andy stauffer - cegis june 2011 terrain generalization : recommendations 3 breaks – 24k – 250k...
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![Page 1: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/1.jpg)
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: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/2.jpg)
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
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Close up Example of Decisions24K 50K 250K
500K 1M
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Detail
1M correct 1M using 24K processing
X
X
![Page 5: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/5.jpg)
Close up Example of Decisions24K 50K 250K
500K 1M
![Page 6: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/6.jpg)
Close up Example of Decisions24K 50K 250K
500K 1M
![Page 7: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/7.jpg)
Close up Example of Decisions24K 50K 250K
500K 1M
![Page 8: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/8.jpg)
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: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/9.jpg)
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: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/10.jpg)
Andy Stauffer - CEGIS June 2011
Contours : Analyzing contours
• Looked at each subbasin to determine:– Contour density– Contour complexity
![Page 11: Andy Stauffer - CEGIS June 2011 Terrain Generalization : Recommendations 3 breaks – 24K – 250K – 250K – 750K – 750K – 1M Processing Steps – 10m DEM, smoothed](https://reader030.vdocuments.site/reader030/viewer/2022032723/56649d1c5503460f949f19f6/html5/thumbnails/11.jpg)
Andy Stauffer - CEGIS June 2011
Contours : 250K, 25m intervals
Derived from md scale DEM Derived from sm scale DEM
X
X
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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
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Andy Stauffer - CEGIS June 2011
Putting it all together : ScaleMaster
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