# How to calculate percentage of selected area from DEM?

I am working with elevation data and performed a local operation to convert it from meters to feet.

I am interested in finding the area (expressed in percentage) that is above 4,000 feet, but I am having difficulty recalling how to do this.

• possible duplicate of Measuring area of raster classes? – Chris W Nov 26 '14 at 19:30
• @ChrisW This relates to floating point elevation data, which is different than integer raster data in your possible duplicate example. I recommend keeping this open. – Aaron Nov 26 '14 at 19:39
• @Aaron Actually the original data in that question (KD raster output) was floating point (see Fezter's answer and comments on it). A couple of the solutions specifically mention reclassifying it, which is pretty much the same thing both answers here do (albeit with different methods). In my opinion, it's still a duplicate. The primary difference is there's only two classes here - above and below target elevation. – Chris W Nov 26 '14 at 20:02
• @ChrisW Good call, KDE output is floating point. However, we cannot be certain that the KDE was not converted to integer based on the title of the post "measuring area of raster classes". Best to keep both posts and play it safe in my opinion; – Aaron Nov 26 '14 at 20:20
• @Aaron Um, I'm the one that edited the title of that question in order generalize it specifically so that it could be used as a canonical question for in the future, like this one. The original title specified direct KDE output, as does the current question body. Your own answer's first step is to Reclassify. Not every duplicate has to be closed, and if we want both that's fine. But the methods outlined in either question will solve the problem. Actually with the question itself (raster area) and my answer there (possibly the Python one too) integer or floating point is irrelevant. – Chris W Nov 26 '14 at 20:33