Model CI-110 - Plant Canopy Imager


The CI-110’s digital platform enables you to simultaneously capture wide-angle plant canopy images and estimate Leaf Area Index (LAI) and Photosynthetically Active Radiation (PAR) levels from a single canopy scan. No more taking multiple scans above and below the canopy…leave your tree-climbing equipment at home.

One measurement provides a full complement of data, unlike systems which require the user take multiple measurements and attach various masking devices to obtain meaningful data.

' Short of actually collecting leaves, which eliminates the opportunity to measure canopy change over time, hemispherical photography is the method of choice for measuring LAI.' (Jonckheere et al. 2004)

  • Instant Data: Captures Canopy image and calculates Leaf Area Index (LAI) and Photosynthetic Active Radiation (PAR) levels
  • Onsite Evaluation: The CI-110 digital process needs only one scan beneath the canopy, allowing on-site evaluation under any daylight conditions
  • User-Defined: User-selected number of zenith divisions (rings) and azimuthal divisions allows investigation of any canopy sectors desired
  • Lightweight: 0.5 Kg instrument is handheld and simple to use

Lightweight (500 grams) and fast, the CI-110 revolutionizes data collection for forest management, crop science and environmental research!

The CI-110 Digital Plant Canopy Imager consists of an auto-leveling image capturing probe and arm with 24 PAR sensors, built-in USB interface for an optional laptop or palmtop computer, and software. To calculate PAR and LAI, the CI-110 captures a 170° fisheye image of the canopy, which can be divided into any number of zenith and azimuthal divisions desired. In this way, you may focus on all or any part of the canopy for study. The software digitizes and manipulates the captured images, then calculates the solar beam transmission coefficients, or the fraction of the sky visible from beneath the plant canopy. A value between 0 and 1 is assigned; with 0 meaning no sky is visible below the plant canopy, and 1 meaning that the entire area is sky or no foliage coverage. A fraction indicates partial foliage cover.

Figure: Grids for analyzing fish-eye images.

The gap-fraction inversion procedure is used to calculate Leaf Area Index of the canopy, diffuse radiation transmission coefficients, mean foliage inclination angles, and plant canopy extinction coefficients. The output data is then displayed on the computer screen and can be saved in a file. The CI-110 software first divides the image into sectors according to user-defined number of zenith division (rings) and azimuthal division. Then, the fraction of sky (solar beam transmission coefficient) visible in each sector is automatically analyzed by tallying the sky portion of the image pixels in that sector. After all the sectors have been analyzed and the average solar beam transmission coefficients for each zenith division are computed, the hemispherical diffuse radiation transmission coefficient (the sky view factor), mean foliage inclination angles, and plant canopy extinction coefficients are computed by CI-110's plant canopy analysis software.

*Norman J.M. and Campbell, G.S. (1989) Canopy Structure. In: Plant Physiological Ecology, Field methods and instrumentation. (eds. R. W. Pearcy, . Ehleringer, H.A. Moorney and P.W. Rundel), Chapman & Hall, London and New York, pp. 301-325.

  • Single measurement for data collection
  • 170°-wide viewing angle with live high-resolution fish-eye image
  • Collect data under any lighting conditions. The CI-110 accommodates for changes in ambient light
  • Non-destructive measurement of Leaf Area Index (LAI) and Photosynthetically Active Radiation (PAR)
  • On-site evaluation of solar beam transmission coefficients or gap fractions
  • Calculation of diffuse radiation transmission coefficients (the sky view factor), mean foliage inclination angles, and plant canopy extinction coefficients
  • User-selected number of zenith and azimuthal divisions allows investigation of any canopy sectors desired
  • Sun-path can be easily plotted on the image
  • A fully integrated ceptometer with 24 photodiodes to measure Sunflecks in the range of Photosynthetically Active Radiation

  • Lens: Self Leveling Hemispherical Lens
  • Image Resolution: 180,956 pixels
  • Interface: USB
  • Measuring Time: 0.5-1 second
  • Fish-eye Lens Angle: 150°
  • Operating Temperature: 5 to 50° C
  • Probe Size: 42 × 72 mm
  • Arm Length: 440 mm
  • Probe and Arm Weight: 0.45 kg
  • PAR: 24 PAR sensors, 10 mm spacing

Simply position the CI-110 under the desired leaf canopy. The auto-leveling fisheye camera lens (170°) displays a live image of the canopy for accurate data collection. Once you have captured the desired canopy image, software-driven analysis manipulates any data portion you desire, making manual image masking obsolete.

Calculations Performed:

  • Leaf Area Index (LAI)
  • Mean Foliage Inclination
  • Sunflecks - The fraction of visible sky from below the canopy
  • Photosynthetically Active Radiation (PAR)

The CI-110 Digital Plant Canopy Imager includes:

  • Self leveling digital fish-eye imaging probe
  • Driver software
  • Operational software
  • 24 PAR sensor-arm with USB interface
  • Operations manual
  • Hard-shell instrument carrying case
  • Optional handheld computer

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