Calculating slope in a polygon

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04-15-2024 05:13 PM
JoelHolland
New Contributor

I am currently using the most up to date version ArcGIS Online.  What I would like to do is calculate slope over a certain percentage (35%) within a given polygon.  I just need the acreage or square footage of the areas above 35% slope within that polygon.  This is for project planning.  I found one similar post, but it is 12 years old and I wonder if some of the functions or processes have changed since then.  Thank you to any and all who spend any of their time on this.

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DanPatterson
MVP Esteemed Contributor

Not in AGOL but in Pro, several ways, perhaps

isolate the polygon raster values using

Extract by Mask (Spatial Analyst)—ArcGIS Pro | Documentation

From there you the raster calculator

"slope" > 35

assuming slope is already in percent and the slope raster is so named

Raster Calculator (Spatial Analyst)—ArcGIS Pro | Documentation


... sort of retired...

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DanPatterson
MVP Esteemed Contributor

Not in AGOL but in Pro, several ways, perhaps

isolate the polygon raster values using

Extract by Mask (Spatial Analyst)—ArcGIS Pro | Documentation

From there you the raster calculator

"slope" > 35

assuming slope is already in percent and the slope raster is so named

Raster Calculator (Spatial Analyst)—ArcGIS Pro | Documentation


... sort of retired...
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JoelHolland
New Contributor

Thank you very much

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