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Effect of DEM Resolution on Global Hydrologic Derivatives

Effect of DEM Resolution on Global Hydrologic Derivatives. Jim Monty. Case study locations. Decided on watersheds in Indiana, South Carolina, and Colorado. Location Comparisons. The work….so far. Downloaded all DEM’s, checked for coverage Converted all data to UTM

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Effect of DEM Resolution on Global Hydrologic Derivatives

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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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