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

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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

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