The BOREAS Information System
Remote Sensing Science (RSS)


RSS-2: Dynamics of Canopy Photosynthesis and Stomatal Conductance in the Boreal Forest: A Study Using Airborne, Multi-Angle, Imaging Spectroradiometer Data


P.I.(s): James R. Irons -- NASA/Goddard Space Flight Center
Co-I(s): Phillip Dabney -- NASA/GSFC; J. Martonchik -- NASA/JPL; K. Jon Ranson -- NASA/GSFC; Charles Walthall, Carol Russell -- Univ. of Maryland

Objectives: To obtain multi-angle, high spectral resolution reflectance data of important forest components of a boreal landscape and relate these data to biophysical states (albedo, FPAR, leaf area index). The Advanced Solid State Array (ASAS) system was flown over representative sites in BOREAS to acquire the data. Radiative transfer models are being used in combination with the multi-angle data to develop algorithms for biophysical parameter estimation.

RSS-2 Pictures


The NASA C-130, housing
the ASAS instrument
The ASAS instrument, sticking out
of the belly of the C-130

RSS-2 Data Sets

  • ASAS Level-1b images
  • BRDF spectra (atm. corr. refl. factor)

  • Get some RSS-2 data using FTP (BOREAS Investigators only, password required). [FTP Help]

    Check the ASAS Web site for more information.

    RSS-2 BOREAS Operations 1994


    Objectives:
    Study bidirectional reflectance properties of snow background, and boreal forest canopies through seasons. Simulate MISR data by acquiring data at MISR view zenith angles.

    Equipment Used and Data Collected:
    Multiangle, hyperspectral digital image data, at-sensor radiance for 62 spectral channels (404-1025 nm) in up to 10 view angles for FFC-T data and up to 8 view angles for IFCs 1-3 data.

    Southern
    Site    		 Coverage
    by Date    		 # Flight
    Lines    		 GMT Range
    (start times)    		 Northern
    Site    		 Coverage
    by Date    		 # Flight
    Lines    		 GMT Range
    (start times)
    SSA-OBS 4/19/94
    5/31/94
    6/01/94
    6/06/94
    7/21/94
    9/13/94    		 3
    3
    3
    3
    3
    3    		 17:11-17:35
    17:16-17:38
    14:47-15:07
    15:32-15:57
    18:46-19:11
    17:31-17:59    		 NSA-OBS 4/20/94
    6/07/94
    8/04/94
    9/06/94
    9/17/94    		 3
    3
    3
    1
    3    		 17:17-17:54
    16:04-16:41
    16:23-16:14 *
    16:08
    17:13-17:35
    SSA-OA 4/19/94
    5/31/94
    7/21/94
    9/16/94    		 3
    3
    3
    3    		 18:43-19:08
    15:29-15:59
    17:46-18:17
    17:10-17:40    		 NSA-OA 6/08/94
    9/06/94
    9/17/94    		 3
    2
    3    		 17:09-17:29
    15:39-15:54
    15:57-16:16
    SSA-OJP 4/19/94
    5/31/94
    6/01/94
    6/04/94
    7/21/94
    7/24/94
    9/13/94    		 3
    3
    3
    3
    3
    3
    3    		 17:57-18:28
    16:25-17:02
    15:20-15:41
    14:48-15:11
    19:24-19:49
    16:33-16:58
    18:09-18:32    		 NSA-OJP 4/20/94
    6/07/94
    8/04/94
    9/17/94    		 3
    3
    3
    3    		 17:32-18:22
    15:25-15:52
    16:47-17:10 *
    16:30-17:04
    SSA-YJP 6/01/94
    7/21/94
    9/13/94    		 3
    3
    3    		 15:52-16:14
    19:59-20:22
    19:17-19:50    		 NSA-YJP 4/20/94
    6/07/94
    9/17/94    		 3
    3
    3    		 18:30-18:58
    17:30-17:55
    18:14-18:52
    SSA-Fen 6/04/94
    6/06/94
    7/21/94
    7/24/94
    9/13/94    		 3
    3
    3
    3
    3    		 15:32-15:57
    16:12-16:35
    20:35-21:10
    15:57-16:23
    18:43-18:53    		 NSA-Fen 4/20/94
    6/07/94
    9/17/94    		 3
    3
    3    		 19:10-19:35
    16:54-17:17
    17:44-18:05
    SSA-YA 7/23/94
    7/24/94    		 1
    3    		 15:48
    17:08-17:33    		 * means there was smoke obscuring the target site.
    AVIRIS-Cal 5/26/94
    7/23/94
    9/16/94    		 1
    1
    2    		 17:25
    16:20
    20:01-20:12
    Candle Lake 5/31/94
    9/16/94    		 1
    1    		 16:08
    ?


    Known Problems and Caveats:
    Compared to limited ground measurements, ASAS agreed very well with the ground observations for wavelengths 490-870 nm. Below 490 nm and above 870 nm, ASAS reflectance factors fell below the response observed by ground sensors. USE CAUTION working with spectral channels below 490 nm or above 870 nm, due to low signal-to-noise ratios and uncertainty in the absolute radiometric calibration.

    Click on a team designation to go to that page.

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    Last Updated: October 21, 1997