extracting canopies from lidar data and rgbi
DESCRIPTION
Presented by Jairo Castillo, City of Calgary See more FME World Tour 2014 presentations at www.safe.com/recap2014TRANSCRIPT
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CONNECT. TRANSFORM. AUTOMATE.
Canopy Extraction Using LiDAR and RGBi
Jairo CastilloData Analyst (The City of Calgary)
Camal DharamdialLead, Business Development & Innovation (The City of Calgary)
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Canopy Cover - Why
• The Municipal Development Plan (MDP) and Calgary Transportation Plan (CTP) approved by Council has Canopy Coverage as one of the Fourteen indicators of Watershed Health.
• Council expectation is to increase metric percent of tree canopy to 14-20% in 60 years
• The best report we have is from UFORE metrics – 1998 – 7.2% of Canopy.
• We need to validate this and set a baseline in 2014.
2COPYRIGHT © 2014 The City of Calgary
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ProcessWhy use LiDAR and Imagery?• LiDAR maps through canopy• LiDAR is independent of sun angle • LiDAR can be collected, day or night• Our process will use is RGBi combined with LiDAR
3COPYRIGHT © 2014 The City of Calgary
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LiDAR Principles
4COPYRIGHT © 2014 The City of Calgary
• Range = (travel time * speed of light) / 2.0• Range + pointing direction + GNSS + IMU XYZ
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LiDAR Principles
5COPYRIGHT © 2014 The City of Calgary
Outgoing laser pulse One or more return pulses Intensity of each return pulse
Outgoing laser pulse
First return
Second return
Third return
Fourth return
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Bookmarks
• Point Cloud• First and Last Returns• RGBi• Point Cloud x RGBi• Shp polygons and Cleanup
6COPYRIGHT © 2014 The City of Calgary
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Point Cloud
7COPYRIGHT © 2014 The City of Calgary
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Point Cloud
8COPYRIGHT © 2014 The City of Calgary
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First & Last Returns
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First Return Last Return
COPYRIGHT © 2014 The City of Calgary
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Last & Min Returns
10COPYRIGHT © 2014 The City of Calgary
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RGBi
• Decompose RGBi• NDVI=(nir-red)/(nir+red)
11COPYRIGHT © 2014 The City of Calgary
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RGBi
• NDVI x 20
12COPYRIGHT © 2014 The City of Calgary
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Point Cloud x RGBi
• NDVI x 20 x (last-min)
13COPYRIGHT © 2014 The City of Calgary
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Point Cloud x RGBi
• NDVI x 20 x (last-min)
14COPYRIGHT © 2014 The City of Calgary
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Shp and cleanup
15COPYRIGHT © 2014 The City of Calgary
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Shp and cleanup
16COPYRIGHT © 2014 The City of Calgary
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Canopies
17COPYRIGHT © 2014 The City of Calgary
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Workbench
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Thank You!
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• Questions?
• For more information:• Jairo [email protected] or • Camal [email protected]• The City of Calgary