How to create a polygon of area above a certain grade from Slope Raster in ArcGIS Pro

[andrewmulford123]

I am hoping to get from a slope raster (calculated from a 10m resolution DEM) to a polygon of areas above a certain grade (58%). I am using ArcGIS Pro 3.1. I have used the Raster Calculator tool to remove decimal places in my raster values and then run the INT tool to convert it to Integer. Now I need to remove values below 58% before using the Raster to Polygon tool. I am unclear on how to do this. Should I use the Raster Calculator tool?

[DavidPike · Accepted solution]

Run your slope analysis https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/slope.htm (percent rise)

Reclassify https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/reclassify.htm to set >=58 raster values to Null, 0 or NoData and <58 values to a single value i.e. 1 or you may find it easier to use the Con tool instead of reclassify https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/con-.htm i.e. Con(InRas1, 1, 0, "Value >58")

The Raster to Polygon https://pro.arcgis.com/en/pro-app/latest/tool-reference/conversion/raster-to-polygon.htm 

[andrewmulford123]

Thanks David! That worked, I used the reclassify tool and then raster to polygon tool.