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CONNECT. TRANSFORM. AUTOMATE.
Canopy Extraction Using LiDAR
and RGBi
Jairo Castillo
Data Analyst (The City of Calgary)
Cam...
Canopy Cover - Why
• The Municipal Development Plan (MDP) and Calgary Transportation
Plan (CTP) approved by Council has Ca...
Process
Why use LiDAR and Imagery?
• LiDAR maps through canopy
• LiDAR is independent of sun angle
• LiDAR can be collecte...
LiDAR Principles
4
COPYRIGHT© 2014 The City of Calgary
• Range = (travel time * speed of light) / 2.0
• Range + pointing d...
LiDAR Principles
5
COPYRIGHT© 2014 The City of Calgary
 Outgoing laser pulse
 One or more return pulses
 Intensity of e...
Bookmarks
• Point Cloud
• First and Last Returns
• RGBi
• Point Cloud x RGBi
• Shp polygons and Cleanup
6
COPYRIGHT© 2014 ...
Point Cloud
7
COPYRIGHT© 2014 The City of Calgary
Point Cloud
8
COPYRIGHT© 2014 The City of Calgary
First & Last Returns
9
First Return Last Return
COPYRIGHT© 2014 The City of Calgary
Last & Min Returns
10
COPYRIGHT© 2014 The City of Calgary
RGBi
• Decompose RGBi
• NDVI=(nir-red)/(nir+red)
11
COPYRIGHT© 2014 The City of Calgary
RGBi
• NDVI x 20
12
COPYRIGHT© 2014 The City of Calgary
Point Cloud x RGBi
• NDVI x 20 x(last-min)
13
COPYRIGHT© 2014 The City of Calgary
Point Cloud x RGBi
• NDVI x 20 x(last-min)
14
COPYRIGHT© 2014 The City of Calgary
Shp and cleanup
15
COPYRIGHT© 2014 The City of Calgary
Shp and cleanup
16
COPYRIGHT© 2014 The City of Calgary
Canopies
17
COPYRIGHT© 2014 The City of Calgary
Workbench
18
COPYRIGHT© 2014 The City of Calgary
Thank You!
19
• Questions?
• For more information:
• Jairo jairo.castillo@calgary.ca or
• Camal camal.dharamdial@calgary.c...
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Extracting Canopies from LiDAR Data and RGBI

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Presented by Jairo Castillo, City of Calgary
See more FME World Tour 2014 presentations at www.safe.com/recap2014

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Extracting Canopies from LiDAR Data and RGBI

  1. 1. CONNECT. TRANSFORM. AUTOMATE. Canopy Extraction Using LiDAR and RGBi Jairo Castillo Data Analyst (The City of Calgary) Camal Dharamdial Lead, Business Development & Innovation (The City of Calgary)
  2. 2. 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. 2 COPYRIGHT© 2014 The City of Calgary
  3. 3. Process Why 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 3 COPYRIGHT© 2014 The City of Calgary
  4. 4. LiDAR Principles 4 COPYRIGHT© 2014 The City of Calgary • Range = (travel time * speed of light) / 2.0 • Range + pointing direction + GNSS + IMU XYZ
  5. 5. LiDAR Principles 5 COPYRIGHT© 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
  6. 6. Bookmarks • Point Cloud • First and Last Returns • RGBi • Point Cloud x RGBi • Shp polygons and Cleanup 6 COPYRIGHT© 2014 The City of Calgary
  7. 7. Point Cloud 7 COPYRIGHT© 2014 The City of Calgary
  8. 8. Point Cloud 8 COPYRIGHT© 2014 The City of Calgary
  9. 9. First & Last Returns 9 First Return Last Return COPYRIGHT© 2014 The City of Calgary
  10. 10. Last & Min Returns 10 COPYRIGHT© 2014 The City of Calgary
  11. 11. RGBi • Decompose RGBi • NDVI=(nir-red)/(nir+red) 11 COPYRIGHT© 2014 The City of Calgary
  12. 12. RGBi • NDVI x 20 12 COPYRIGHT© 2014 The City of Calgary
  13. 13. Point Cloud x RGBi • NDVI x 20 x(last-min) 13 COPYRIGHT© 2014 The City of Calgary
  14. 14. Point Cloud x RGBi • NDVI x 20 x(last-min) 14 COPYRIGHT© 2014 The City of Calgary
  15. 15. Shp and cleanup 15 COPYRIGHT© 2014 The City of Calgary
  16. 16. Shp and cleanup 16 COPYRIGHT© 2014 The City of Calgary
  17. 17. Canopies 17 COPYRIGHT© 2014 The City of Calgary
  18. 18. Workbench 18 COPYRIGHT© 2014 The City of Calgary
  19. 19. Thank You! 19 • Questions? • For more information: • Jairo jairo.castillo@calgary.ca or • Camal camal.dharamdial@calgary.ca • The City of Calgary

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