1 / 11

The CAN_EYE software for processing Digital Hemispherical Photos

The CAN_EYE software for processing Digital Hemispherical Photos. F. Baret, M. Weiss. How to derive LAI from gap fraction. fCover= 1- Po (0) fAPAR( q s ) fIPAR( q s )= 1- Po ( q s ). The LAI Po relationship. Uncertainties in LAI estimates. 0.08. 0.04. 0.02. 0.01. -0.01. -0.02. -0.04.

brit
Download Presentation

The CAN_EYE software for processing Digital Hemispherical Photos

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The CAN_EYE software for processing Digital Hemispherical Photos F. Baret, M. Weiss CAN_EYE

  2. How to derive LAI from gap fraction • fCover= 1-Po(0) • fAPAR(qs)fIPAR(qs)=1-Po(qs) CAN_EYE

  3. The LAI Po relationship CAN_EYE

  4. Uncertainties in LAI estimates 0.08 0.04 0.02 0.01 -0.01 -0.02 -0.04 Error on Po -0.08 CAN_EYE

  5. CAN_EYE: suite of steps Start Setup Image selection Preprocessing Classification Processing & reporting End CAN_EYE

  6. Some results over Barrax Comparison of 2 independent processing CAN_EYE

  7. Comparison with other methods Comparison with LAI2000 over Barrax By B. Martinez Comparison with destructive measurements by V. Desmarez (CESBIO) CAN_EYE

  8. The P57 photos Using only the 57° direction allows to get better resolution But no more access to fAPAR (except at tetas=57°!) and fCover CAN_EYE

  9. P57 photos Hemispherical photos Evidence of finer resolution CAN_EYE

  10. Some results CAN_EYE

  11. Conclusion • Software available (for free) (www.avignon.inra.fr/can_eye) • Advantages: • Quick and easy to use • Accounting for clumping in LAI • Provides estimates of fAPAR and fCover • Traceability of the processing • Some encouraging validation results • Potential problems: • Importance of illumination conditions: diffuse for looking down-ward • Potential problems when small gaps (resolution) • Not yet full documentation and references!! • Future enhancements • Inclusion of Chen’s/Leblanc/Fernandes clumping computation • Processing P57 photos • Slope correction • More validation • Development of autonomous light sensors (dynamics) CAN_EYE

More Related