Create points from slope raster?

Question

Problem: identify locations of exposed cliffs and bluffs with a minimum slope angle.  I've created a DSM using 1m lidar and have performed slope analysis.  I'm interested in creating a point feature class that plots points for areas that contain certain slope characteristics.  For example, the attached pic shows slope values 75 degrees or steeper.  I'd like to perform a calculation that looks at the slope raster and assigns points to areas that are likely to contain cliffs that are, perhaps, a certain continuous length and minimum vertical relief.  Put simply, I'm looking for a model that analyzes a dsm and says, 'here's a point that might have a cliff.'  Using ArcGIS Pro 2.9.0

Screenshot 2022-01-17 065102.jpg

danretired · Answer

not without converting to vector

raster zones to vector (eg raster to polygon)

Raster to Polygon (Conversion)—ArcGIS Pro | Documentation

You might need to run a MultipartToSinglePart tool on the above.

Then if you really need just a point in each polygon/raster zone, perhaps

Feature To Point (Data Management)—ArcGIS Pro | Documentation

you perhaps could run

Zonal Geometry (Spatial Analyst)—ArcGIS Pro | Documentation

with the centroid option but that runs the possibility to have to run a RegionGroup to make sure each zone has a unique value (ie you might have several spatially separated zones with the same class)

then convert to point and use those points to extract the values

BrianTickle · Answer

That worked for isolating the slope range!  Thanks.  But do you know if there's a way extract the resulting raster to points without returning a point for every pixel?  Ideally, I'd like to extract a single point for a certain "volume" of slope.  By volume, I mean a certain count of contiguous pixels.  So, if in the slope raster I have one section of the raster with 100 contiguous pixels and another section with only 99 contiguous pixels, I'd like to extract only 1 point to be placed somewhere in the 100 pixel area.  Hopefully that makes sense.

danretired · Answer

have you tried query your slope raster to identify slopes within your desired slope range, using the Con statement or SetNull

Setting values to NoData with Set Null—ArcGIS Pro | Documentation

OutRas = SetNull(SlopeRaster <= ??, InRas1)

then extract to points

Raster to Point (Conversion)—ArcGIS Pro | Documentation