How Well Does a Virtual Tree Survey Work?
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This document summarizes a study comparing tree surveys conducted virtually using Google Street View imagery to traditional field surveys. The virtual survey identified 606 trees across 10 miles of streets, matching 93% of the 597 trees found in the field survey. Genus identification agreed for 90% of trees while species identification agreed for 66% of large, common trees. The virtual survey resulted in tree counts and sizes that were around 10% lower than the field survey. While not a replacement for field surveys, the study finds virtual surveys can provide a free and easy method for coarse tree inventory data collection and updating existing inventories.
How Well Does a Virtual Tree Survey Work?
- 1. How well does a virtual street tree survey work? Dr. Adam Berland Ball State University
- 2. http://vision.caltech.edu/registree/ L.A. wants Caltech and Google to count the city's trees -LATimes July 27, 2016
- 3. Can we generate quality data using a virtual survey in GSV? © 2016 Google
- 4. Cincinnati suburbs Mt. Healthy Reading Wyoming Field data (2013) All trees on >10% sample of local streets Virtual survey analyst: Bachelor’s in field botany
- 6. RESULTS 10 miles of street length Field survey 597 trees Virtual survey 606 trees 93% ‘matched’ Time mismatch for field/virtual
- 7. Genus agreement: 90% Species agreement: 66% Large, common, distinctive © 2016 Google
- 8. Berland & Lange (in review) 1-to-1 line Regression line Slope = 0.79 R2 = 0.80
- 9. Imagery © 2016 Google
- 10. 0 100,000 200,000 300,000AnnualBenefits($) Virtual Field i-Tree Streets: Virtual survey ~10% lower than field survey
- 11. Performance recap Tree count / location Tree ID Size (DBH) © 2016 Google
- 12. © 2016 Google
- 13. Recommendations Does not replace field surveys Free & easy approach Coarse variables Update existing inventories
- 14. Questions / comments / ideas Adam Berland amberland@bsu.edu