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Impact of DEM Resolution on Hydrologic Derivatives: A Multi-location Study in Indiana, South Carolina, and Colorado

This study examines the influence of digital elevation model (DEM) resolution on hydrologic derivatives in various watersheds across Indiana, South Carolina, and Colorado. The research involves assessing elevation accuracy and watershed characteristics at different resolutions to determine the effect of terrain on hydrologic modeling accuracy. The methodology includes data download, processing in UTM, delineation, comparison with survey data, and evaluation of the impact on watershed characteristics.

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Impact of DEM Resolution on Hydrologic Derivatives: A Multi-location Study in Indiana, South Carolina, and Colorado

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  1. Effect of DEM Resolution on Global Hydrologic Derivatives Jim Monty

  2. Case study locations • Decided on watersheds in Indiana, South Carolina, and Colorado

  3. Location Comparisons

  4. The work….so far • Downloaded all DEM’s, checked for coverage • Converted all data to UTM • Started first steps for all 12 datasets • Slight issue with the Colorado 90 DEM Utilized “IsNull” and “Con” tools to eliminate missing data

  5. AOI Selection

  6. Next steps • Complete delineations for each dataset • For each resolution, compare elevations within the DEM against a base elevation set of survey data to compute RMSE • Compute watershed characteristics for several different thresholds to compare effects of resolution • Does the terrain have an effect?

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