Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed.

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Andy Stauffer - CEGIS June 2011 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)

Andy Stauffer - CEGIS June M 10-L L Grand Canyon Rugged Terrain

Close up Example of Decisions 24K50K250K 500K1M

Detail 1M correct 1M using 24K processing X X

Close up Example of Decisions 24K50K250K 500K1M

Close up Example of Decisions 24K50K250K 500K 1M

Close up Example of Decisions 24K50K250K 500K1M

Andy Stauffer - CEGIS June 2011 Adjustment to Hillshading Sky Illumination Model hillshade (Kennelly&Stewart, 2006) – Combine multiple hillshades with different azimuths Default Hillshade Sky Illumination Hillshade X X X X

Contours : Creation 10m DEM Focal Statistics Contours MED DEM Focal Statistics LG DEM Contours Aggregate Focal Statistics SM DEM Contours Aggregate Focal Statistics XS DEM Contours M

Andy Stauffer - CEGIS June 2011 Contours : Analyzing contours Looked at each subbasin to determine: – Contour density – Contour complexity

Andy Stauffer - CEGIS June 2011 Contours : 250K, 25m intervals Derived from md scale DEMDerived from sm scale DEM X X

Andy Stauffer - CEGIS June 2011 Contours : Recommendations Scale Contour Smoothing Mountainous Contour Interval Hilly Contour Interval Flat Contour Interval 24KLG DEM25m10m5m 50KLG DEM KMED DEM KSM DEM KSM DEM KXS DEM MXS DEM CO WV ATL MO STL TX FL/GA UT

Andy Stauffer - CEGIS June 2011 Putting it all together : ScaleMaster To>