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Harvard Forest Data Archive

HF158

PhenoCam Images and Canopy Phenology at Harvard Forest since 2008

Related Publications

Data

Overview

  • Lead: Andrew Richardson
  • Investigators: William Munger
  • Contact: Andrew Richardson
  • Start date: 2008
  • End date: 2013
  • Status: ongoing
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.53 to +42.55
  • Longitude: -72.20 to -72.17
  • Elevation: 280 to 420 meter
  • Taxa:
  • Release date: 2008
  • Revisions:
  • EML file: knb-lter-hfr.158.12
  • DOI: digital object identifier
  • Related links:
  • Study type: long-term measurement
  • Research topic: ecological informatics and modelling; forest-atmosphere exchange; ; regional studies
  • LTER core area: primary production, populations
  • Keywords: canopies, imagery, leaves, phenology, remote sensing
  • Abstract:

    A collaborative research network (“PhenoCam”) to provide automated "near" remote sensing of canopy phenology across the northeastern US and adjacent Canada has been initiated. A pilot study (2006-2007) at the Bartlett Experimental Forest previously demonstrated the viability of tracking both spring green-up and autumn senescence based on relative changes in red, green, and blue (RGB) color channel brightness values extracted from networked digital camera (“webcam”) images. In 2008, we installed commercial-grade digital webcams at a dozen established research sites across the northeast, from Ontario and New York across to Maine, with most sites concentrated within a few degrees of 45 deg N. Two additional Midwestern sites were subsequently added to the network.

    At seven camera sites (Bartlett, Howland, Harvard Forest, Groundhog River, Chibougamau, University of Michigan Biological Station, and Morgan Monroe State Forest), ongoing measurements of carbon and water fluxes are being made with the eddy covariance method, which will enable us to directly link phenology to seasonal variation in ecosystem processes. The seasonal trajectory of a “greenness index” for Harvard Forest shows a rapid rise in greenness in spring (coinciding with ground observations of budburst), a gentle decline over the course of the summer, and then a rapid decline with autumn senescence.

    This network is providing a very rich (and unique) dataset on spatial and temporal patterns of canopy phenology in the across this region. Half hourly images are uploaded to a project web page (http://phenocam.sr.unh.edu), which also features additional information about the project, including a protocol for camera deployment, download tools (so that the imagery is available to a wider community), site locations and contact information, etc. Image processing routines are under development. Time series of greenness will be added to the archive when this is complete; at present, only images are being made available.

  • Methods:

    Webcams are currently installed on four towers at the Harvard Forest: the EMS tower (HF004, since 2008), the HEM tower (HF103, since 2010), the LPH tower (HF072, since 2010), and the Barn tower (since 2011). The EMS tower and Barn tower also supports a sub-canopy webcam (since 2008 and 2011, respectively). Images are recorded at 30-minute intervals during daylight hours and uploaded to the project archive at the University of New Hampshire.

    This archive contains a single mid-day image for each site. For additional images please contact the principal investigator, Andrew Richardson, or see the PhenoCam Project website (http://phenocam.sr.unh.edu).

  • Use:

    This dataset is released to the public under Creative Commons license CC BY (Attribution). Please keep the designated contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement.

  • Citation:

    Richardson A. 2008. PhenoCam Images and Canopy Phenology at Harvard Forest since 2008. Harvard Forest Data Archive: HF158.

Detailed Metadata

HF158-01: EMS tower images

  • Compression: zip
  • Format: jpeg
  • Type: zip

HF158-02: EMS subcanopy images

  • Compression: zip
  • Format: jpeg
  • Type: zip

HF158-03: Hemlock tower images

  • Compression: zip
  • Format: jpeg
  • Type: zip

HF158-04: Little Prospect Hill tower images

  • Compression: zip
  • Format: jpeg
  • Type: zip

HF158-05: Barn tower 1 images

  • Compression: zip
  • Format: jpeg
  • Type: zip

HF158-06: Barn tower 2 images

  • Compression: zip
  • Format: jpeg
  • Type: zip

HF158-07: Barn tower Vivotek images

  • Compression: zip
  • Format: jpeg
  • Type: zip