stephane