urban tree canopy change assessment for southern oahu
TRANSCRIPT
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Urban Tree Canopy Change Assessment for Southern Oahu
Wai Lee*, Sean MacFaden, Jarlath O’Neil-Dunne, and Teresa Trueman-Madriaga*
University of Vermont, Smart Trees Pacific*
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Tree Canopy (TC) Assessments
USDA Forest Service/University of Vermont
Summarize Existing and Potential TC
>70 Assessments, U.S. and Canada
Increasingly larger areas (e.g., metro areas, counties, states)
Pictometry International Corp
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How much tree canopy do we have?
How much room is there to plant trees?
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Change Detection
Municipal Investments in Tree Canopy
What Are Tree-canopy Trends?
Second-generation LiDAR Collections
Updated UTC Assessments
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Oahu Urban Tree Canopy Assessment - 2010
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Methods
Multispectral Imagery and LiDAR
Thematic Data
Object-based Image Analysis
Map Canopy to Scale of Individual Trees
Map Other Primary Land-cover Features
Wildlife Habitat Modeling
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Worldview-2
2010
1.65-ft (0.50-m)
8 bands (Visible, Near Infrared, et al.)
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Worldview-2
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LiDARLight Detection And Ranging
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Courtesy of Dodson & Associates
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X = 477589.675Y = 786620.334
Z = 532
X = 47780.122Y = 786621.913
Z = 384
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Digital Surface Model (DSM)
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Digital Elevation Model (DEM)
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Normalized Digital Surface Model (nDSM)
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LiDAR Intensity
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LiDAR – 2010 UTC Assessment
2009
LiDAR Processed by USGS\NGA
3.281-ft (1-m) surface models
nDSM and Intensity
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Thematic Data
Building Footprints, Hydrology, Runways
Roadbed Delineations Ideal
Centerlines
Estimate Roadbeds
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Object-based Image Analysis
Objects Rather Than Pixels
Context and Texture
Data Fusion – raster, vector, LiDAR
eCognition – Enterprise Processing
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Tree CanopyGrass/ShrubBare EarthWaterBuildingsRoadsOther Paved Surfaces
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Automated Feature Extraction (eCognition)
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Segmentation
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Add Thematic Buildings and Water
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Resolve Building Edge Discrepancies
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Add Canopy Overhanging Buildings
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Cleanup and Morphology
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Remaining Classes: Grass Vs. Impervious
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Estimate Roads and Add to Classification
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Finalize Classes and More Cleanup
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Manual Corrections
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Fix Obvious Inconsistencies
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Final Product
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Grass/ShrubBare SoilOther Paved
Tree Canopy
Exis
tin
g
Poss
ible
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• 76,761 acres of land in urban zone (excludes water)
• 15,274 acres of Existing UTC
• 27,224 acres of Possible UTC that is grass/shrub
• 13,760 acres of Possible UTC that is impervious (includes AG, Bare Soil)
• 20,613 acres is not suitable for tree canopy (buildings, roads)
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Oahu Urban Tree Canopy Assessment - 2013
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LiDAR – 2013 UTC Assessment
2013
LiDAR Processed by UVM SAL
3.281-ft (1-m) surface models
Some gaps in mountainous areas
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LiDAR Coverage
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Change Detection
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Next Steps
Continue Rule-set Development
Manual Corrections
2013 Land-cover Map
Updated UTC Report
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Urban Tree Canopy Change Assessment for Southern Oahu
Funding Provided by USDA Forest Service
University of Vermont, Smart Trees Pacific
Pictometry International Corp
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Urban Tree Canopy Change Detection Assessment for Southern Oahu
http://letters-sal.blogspot.comhttp://nrs.fed.us./urban/utchttp://smarttreespacific.org
[email protected]@uvm.edu
[email protected]@hawaii.rr.com
University of Vermont, Smart Trees Pacific
Pictometry International Corp