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SPOT data, large scale air photos and field surveys are used to demonstrate the existence of converging spectral trajectories of vegetation in red-infrared space. These trajectories are determined by soil background reflectances and vegetation amounts. The converging point is shown to correspond to APAR = 80-90%. It can be used to calibrate NDVI in terms of APAR. Observations on Landsat MSS and AVHRR imagery show it is possible to determine the converging point on these data, but accurate radiometric calibrations are needed to yield confident APAR-NDVI relationships.

Additional information

Authors: BARTHOLOME E, Institute for Remote Sensing Applications, JRC I-21020 Ispra (IT)
Bibliographic Reference: Paper presented: 1989 Remote Sensing Society, Annual Conference, Bristol, (GB), Sept. 13-15, 1989
Availability: Available from (1) as Paper EN 34814 ORA
Record Number: 198911268 / Last updated on: 1994-12-16
Original language: en
Available languages: en
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