A Novel in Situ FPAR Measurement Method for Low Canopy Vegetation Based on a Digital Camera and Reference Panel
Open Access
- 15 January 2013
- journal article
- letter
- Published by MDPI AG in Remote Sensing
- Vol. 5 (1), 274-281
- https://doi.org/10.3390/rs5010274
Abstract
The fraction of absorbed photosynthetically active radiation (FPAR) is a key parameter in describing the exchange of fluxes of energy, mass and momentum between the surface and atmosphere. In this study, we present a method to measure FPAR using a digital camera and a reference panel. A digital camera was used to capture color images of low canopy vegetation, which contained a reference panel in one corner of the field of view (FOV). The digital image was classified into photosynthetically active vegetation, ground litter, sunlit soil, shadow soil, and the reference panel. The relative intensity of the incident photosynthetically active radiation (PAR), scene-reflected PAR, exposed background absorbed PAR and the green vegetation-covered ground absorbed PAR were derived from the digital camera image, and then FPAR was calculated. This method was validated on eight plots with four vegetation species using FPAR measured by a SunScan instrument. A linear correlation with a coefficient of determination (R2) of 0.942 and mean absolute error (MAE) of 0.031 was observed between FPAR values derived from the digital camera and measurement using the SunScan instrument. The result suggests that the present method can be used to accurately measure the FPAR of low canopy vegetation.Keywords
This publication has 10 references indexed in Scilit:
- An assessment of the MODIS collection 5 leaf area index product for a region of mixed coniferous forestRemote Sensing of Environment, 2011
- Comparison of four global FAPAR datasets over Northern Eurasia for the year 2000Remote Sensing of Environment, 2010
- Dark current behavior in DSLR camerasPublished by SPIE-Intl Soc Optical Eng ,2009
- Refining light-use efficiency calculations for a deciduous forest canopy using simultaneous tower-based carbon flux and radiometric measurementsAgricultural and Forest Meteorology, 2007
- Recovering fluorescent spectra with an RGB digital camera and color filters using different matrix factorizationsApplied Optics, 2007
- MODIS leaf area index products: from validation to algorithm improvementIEEE Transactions on Geoscience and Remote Sensing, 2006
- Morphological investigation of three Tetramitus spp. which are phylogenetically very closely related: Tetramitus horticolus, Tetramitus russelli n. comb. and Tetramitus pararusselli n. sp.European Journal of Protistology, 2005
- A comparison of digital and film fisheye photography for analysis of forest canopy structure and gap light transmissionAgricultural and Forest Meteorology, 2001
- Modeling the Exchanges of Energy, Water, and Carbon Between Continents and the AtmosphereScience, 1997
- Estimation of leaf area index and light intercepted by shrubs from digital videographyRemote Sensing of Environment, 1995