While I creat flood areas using DEM in ArcGIS, Which parameters do I consider to determine DEM's pixel size and resolution?


DEM pixel size is based of your topographic map scale . DEM pixel size that calculate using topographic map with 1:25000 scale has 10 * 10 meters pixel size. For 1:50000 scale the pixel size must be 20*20 meters and so on.

consider the below links :

What are appropriate pixel resolutions for DEMs based on source map scales?

Mathematical relationships among map scale, raster data resolution, and map display resolution

  • I know that. But I think it is not only map scale. – zeynep Oct 23 '14 at 8:00
  • please see the links . – BBG_GIS Oct 23 '14 at 8:09
  • Actually I see some studies used 7.5*7.5 pixel size. So, I thought map scale is not only parameter for these studies. – zeynep Oct 23 '14 at 8:19
  • @zeynep - pixel resolution is an irrelevant parameter and independent of raster resolution. When you export a map at HIGH resolution the raster contained with the exported output will have a HIGH pixel resolution. As such you can export a 20cm resolution LiDAR DEM at letter size and 72DPI and the resulting file will have a low pixel resolution. Similarly, a coarse 30m resolution DEM exported to an ANSI E size and 300DPI will have a extremely high pixel resolution but it will not change that fact that the DEM will still be a 30m raster resolution. – Jakub Sisak GeoGraphics Oct 23 '14 at 16:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.