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Basal Area from Photopoints…..
Is it possible?
Ben Sparrow

TERN Ausplots
1
Ways it is currently obtained
Basal Wedge

DBH Measurement

Terrestrial LiDAR

2
An Alternative:
A New Photopoint method
Photo Layout

•24mm Focal Length
•Aperture = F11
•ISO 100
•Raw Format (+/- JPG)
•1.3m to centre of lens
•Calibration target used
•2.5m Baseline
•DGPS Location recorded
Ausplots Rangelands –
Survey Protocols Manual

3
A New Photopoint method
The Tripod

Tripod and Star
Picket setup

If terrain not flat
then attempt to copy
the average slope.
4
A New Photopoint method
Raw outputs

ETC.
5
The Scene Reconstruction Process
Identifes Like features in images pairs
Uses this to calculate camera location
Using Camera location information projects information into 3d
space

6
DBH Calculations
Trunks then identified Spectrally, but including 3D
information
A Cylinder is fitted to each trunk
The Cylinder is cut at 1.3m (DBH) and the area of the
cross section is calculated (DBH for the individual tree)
These DBH’s are then summed for the whole site.
Currently hasa max depth of view, but improvements
being worked on.
Trunk Identification and Basal area
calculation

8
Other outputs: pointclouds

9
Other Outputs: Panoramas

10
Benefits

11
Benefits
Method

Cost
Equipment

Cost Staff

Time

Accuracy

Direct Harvesting

*

***

***

***

Basal Wedge

*

*

*

*

DBH measures

*

***

***

***

LIDAR

***

***

***

***

Photopoints

**

*

*

**
12
Future work
Take account of Occlusion
Trial and accuracy assess in a variety of ecosystems
Determine method variation needed for different environments
Automate processing (Work Commenced)
– Submission for the public using a web interface
Manage Huge Datasets
Process our archive of 300+ Sites
13
Contact us:
Ben Sparrow – Ben.sparrow@adelaide.edu.au
Thanks to Co-authors/ More Information:
Technical / Processing – Ben Ward and Anton van den
Hengel
Field Application – Nikki Thurgate, Stefan Caddy- Retalic and
Andrew Lowe.
Combination with Lidar – John Armston, Mick Schaefer,
Jasmine Muir and Stuart Phinn
Protocols Manual @ http://bit.ly/1ctfAx7

14
Link To Video

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EcoTas13 BenSparrow Photopoints

  • 1. Basal Area from Photopoints….. Is it possible? Ben Sparrow TERN Ausplots 1
  • 2. Ways it is currently obtained Basal Wedge DBH Measurement Terrestrial LiDAR 2
  • 3. An Alternative: A New Photopoint method Photo Layout •24mm Focal Length •Aperture = F11 •ISO 100 •Raw Format (+/- JPG) •1.3m to centre of lens •Calibration target used •2.5m Baseline •DGPS Location recorded Ausplots Rangelands – Survey Protocols Manual 3
  • 4. A New Photopoint method The Tripod Tripod and Star Picket setup If terrain not flat then attempt to copy the average slope. 4
  • 5. A New Photopoint method Raw outputs ETC. 5
  • 6. The Scene Reconstruction Process Identifes Like features in images pairs Uses this to calculate camera location Using Camera location information projects information into 3d space 6
  • 7. DBH Calculations Trunks then identified Spectrally, but including 3D information A Cylinder is fitted to each trunk The Cylinder is cut at 1.3m (DBH) and the area of the cross section is calculated (DBH for the individual tree) These DBH’s are then summed for the whole site. Currently hasa max depth of view, but improvements being worked on.
  • 8. Trunk Identification and Basal area calculation 8
  • 12. Benefits Method Cost Equipment Cost Staff Time Accuracy Direct Harvesting * *** *** *** Basal Wedge * * * * DBH measures * *** *** *** LIDAR *** *** *** *** Photopoints ** * * ** 12
  • 13. Future work Take account of Occlusion Trial and accuracy assess in a variety of ecosystems Determine method variation needed for different environments Automate processing (Work Commenced) – Submission for the public using a web interface Manage Huge Datasets Process our archive of 300+ Sites 13
  • 14. Contact us: Ben Sparrow – Ben.sparrow@adelaide.edu.au Thanks to Co-authors/ More Information: Technical / Processing – Ben Ward and Anton van den Hengel Field Application – Nikki Thurgate, Stefan Caddy- Retalic and Andrew Lowe. Combination with Lidar – John Armston, Mick Schaefer, Jasmine Muir and Stuart Phinn Protocols Manual @ http://bit.ly/1ctfAx7 14