ozri2015_mark wisniewski
TRANSCRIPT
Protecting nationally threatened coastal ecosystems through supporting
volunteers
This project is supported by Cradle Coast NRM, through funding from the Australian Government’s National Landcare Programme
What is Natural Resource Management?
Project aims
Identify threats & prioritise activities
Support local volunteer groups
Provide spatial analysis and support
Environmental outcomes
Who are the Circular Head Landcare Group?
• Passionate group of 15 volunteers interested in local environmental issues
• Projects include – maintenance of coastal vegetation– weed control and tree planting at various sites – beach profile monitoring and shorebird counts
Nationally threatened coastal ecosystems
• Known as Subtropical and Temperate Coastal Saltmarsh (hereafter Saltmarsh)
• Listed as Vulnerable under the Environment Protection and Biodiversity Conservation Act 1999
• 1,200 Ha or 20% of Tasmania
• One of the threats to saltmarsh is rice grass invasion
Source: Circular Head Region Coastal Foreshore Habitats: Sea Level Rise Vulnerability Assessment
Saltmarsh - threatening processes
• Rice grass (common cord grass) replaces saltmarsh
• Changes vegetation structure
• Reduced habitat for birds
Source: Commonwealth Conservation Advice for Subtropical and Temperate Coastal Saltmarsh
Project Management Issues
• Timing of spraying
• Control costs are high
• Spatial extent of rice grass is unknown
• Density is variable or unknown
Methods
• Current state of knowledge of rice grass distribution
• Reconnaissance of rice grass distribution
• Supervised classification
• Updated results
Current distribution
Aerial Reconnaissance
Stage 1 of project with Cradle Coast NRM from January to June 2015.
Digitising
Combine datasets
Validate results
Geoprocessing steps
Image classification
Select training samples
Extract world imagery
Spatial distributionof rice grass
Rice grass discovery
• Rice grass identified in Esri World Basemap Imagery
• Utilise the World Imagery (for Export) service to create Mosaic Dataset.
Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Issues selecting training samples
Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Image Classification
Spectral signatures obtained from training samples to classify an image.
1. Select training samples (rice grass, mud flats and water)
2. Run “Interactively Supervised Classification”
3. Evaluate the results and export when happy
Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Validate Results
Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Provide access to archive raw imagery for analysis, January 10th 2014 selected
Commission WorldView-3 to capture data this summer over Duck Bay.
DigitalGlobe support
Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Image Comparison
April 2011 January 2014
Imagery provided courtesy of DigitalGlobe, Inc. © 2015Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Supervised classification results
April 2011 January 2014
Imagery provided courtesy of DigitalGlobe, Inc. © 2015Imagery provided courtesy of DigitalGlobe, Inc. © 2015
Updated Results
Combine 2011 and 2014 classification datasets
Information shared with Circular Head Landcare Group and community
Conclusion and the future
• Estimated primary rice grass control to cost $57,200 for Duck Bay
• Many analysis challenges encountered
• GIS is core business via the ArcGIS platform for NRM
• This summer will be exciting updating current datasets
End
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