PROPRIETARY INFORMATION, EARTHDATA INTERNATIONAL UNAUTHORIZED DUPLICATION OR USE NOT PERMITTED...
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Transcript of PROPRIETARY INFORMATION, EARTHDATA INTERNATIONAL UNAUTHORIZED DUPLICATION OR USE NOT PERMITTED...
PROPRIETARY INFORMATION, EARTHDATA INTERNATIONAL UNAUTHORIZED DUPLICATION OR USE NOT PERMITTED WITHOUT PRIOR WRITTEN CONSENT
NC 2004 Lidar Workshop
Presentation:Generating Contours From
Lidar Data
Prepared by: Tonda Shelton & Bob Ryan
EarthData International
Methods for Generating Contours
• Bare earth points only
• Bare earth “filtered” points
• Filtered points with “draped” breaklines
• Filtered points with stereo compiled 3D breaklines
Bare Earth Only
ContoursGenerated
FromBare Earth
Only
Filtered Bare Earth• Proprietary Program: “LidTinFilter”
• Input: bare earth points
• Define contour interval
• Performs a distance and slope analysis to determine point thinning required
• Output: filtered points
ContoursGenerated
FromFiltered Pts
Only
Bare Earth Points
Filtered Points
ContoursGenerated
FromFiltered Pts
and “Draped”Breaklines
Contoursgenerated
from:Filtered Pts
and Compiled
3D Breaklines