topic Re: AreaMeasurement2D in ArcGIS JavaScript Maps SDK Questions

AreaMeasurement2D

AbdelrahmanAbdelrazek — Thu, 10 Jan 2019 13:50:51 GMT

Hello,

I'm using esri js api v 4.10. and when i use the area measurement widget ( AreaMeasurement2D ) the result is not correct in Auto mode (planar mode as i measure features have perimeter less than 100 km) but when i switch the mode to geodesic the area is semi accurate.

Pls find attached files.

The real area for this polygon is (479.304 Arces).

Thanks in advance.

Re: AreaMeasurement2D

Noah-Sager — Thu, 10 Jan 2019 18:57:57 GMT

Hi Abdelrahman Abdelrazek, the geodesic mode is the more appropriate (accurate) mode in this scenario. From our doc:

"When using input geometries with a spatial reference of either WGS84 (wkid: 4326) or Web Mercator, it is best practice to calculate areas using geodesicArea()."

geometryEngine | API Reference | ArcGIS API for JavaScript 4.10

We will be updating the behaviors of the 2D measurement widgets in the upcoming release to make this less confusing. Hope this helps.

-Noah

Re: AreaMeasurement2D

AbdelrahmanAbdelrazek — Thu, 10 Jan 2019 19:04:44 GMT

Thank you so much for this clarification.

Noah Sager‌