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Spatial Analysis Application to Urban Forestry

This presentation shows development of land cover and elevation data and their uses in i-Tree Hydro to model effects of tree cover on water flow and water quality. Preliminary results for the Difficult Run watershed are shown.

Gregory Bacon

on 6 February 2014

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Transcript of Spatial Analysis Application to Urban Forestry

Spatial Analysis Application to Urban Forestry
data sources and processing in i-Tree Hydro
by Greg Bacon - Fairfax County GIS & Mapping
Prepared for Virginia Association of Forest Health Professionals
February 2014

Land Cover
The county is 54% forested? That's great!

We're 23 years early
in meeting our
goal of 45%.

What's going on?
True Class
Raster Class
7 Cover Classes
x 50 points per class

350 points
DEM elevations accurate to within
1.5 ft of surveyed check points
Stereoscopically Derived Mass Points and Breaklines
Digital Elevation Model
Worldview-2 Land Cover Classification
95% of the time
95% Confidence Interval = 53% ± 4%
Worldview-2 Multispectral Imagery
Captured Summer 2011
Highest resolution commercial satellite imagery available (1.8 m)
8 channels
Thank You!
Mike Knapp
Frank Finch
Joan Allen
Nick Drunasky
Classification Accuracy
Weather Data
Stream Gauge Data
Land Cover %
Soil Characteristics
Alternative Scenarios
Next Steps
Run model on sub watersheds

Engage other departments in assessing applicability to stormwater permitting

Input land cover raster in future release (?)
Stream Gauge
Full transcript