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Using featureSet to find the area of one polygon within another

DavidFotheringham1

I've been using the fantastic new featureSet function in Arcade expressions but can't quite work out how, if it is possible, to determine the area of one polygon dataset in another.

As an example, I have vegetation polygons and I wish to determine how much vegetation is within various boundary polygons using Arcade and custom pop-ups.

Any suggestions? Many thanks!

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KristianEkenes

In a future release we'll add support for calculating area for a feature set of features. In the meantime you can do the following:

<SPAN class="keyword token">var</SPAN> allVegetation <SPAN class="operator token">=</SPAN> <SPAN class="token function">FeatureSetByName</SPAN><SPAN class="punctuation token">(</SPAN> <SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN> <SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> vegInBoundary <SPAN class="operator token">=</SPAN> <SPAN class="token function">Intersects</SPAN><SPAN class="punctuation token">(</SPAN> allVegetation<SPAN class="punctuation token">,</SPAN> $feature<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="keyword token">var</SPAN> totalArea <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">for</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">var</SPAN> veg <SPAN class="keyword token">in</SPAN> vegInBoundary<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
   totalArea <SPAN class="operator token">+</SPAN><SPAN class="operator token">=</SPAN> <SPAN class="token function">AreaGeodetic</SPAN><SPAN class="punctuation token">(</SPAN>veg<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"square-meters"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="keyword token">return</SPAN> totalArea<SPAN class="punctuation token">;</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

This workflow is basically covered in this blog post - ArcGIS blog - Create powerful popups in web apps with Arcade feature sets in web apps

All comments

KristianEkenes

In a future release we'll add support for calculating area for a feature set of features. In the meantime you can do the following:

<SPAN class="keyword token">var</SPAN> allVegetation <SPAN class="operator token">=</SPAN> <SPAN class="token function">FeatureSetByName</SPAN><SPAN class="punctuation token">(</SPAN> <SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN> <SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> vegInBoundary <SPAN class="operator token">=</SPAN> <SPAN class="token function">Intersects</SPAN><SPAN class="punctuation token">(</SPAN> allVegetation<SPAN class="punctuation token">,</SPAN> $feature<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

<SPAN class="keyword token">var</SPAN> totalArea <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">for</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">var</SPAN> veg <SPAN class="keyword token">in</SPAN> vegInBoundary<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
   totalArea <SPAN class="operator token">+</SPAN><SPAN class="operator token">=</SPAN> <SPAN class="token function">AreaGeodetic</SPAN><SPAN class="punctuation token">(</SPAN>veg<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"square-meters"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="keyword token">return</SPAN> totalArea<SPAN class="punctuation token">;</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

This workflow is basically covered in this blog post - ArcGIS blog - Create powerful popups in web apps with Arcade feature sets in web apps

KristianEkenes

Sorry, I think I messed up the expression, I edited it now to what I think you're looking for.

DavidFotheringham1

This is perfect and works so well! This opens a lot of doors!

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