How do I manipulate with specific linear unit in GeometryEngine.Instance function

Anonymous User

Hi Guys,

How do I manipulate with specific linear unit in GeometryEngine.Instance at specific function.

For example. GeometryEngine.Instane.GeodesicArea([input Geometry), the output seem/support to be derived from SpatialReference unit of geometry. For example, If I want to get output with meter, how should I manipulate.

Is that require to reproject with WGS 84 whenever I want to calculate in meter?

Same thing for 

 GeometryEngine.Instance.GeodesicBuffer, GeometryEngine.Instance.Buffer, => will the distance value derived from spatialreference of the input geometry?

For example. If I want to buffer in kilometer how should I do?

I found some function with the option linear unit in arcgis runtime sdk .net Geodesic Buffer | ArcGIS for Developers 

I think, that could be great if these .net libraries are using the common data transfer object dll.

AnnetteLocke

Hi,

The documentation should say what the input and output units are. 

GeodesicArea always returns square meters. You don't need to project your data. 

ArGIS Pro 2.4 API Reference Guide - GeodesicArea

GeodesicBuffer assumes the distance passed in is in meters. 

ArcGIS Pro 2.4 API Reference Guide - GeodesicBuffer

If you need different units, use the LinearUnit class to convert them. For example, if you want to buffer in kilometers instead of meters, convert the distance from kilometers to meters and then pass that to the GeodesicBuffer method.

LinearUnit kilometers <SPAN class="operator token">=</SPAN> LinearUnit<SPAN class="punctuation token">.</SPAN>Kilometers<SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">double</SPAN> meters <SPAN class="operator token">=</SPAN> kilometers<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ConvertTo</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">100</SPAN><SPAN class="punctuation token">,</SPAN> LinearUnit<SPAN class="punctuation token">.</SPAN>Kilometers<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
Geometry buffer <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GeodesicBuffer</SPAN><SPAN class="punctuation token">(</SPAN>polygon<SPAN class="punctuation token">,</SPAN> meters<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

That being said, we can add methods with a LinearUnit parameter in a future release. Thanks for the suggestion.

Annette