Helicopter MMR Reflectances During the Forest Ecosystem Dynamics - Multisensor Aircraft CampaignEntry ID: FEDMAC_HELO_MMR
Abstract: Forest Ecosystem Dynamics Multisensor Airborne Campaign (FED MAC): Helicopter mounted Modular Multiband Radiometer Reflectance Measurements
The Biospheric Sciences Branch (formerly Earth Resources Branch) within the Laboratory for Terrestrial Physics at NASA's Goddard Space Flight Center and associated University investigators are involved in
a research program entitled Forest Ecosystem ... Dynamics (FED) which is fundamentally concerned with vegetation change of forest ecosystems at local to regional spatial scales (100 to 10,000 meters) and temporal scales ranging from monthly to decadal periods (10 to 100 years). The nature and extent of the impacts of these changes, as well as the feedbacks to global climate, may be addressed through modeling the interactions of the vegetation, soil, and energy components of the boreal ecosystem.
Surface directional radiances and reflectances were measured with a Modular Multiband Radiometer (MMR), in six of the spectral bands nominally corresponding to the Thematic Mapper bands, and the seventh band in the middle infrared region.
The Barnes Modular Multiband Radiometer (MMR) was designed to acquire multispectral radiance data over the visible, near infrared, middle infrared and thermal regions of the electromagnetic spectrum. It produces analog voltage responses to scene radiance in 8 spectral bands. Voltages from thermistors attached to
the instrument chopper and detectors are recorded to provide a means of compensating for thermal effects on sensor response and for calculation of target surface temperatures. The 8 bands are approximately 0.45 '-' 0.52,0.52 0.60, 0.63-0.69, 0.76-0.90, 1.15-1.30, 1.55-1.75, 2.08-2.35, 10.4-12.5 um. Bands 1-4 have silicon detectors and bands 5-7 have lead sulfide detectors. The MMR's dimensions are 26.4 cm by 20.5 cm by 22.2 cm and the device weighs 6.4 kg. The MMR is battery powered. Data logging was via a microprocessor-based Omnidata Polycorder where analog to digital conversions take place.
The NASA Bell UH-1B helicopter optical remote sensing system supported a data acquisition system consisting of a bore-sighted MMR; a color video camera; and two 35 mm flight research cameras loaded with color film (one with a 1 inch focal length and the other with a 6 inch focal length). Controller units for all the optical devices are rack-mounted inside the helicopter and are wired such that a single switch closure triggers all devices. The switch closure also activates an audible tone which is recorded on one of the two audio tracks of a Beta-format video recording system. The other audio track of the VCR was used to record cabin intercom conversations among the helicopter crew. If one desires to examine site conditions in greater detail, the higher resolution 35 mm still photography can be reviewed.
Data Set Citation
Dataset Originator/Creator: Darrel L. Williams
Dataset Title: Helicopter mounted Modular Multiband Radiometer Reflectances
Dataset Series Name: FED MAC Home Page
Dataset Release Place: NASA/GSFC
Dataset Publisher: NASA/GSFC
Data Presentation Form: ASCII TablesOnline Resource: http://forest.gsfc.nasa.gov/
Start Date: 1990-07-13Stop Date: 1990-09-16
ATMOSPHERE > ATMOSPHERIC RADIATION > REFLECTANCE
ATMOSPHERE > ATMOSPHERIC RADIATION > SOLAR RADIATION
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED RADIANCE
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > REFLECTED INFRARED
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE FLUX
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE RADIANCE
Distribution Media: WWW
Distribution Format: ASCII
Role: TECHNICAL CONTACT
Email: cwalthall at asrr.arsusda.gov
Remote Sensing And Modeling Laboratory BLDG 007 BARC-WEST RM 008 10300 Baltimore Blvd
Province or State: MD
Postal Code: 20705-2350
Email: Darrel.L.Williams at nasa.gov
NASA Goddard Space Flight Center Mailstop 614.0
Province or State: MD
Postal Code: 20771
Walthall, C.L., M. Kim, D.L. Williams, B.W. Meeson, P.A. Agbu,
J.A. Newcomer, and E.L. Levine. 1993. Data sets for modeling: a
retrospective collection of bidirectional reflectance and forest
ecosystem dynamics multisensor aircraft campaign data sets. Remote
Sensing of Environment; 46:340-346.
Williams, D.L. and C.L. Walthall. 1990. Helicopter-based ... multispectral
data collection over the Northern Experimental Forest:
preliminary results from the 1989 field season. IGARSS'90--Remote
Sensing Science for the Nineties, Vol. I. Univ. of Maryland,
College Park, MD. pp. 875-878.
Lawrence, W.T., D.L. Williams, K.J. Ranson, J.R. Irons, and
C.L. Walthall, 1994. Comparative analysis of data acquired by three
narrow-band airborne spectro-radiometers over sub-boreal
vegetation. Remote Sensing of Environment; 47:204-215.
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Creation and Review Dates
Last DIF Revision Date: 2017-08-23