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INTRODUCTION 
Gérard GUYOT 
Chairman of 1SPRS Working Group V1I/1 
The Sixth International Symposium on Physical measurements and Signatures in Remote sensing took place 
from January 17 to 21, 1994, in the Centre de Congrès Henri Oreiller in Val d'Isère (France). It has been 
sponsored by the Ministère de l'Enseignement Supérieur et de la Recherche and materially organised by the 
Agence Française de L'Espace (CNES) with the support of : 
- National Aeronautics and Space Administration (NASA) 
- Centre National de la Recherche Scientifique (CNRS) 
- Institut National de la Recherche Agronomique (INRA). 
The Symposium has also been sponsored by some scientific societies : 
- American Society for Photogrammetry and Remote Sensing (ASPRS) 
- Association Québécoise de Télédétection (AQT) 
- Canadian Remote Sensing Society (CRSS) 
- European Association of Remote Sensing Laboratories (EARSeL) 
- Remote Sensing Society 
- Société Française de Photogrammétrie et de Télédétection (SFPT) 
In addition the attendance of scientists of the former Soviet Union has been supported by the International 
Science Foundation (Washington, DC). 
This Symposium follows the five colloquia organised since 1981 on Physical Measurements and Signatures in 
Remote Sensing. The scientific topics selected are mainly dealing with : 
- the analysis of the relationships between the specific properties of a target (vegetative canopy, soil, 
rocks, water, snow, ice...) and its characterization by different remote sensing techniques (spectral, 
directional, polarimetric,...responses), active or passive in various wavelength domains (from ultraviolet 
to microwaves); 
- the assessment of factors affecting the spectral response of an object (atmospheric effects, geometry of 
the measurement, measuring technique...); 
- the development of interpretation models. 
These kinds of investigations are necessary to lay the foundations for any application of remote sensing 
techniques and are of interest for the specialists having a wide range of interests: measurement physics, 
agronomy forestery, geology, hydrology, oceanology, meteorology,... It is the reason why the different sessions 
were organised on approaches rather than application domains. 
The contributed papers were presented during four days in plenary and poster sessions. The morning of the fifth 
day has been devoted to the presentation of the conclusions on the different scientific topics of the symposium. 
As in the preceding meetings, the Symposium sessions were organised in order to facilitate the exchanges and 
the scientific discussions. To reach this goal, most of the contributions were presented in poster sessions, the 
plenary sessions being reserved for a limited number of review papers or papers presenting significant new 
approaches. 
Each day of the Symposium included one plenary session followed by one poster session in the morning and 
againin the afternoon, except for the first day where the morning poster session was suppressed because of the 
opening ceremony. The contributed papers were selected by the International Scientific Co mmi ttee (40% of the 
submitted papers wererejected) and distributed as a function of the 8 scientific topics proposed : 
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