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Terrain Generalization : Recommendations

Terrain Generalization : Recommendations. 3 breaks 24K – 250K 250K – 750K 750K – 1M Processing Steps 10m DEM, smoothed once (LGDEM) 10m DEM, smoothed 10 times (MDDEM) 30m DEM aggregated, smoothed 10 times (SMDEM). Grand Canyon Rugged Terrain. 24 50 100 250 500 750 1M.

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Terrain Generalization : Recommendations

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  1. Terrain Generalization : Recommendations • 3 breaks • 24K – 250K • 250K – 750K • 750K – 1M • Processing Steps • 10m DEM, smoothed once (LGDEM) • 10m DEM, smoothed 10 times (MDDEM) • 30m DEM aggregated, smoothed 10 times (SMDEM)

  2. Grand Canyon Rugged Terrain 24 50 100 250 500 750 1M 10-L 10-1 10-5 10-10 10-15 30-L 30-1 30-5 30-10 30-15

  3. Close up Example of Decisions 24K 50K 250K 500K 1M

  4. Detail X  X  1M correct 1M using 24K processing

  5. Close up Example of Decisions 24K 50K 250K 500K 1M

  6. Close up Example of Decisions 24K 50K 250K 1M 500K

  7. Close up Example of Decisions 24K 50K 250K 500K 1M

  8. Adjustment to Hillshading • Sky Illumination Model hillshade (Kennelly&Stewart, 2006) • Combine multiple hillshades with different azimuths X  X   X X  Sky Illumination Hillshade Default Hillshade

  9. Contours : Creation Contours 100 - 250 Contours 24 - 100 LG DEM Focal Statistics MED DEM Focal Statistics 10m DEM SM DEM Aggregate Focal Statistics Contours 250 - 750 XS DEM Aggregate Contours 750 - 1M Focal Statistics

  10. Contours : Analyzing contours • Looked at each subbasin to determine: • Contour density • Contour complexity

  11. Contours : 250K, 25m intervals Derived from md scale DEM Derived from sm scale DEM  X X 

  12. Contours : Recommendations CO WV ATL MO STL TX FL/GA UT

  13. Putting it all together : ScaleMaster To>

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