Red and photographic infrared linear combinations for monitoring vegetation

Journal Article · Tue May 01 04:00:00 EDT 1979 · Remote Sensing Environ.; (United States)

DOI:https://doi.org/10.1016/0034-4257(79)90013-0· OSTI ID:6014916

Tucker, C J

The relationships between various linear combinations of red and photographic infrared radiances and vegetation parameters are investigated. In situ spectrometers are used to measure the relationships between linear combinations of red and IR radiances, their ratios and square roots, and biomass, leaf water content and chlorophyll content of a grass canopy in June, September and October. Regression analysis shows red-IR combinations to be more significant than green-red combinations. The IR/red ratio, the square root of the IR/red ratio, the vegetation index (IR-red difference divided by their sum) and the transformed vegetation index (the square root of the vegetation index + 0.5) are found to be sensitive to the amount of photosynthetically active vegetation. The accumulation of dead vegetation over the year is found to have a linearizing effect on the various vegetation measures.

• Research Organization: NASA, Goddard Space Flight Center, Earth Resources Branch, Greenbelt, Md.
• OSTI ID: 6014916
• Journal Information: Remote Sensing Environ.; (United States), Journal Name: Remote Sensing Environ.; (United States) Vol. 8; ISSN RSEEA
• Country of Publication: United States
• Language: English

Related Subjects

510100* -- Environment
Terrestrial-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
CROPS
ELECTROMAGNETIC RADIATION
INFRARED RADIATION
INFRARED SPECTRA
NEAR INFRARED RADIATION
OPTICAL PROPERTIES
PHOTOGRAPHY
PHYSICAL PROPERTIES
PLANTS
RADIATIONS
REMOTE SENSING
SPECTRA
SPECTRAL REFLECTANCE