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Landscapes and

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This shows us information that we could not see in the air photo. Air photo ... Digital Elevation Model of Downtown Cleveland. WHY USE DIGITAL ELEVATION MODELS? ... – PowerPoint PPT presentation

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Title: Landscapes and


1
Landscapes and
2
100km
Detroit
Toledo
Cleveland
Pittsburgh
Columbus
Cincinnati
3
ESR
Laboratory
Kent State University
Ohio DEM 30m Digital Elevation Model of Ohio.
Compiled and clipped from the National Elevation
Dataset
100km
4
Observing the Earth from above provides a wealth
of information
  • 1860 first successful photograph that is still
    preserved was taken over Boston, Massachusetts by
    James Black and Samuel King.
  • Obtained from a hot air balloon at 1200ft

5
Air photo from Northern Alberta, Canada
6
Digital Elevation Model (DEM) from the same
region of Northern Alberta
Air photo
  • This shows us information that we could not see
    in the air photo

7
3-D Visualization of Landscapes
Digital Elevation Model of Downtown Cleveland
8
WHY USE DIGITAL ELEVATION MODELS?
  • DEMs display virtually no features that were made
    by humans

9
What is a DEM (Digital Elevation Model)?
Files of elevation data with each pixel assigned
a height value
10
What the numbers mean when converted to a DEM
4
3
2
1
0
11
Some satellites can measure heights on the ground
or even the sea
  • Skylab
  • Geos-3
  • SeaSat
  • GeoSat
  • ERS-1
  • Topex/Poseidon
  • ERS-2

TOPEX
12
What are DEMs used for?
  • Monitoring glacial movement, growth, and decay
  • Simulating river flow
  • Determining how much of a landscape would be
    flooded if a dam was built
  • Monitor Earth movements

13
Damming What if the Grand Canyon was dammed
14
700m
650m
800m
750m
1600m
900m
15
Landsat 7 image of Cleveland and NASA Glenn
16
DEM model of Cleveland and NASA Glenn
17
Light occurs in different wavelengths
SHORTEST
LONGEST
18
ADVANCE
RETREAT
19
Courtesy of Chromadepth
20
Courtesy of Chromadepth
21
The Tibetan Plateau
Chromostereoscopy
22
(No Transcript)
23
NASA Glenn
24
Monitoring Change the eruption of Mount St.
Helens, May 18th, 1980
25
1980 eruption of Mount St. Helens
Before the eruption
After the eruption
26
Watershed studies
The Cuyahoga
27
http//www.uwm.edu/People/ehlinger/physical.htm
28
The Cuyahoga Watershed Sub-basins
N. Stump
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