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terrain generalization : recommendations

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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)

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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. - PowerPoint PPT Presentation

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Page 1: Terrain Generalization : Recommendations

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)

Page 2: Terrain Generalization : Recommendations

Andy Stauffer - CEGIS June 2011

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

Grand CanyonRugged Terrain

Page 3: Terrain Generalization : Recommendations

Close up Example of Decisions24K 50K 250K

500K 1M

Page 4: Terrain Generalization : Recommendations

Detail

1M correct 1M using 24K processing

X

X

Page 5: Terrain Generalization : Recommendations

Close up Example of Decisions24K 50K 250K

500K 1M

Page 6: Terrain Generalization : Recommendations

Close up Example of Decisions24K 50K 250K

500K 1M

Page 7: Terrain Generalization : Recommendations

Close up Example of Decisions24K 50K 250K

500K 1M

Page 8: Terrain Generalization : Recommendations

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

XX

Page 9: Terrain Generalization : Recommendations

Contours : Creation

10m DEM

Focal Statistics

Contours24 - 100

MED DEM

Focal Statistics

LG DEM

Contours100 - 250

Aggregate Focal Statistics

SM DEM

Contours250 - 750

Aggregate Focal Statistics

XS DEM

Contours750 - 1M

Page 10: Terrain Generalization : Recommendations

Andy Stauffer - CEGIS June 2011

Contours : Analyzing contours

• Looked at each subbasin to determine:– Contour density– Contour complexity

Page 11: Terrain Generalization : Recommendations

Andy Stauffer - CEGIS June 2011

Contours : 250K, 25m intervalsDerived from md scale DEM Derived from sm scale DEM

X

X

Page 12: Terrain Generalization : Recommendations

Andy Stauffer - CEGIS June 2011

Contours : Recommendations

Scale Contour Smoothing

Mountainous Contour Interval

HillyContour Interval

FlatContour Interval

24K LG DEM 25m 10m 5m

50K LG DEM 25 10 5

100K MED DEM 25 25 5

250K SM DEM 100 25 25

500K SM DEM 100 50 50

750K XS DEM 250 100 50

1M XS DEM 250 100 100

COWV

ATL

MOSTLTX

FL/GAUT

Page 13: Terrain Generalization : Recommendations

Andy Stauffer - CEGIS June 2011

Putting it all together : ScaleMaster

To>


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