Can You Trust Google Earth?
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Transcript of Can You Trust Google Earth?
Can You Trust Google Earth?
Math and Computer Science Department Seminar
Wheaton College
Problem:
Get directions to Osseo Circle, Lincoln, NH
MapQuest
MapQuest
MapQuest
Whoops!
Database problem
Google Maps
Same problem!
Google Earth
Dear Ol' Wheaton
Google Earth
Something's amiss!
Google Maps
Huh?
Google Earth - Terrain
Terrain Storage: DEM
DEM = Digital Elevation Model
Regular grid of elevation points
Creating a DEM
Traditional
Spot Heights
Stereo Aerial Photography
AutomatedStereo Matching
Convert toDLG
Convert toDEM
Manual Contouring
Errors!
Creating a DEM
Traditional
Spot Heights
State of the Art
Stereo Aerial Photography
AutomatedStereo Matching
Convert toDLG
Convert toDEM
Manual Contouring
Satellite
SAR
Plane
LiDAR
InternalRepresentation
Convert toDEM
Errors!
DEM Error Viewer
Error Visualization
Error Visualization