Title: Landscapes and
1Landscapes and
2100km
Detroit
Toledo
Cleveland
Pittsburgh
Columbus
Cincinnati
3ESR
Laboratory
Kent State University
Ohio DEM 30m Digital Elevation Model of Ohio.
Compiled and clipped from the National Elevation
Dataset
100km
4Observing 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
5Air photo from Northern Alberta, Canada
6Digital 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
73-D Visualization of Landscapes
Digital Elevation Model of Downtown Cleveland
8WHY USE DIGITAL ELEVATION MODELS?
- DEMs display virtually no features that were made
by humans
9What is a DEM (Digital Elevation Model)?
Files of elevation data with each pixel assigned
a height value
10What the numbers mean when converted to a DEM
4
3
2
1
0
11Some satellites can measure heights on the ground
or even the sea
- Skylab
- Geos-3
- SeaSat
- GeoSat
- ERS-1
- Topex/Poseidon
- ERS-2
TOPEX
12What 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
13Damming What if the Grand Canyon was dammed
14700m
650m
800m
750m
1600m
900m
15Landsat 7 image of Cleveland and NASA Glenn
16DEM model of Cleveland and NASA Glenn
17Light occurs in different wavelengths
SHORTEST
LONGEST
18ADVANCE
RETREAT
19Courtesy of Chromadepth
20Courtesy of Chromadepth
21The Tibetan Plateau
Chromostereoscopy
22(No Transcript)
23NASA Glenn
24Monitoring Change the eruption of Mount St.
Helens, May 18th, 1980
251980 eruption of Mount St. Helens
Before the eruption
After the eruption
26Watershed studies
The Cuyahoga
27http//www.uwm.edu/People/ehlinger/physical.htm
28The Cuyahoga Watershed Sub-basins
N. Stump