P.I.(s): Jing M. Chen -- Canada Centre for Remote Sensing (CCRS)
Co-I(s): Margaret Penner -- Forestry Canada/PNFI; Josef Cihlar -- CCRS
Objectives: To develop and validate an algorithm that allows the retrieval of the spatial distribution of LAI from remotely sensed vegetation indices. Field measurements of LAI and FPAR (fraction of Absorbed Photosynthetically Active Radiation) were undertaken for major boreal forest species (jack pine, quaking aspen, black spruce) and stand types. For each species, stands with different percentages of forest cover were studied. Field measurements of effective LAI were taken both along transects and on a regularly spaced grid with the LAI-2000 sensor. For selected stands (OJP, YJP and OBS tower flux sites in both SSA and NSA), high frequency data (1 sample/cm) were obtained from a LI-COR quantum sensor carried by a person walking along transects beneath the overstory to improve LAI calculations and to characterize the architecture of the canopy. Measurements from the moving sensor (a sunfleck-LAI instrument dubbed the Talkman) were used to calculate FPAR.
These field measurements allow us to establish relationships between LAI, FPAR and remotely sensed radiances and their transformations including vegetation indices. These relationships will then be used to test the performance of spatial mapping of LAI by extrapolation. High resolution images will be provided by the CASI and MEIS airborne instrument which will be flown over the pre-established transects. Lower resolution images will be obtained from LANDSAT and/or SPOT and possibly from other remote sensing instruments available through other BOREAS studies.
To develop algorithms for calculating LAI and FPAR for BOREAS study areas and the region based on improved ground measurements.
Types of Data Collected:
|Site||Time||Equipment||Transect Length and Direction|
|SSA-OBS||IFC 1-3||TRAC, PCA, AgVision||300 m, SE from flux tower (FT)|
|SSA-OJP||IFC 1-3||TRAC, PCA, AgVision||200 m, SE from FT|
|SSA-YJP||IFC 1-3||TRAC, PCA, AgVision||150 m, SE from FT; 150 m, NW of FT|
|SSA-OA||TRAC, PCA||300 m, SW from FT|
|SSA-Fen||IFC 2||TRAC, PCA||2*50 m, 150 m to S of FT|
|NSA-OBS||IFC 1-3||TRAC, PCA, AgVision||300 m, SE from FT|
|NSA-OJP||IFC 1-3||TRAC, PCA, AgVision||250 m, SE from FT; 170 m, NW from FT|
|NSA-YJP||IFC 1-3||TRAC, PCA, AgVision||170 m, SE from FT; 170 m, NW from FT|
|NSA-Fen||IFC 2||TRAC, PCA||300 m, SE from FT; 250 m, W from FT|
|NSA-OA||IFC 1-3||TRAC, PCA||50 m, E-W|
In addition, PCA and/or TRAC measurements were made in IFC 2-3 in auxiliary sites T3U9S, T6R5S, T7R9S1, T7R9S2, T8Q9P, F7J0P, F7J1P, G2I4S, G4I3M, G9I4S, G1K9P, T9Q8P,T7T3S and G2I7M in the SSA and W0Y5A, T4U9S, T6T6S, T8S4S and T8T1P in the NSA.
In IFC (September) 1993, TRAC and PCA measurements were made in SSA-OBS, SSA-OJP, SSA-YJP, NSA-OBS, NSA-OJP and NSA-YJP.
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Last Updated: October 21, 1997