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Proceedings Paper

Global vegetation monitoring through multitemporal analysis of pathfinder AVHRR land database
Author(s): Yves Julien; José Antonio Sobrino; Malena Zaragoza; Juan Cuenca; Mónica Gómez; Juan-Carlos Jiménez-Muñoz; Mireia Romaguera; Qingfeng Shen; Guillem Sòria
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Paper Abstract

We have applied a Land Surface Temperature algorithm to the whole Pathfinder AVHRR Land (PAL) database, aiming at studying the evolution of the vegetation at a global scale. The Land Surface Temperature parameter, along with NDVI, will allow retrieving vegetation changes between July 1981 and September 2001. We have also built a classification which takes into account both vegetation variations and thermal patterns, from NDVI and Air Temperature at 2 meters height data. This classification allows differentiating areas which present close vegetation changes throughout the year, but totally different climates, as for example in mountainous and semiarid regions. The main quality of this classification is that it does not need any a priori information on the encountered vegetation, and thus can evolve from year to year. Through the 20 years of data, the evolution of Land Surface Temperature shows to be strongly affected by orbital drift and satellite changes. This will require an adequate correction to allow deeper study. On the other hand, NDVI does not show this trend, but aerosol absorption from Mount Pinatubo's eruption in June 1991 seems to corrupt temporarily the data in the northern hemisphere.

Paper Details

Date Published: 19 October 2005
PDF: 9 pages
Proc. SPIE 5976, Remote Sensing for Agriculture, Ecosystems, and Hydrology VII, 59761F (19 October 2005); doi: 10.1117/12.626809
Show Author Affiliations
Yves Julien, Univ. of Valencia (Spain)
José Antonio Sobrino, Univ. of Valencia (Spain)
Malena Zaragoza, Univ. of Valencia (Spain)
Juan Cuenca, Univ. of Valencia (Spain)
Mónica Gómez, Univ. of Valencia (Spain)
Juan-Carlos Jiménez-Muñoz, Univ. of Valencia (Spain)
Mireia Romaguera, Univ. of Valencia (Spain)
Qingfeng Shen, Univ. of Valencia (Spain)
Guillem Sòria, Univ. of Valencia (Spain)


Published in SPIE Proceedings Vol. 5976:
Remote Sensing for Agriculture, Ecosystems, and Hydrology VII
Manfred Owe; Guido D'Urso, Editor(s)

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