topic Compare and Average Surrounding DEM Cells and Return Values in Data Management Questions https://community.esri.com/t5/data-management-questions/compare-and-average-surrounding-dem-cells-and/m-p/369345#M21007 <HTML><HEAD></HEAD><BODY><SPAN>I have a 10m DEM of a project area that I need to reclass into three slope positions: canyon, mid-slope and ridge top.&nbsp; This was a previously executed analysis that I need to re-create.&nbsp; The process previously used was:</SPAN><BR /><BR /><SPAN style="font-style:italic;">Compare the height of each cell in the DEM with the average of the surrounding cells in a 50m radius neighborhood.&nbsp; If the target cell was 25m higher than the average of the surrounding cells, that cell was classed as a ridge (and I'm guessing this means '25m or higher'). If the cell was 20m lower than the target cell, then it's classed as a canyon.&nbsp; All remaining were classed as mid-slope.</SPAN><BR /><SPAN>(this description was taken directly out of the paper that was previously produced). </SPAN><BR /><BR /><SPAN>While I have a general idea of how this should work, I don't have a real idea </SPAN><SPAN style="text-decoration:underline;">how</SPAN><SPAN> to do it (I'm not a programmer) and its been ages since I've done this type of grid analysis. </SPAN><BR /><BR /><SPAN>Any advice, hints, tips etc would be much appreciated.&nbsp;&nbsp; Heather</SPAN></BODY></HTML> Thu, 13 May 2010 19:05:45 GMT HeatherTaylor 2010-05-13T19:05:45Z Compare and Average Surrounding DEM Cells and Return Values https://community.esri.com/t5/data-management-questions/compare-and-average-surrounding-dem-cells-and/m-p/369345#M21007 <HTML><HEAD></HEAD><BODY><SPAN>I have a 10m DEM of a project area that I need to reclass into three slope positions: canyon, mid-slope and ridge top.&nbsp; This was a previously executed analysis that I need to re-create.&nbsp; The process previously used was:</SPAN><BR /><BR /><SPAN style="font-style:italic;">Compare the height of each cell in the DEM with the average of the surrounding cells in a 50m radius neighborhood.&nbsp; If the target cell was 25m higher than the average of the surrounding cells, that cell was classed as a ridge (and I'm guessing this means '25m or higher'). If the cell was 20m lower than the target cell, then it's classed as a canyon.&nbsp; All remaining were classed as mid-slope.</SPAN><BR /><SPAN>(this description was taken directly out of the paper that was previously produced). </SPAN><BR /><BR /><SPAN>While I have a general idea of how this should work, I don't have a real idea </SPAN><SPAN style="text-decoration:underline;">how</SPAN><SPAN> to do it (I'm not a programmer) and its been ages since I've done this type of grid analysis. </SPAN><BR /><BR /><SPAN>Any advice, hints, tips etc would be much appreciated.&nbsp;&nbsp; Heather</SPAN></BODY></HTML> Thu, 13 May 2010 19:05:45 GMT https://community.esri.com/t5/data-management-questions/compare-and-average-surrounding-dem-cells-and/m-p/369345#M21007 HeatherTaylor 2010-05-13T19:05:45Z