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Extracting Raster Sub Datasets and Converting to Polygon

Question asked by khanne228 on Dec 28, 2015
Latest reply on Dec 30, 2015 by khanne228

Hello all,


I am doing a comparison between two surfaces, the determining how much of that surface has changed within the floodplain I have delineated in this area.   The original was flown in 1998 and the newer one was flown in 2012.  I was able to use the Raster Math tool to determine exactly where and by how much the surface has changed above or below the original elevation. 


I was able to manually break the symbology to show what portion of the surface has gone down 2 feet or more from the original, but here I get stuck.  I need a way to extract only that portion of the raster, then convert it to a polygon and quantify area of -2ft. change within the floodplain. 


Does anyone have any suggestions?  I am stumped here.  Any help would be greatly appreciated.  Thank you!