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Abstract

This paper presents the TREES project approach for monitoring humid tropical forest cover at regional and global scales based on Earth observation techniques.
The extent and distribution of tropical forest cover have been mapped using 1km-coarse resolution satellite imagery. However, apart from the detection of massive forest cover conversion, coarse resolution satellite images do not consistently allow the measurement of forest cover change over time.
The assessment of forest cover change was based on a new sampling scheme with sampling units independent of any particular satellite sensor. An equal probability sample frame has been chosen based on a tessellation of hexagons on a sphere. Prior stratification has been performed using a priori information on "forest cover area", derived from 1 km resolution satellite images, and on the "deforestation intensity" (concept of "active deforestation hot spots") derived from questioning regional and local experts.
Ninety-five sample sites have been statistically selected over the humid tropical domain of the three continents: Africa, South America and Southeast Asia. Corresponding pairs of high-resolution Landsat TM or SPOT imagery were acquired and analyzed in order to estimate forest cover change during the period 1992-1997. Interpretation and analysis was performed in a standardized way through a network of partners in each region. n.

Additional information

Authors: STIBIG H J, Global Vegetation Monitoring , Space Applications Institute JRC, Ispra;ACHARD F, Global Vegetation Monitoring , Space Applications Institute JRC, Ispra;EVA H, Global Vegetation Monitoring , Space Applications Institute JRC, Ispra;MAYAUX P, Global Vegetation Monitoring , Space Applications Institute JRC, Ispra;RICHARDS T, Global Vegetation Monitoring , Space Applications Institute JRC, Ispra
Bibliographic Reference: XXI IUFRO World Congress, Kuala Lumpur (MY), 7-12 August, 2000
Availability: Space Applications Institute, Joint Research Centre, 21 020 Ispra (Varese), IT
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