Publication Details

Near-surface remote sensing of spatial and temporal variation in canopy phenology

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Richardson, Andrew D.; Braswell, Bobby H.; Hollinger, David Y.; Jenkins, Julian P.; Ollinger, Scott V.

Year Published

2009

Publication

Ecological Applications: 19(6): 1417-1428.

Abstract

There is a need to document how plant phenology is responding to global change factors, particularly warming trends. "Near-surface" remote sensing, using radiometric instruments or imaging sensors, has great potential to improve phenological monitoring because automated observations can be made at high temporal frequency. Here we build on previous work and show how inexpensive, networked digital cameras ("webcams") can be used to document spatial and temporal variation in the spring and autumn phenology of forest canopies. We use two years of imagery from a deciduous, northern hardwood site, and one year of imagery from a coniferous, boreal transition site. A quantitative signal is obtained by splitting images into separate red, green, and blue color channels and calculating the relative brightness of each channel for "regions of interest" within each image.

Citation

Richardson, Andrew D.; Braswell, Bobby H.; Hollinger, David Y.; Jenkins, Julian P.; Ollinger, Scott V. 2009. Near-surface remote sensing of spatial and temporal variation in canopy phenology. Ecological Applications: 19(6): 1417-1428.

Last updated on: September 25, 2009