SSD powerpoint “presentation/screening” slide deck
Transcript of SSD powerpoint “presentation/screening” slide deck
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Monitoring the vegetation success of a rehabilitated mine site using multispectral UAV imagery
Tim Whiteside & Renée Bartolo, eriss
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• Working to protect the environment through environmental research and monitoring, environmental supervision, audit and inspection.
• Ensuring the protection of the Alligator Rivers Region from the effects of uranium mining and encouraging best practice in wetland conservation and management.
About the Supervising Scientist Main roles
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• Scheduled to cease operations in 2021
• Rehabilitated by 2026 • Needs a
comprehensive monitoring program to ensure integrity of rehabilitation
Ranger Uranium Mine
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• Plot based ecological methods
• Limited do to accessibility and resources
• Does not fully represent the biodiversity and spatial heterogeniety within these landscapes
Monitoring of rehabilitation
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• Can capture the biodiversity and spatial heterogeniety within these landscapes
• Provides total coverage of rehabilitated areas
• Can extract environmental variables relevant to monitoring
‒eg plant health, fractional cover
Remote sensing
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• Area under study is small • Hi-resolution satellite data is
expensive and not available on regular intervals (cloud, smoke haze)
• Manned aerial photography is ideal but expensive to deploy
• UAS is potentially a cost effective monitoring tool
Why go UAV?
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To develop and establish the use of UAVs for the monitoring of mine site rehabilitation
o in particular revegetation and erosion
Aim of this project
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UAS platform
• Swampfox X5 ‒ Skycam UAV
: www.kahunet.co.nz
‒ 2.3 m wingspan ‒ Electric motor ‒ Hawk AP and GCS
(DTA NZ)
• Rugged and easily patched
• Bungee launch • Parachute recovery
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Sensor payload • 2 modified Sony NEX5
16MP digital cameras ‒ 1 RGB ‒ 1 full spectrum
: Hoya R72 High Pass 720 nm NIR filter
‒ 1.5 frames per second
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Study site • Jabiluka mine site
– Rehabilitated in October 2013
– Provides an ideal study site for testing and development
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• Guided flights ‒ Mowing the lawn
• Sufficient overlap ‒ +50% side
‒ +80% forward
• Dates: – 28 April 2014
– 13 June 2104
– 23 September 2014
– 23 December 2014
– 23 April 2015
Data acquisition
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• GCPs marked and recorded with DGPS
• Black and white reference panels for radiometric correction
Geometric and radiometric correction
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• Processes ‒ Photo correction – vignetting, pixel differences ‒ Photo alignment – camera parameters, UAV
location and attitude ‒ Automated tie point extraction ‒ Dense point cloud reconstruction ‒ Meshing ‒ Surface model and orthomosaic creation
Data processing
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Photo orientation
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‒ Dense point cloud ‒ RGB orthomosaic ‒ NIR orthomosaic – GSD 4 cm ‒ DSM – GSD12 cm
Outputs
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Point cloud
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Jabiluka mine site
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April 2014
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June 2014
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September 2014
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December 2014
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Sample area
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April 2014
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June 2014
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September 2014
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December 2014
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Plants alive in April 2014
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Plants still alive in June 2014
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Plants still alive in June 2014 + dead plants
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Plants still alive in June 2014 - volunteers
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Plants still alive in September 2014
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Plants still alive in September 2014 + dead plants
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Plants still alive in September 2014 - volunteers
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The four Grevilleas
April 2014
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The four Grevilleas
June 2014
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The four Grevilleas
September 2014
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The four Grevilleas
December 2014
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Conclusion
• UAV data fills a niche between field work and satellite data
• Sparse trees aren’t good for automatic tie points – increased overlap may help
• The best times of day for flying do not align with time preferred for image capture
So far:
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Future work • Using the multi-temporal UAV data to
describe:
‒ the seasonality of plant growth phases; ‒ further analysis of structural, spectral
and textural information to discriminate tree and ground cover;
‒erosion detection ‒ trialling other sensors.
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• The proportion of various ground covers ‒ typically bare
ground, non-PS vegetation, and PS or green vegetation
• Proportions can be an indicator of condition
Fractional cover
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Image analysis Classification – step wise ‘tree’ model
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• Steps:
‒Develop photogrammetric workflow ‒Automated approach to image
analysis ‒Change detection
Becoming operational