|Title||Télédétection au Sahel : un outil d'inventaire et de surveillance des ressources|
|Author||Prévost, C; Yergeau, M|
|Source||10th Canadian Symposium on Remote Sensing/10e Symposium canadien sur la télédétection; vol. 2, 1986 p. 927-936|
|Alt Series||Earth Sciences Sector, Contribution Series 20040601|
|Alt Series||RESORS 1057312|
|Meeting||10th Canadian Symposium on Remote Sensing - 10e Symposium canadien sur la télédétection; Edmonton, Alberta; CA; May 5-8, 1986|
|Abstract||The Ethiopian famine revealed to humanity the fragile environmental equilibrium which exists in certain parts of the world. The famine also revealed to aid organizations the necessity of improving
their resources monitoring systems. In this regard remote sensing is an important tool for both inventory and monitoring of the planet's resources.|
The LANDSAT system, in operation since 1972, is equipped with a Multispectral Scanner which is
very useful for terrestrial applications. With respect to monitoring resources, LANDSAT satellites provide a means of obtaining information which can reduce the vulnerability of certain populations, particularly those in areas where climatic
variations often result in dramatic crop losses. However, the LANDSAT satellite is limited by cloud cover and by its 16 day repetitive viewing cycle. Although these limitations are acceptable for long term planning and resource management, they
result in insufficient data and therefore seriously handicap the monitoring of those resources which develop and change rapidly and are widely distributed.
Since 1979, acquisition systems have allowed the environment to be explored from a global
perspective: daily, through the use of NOAA (AVHRR) data, or locally and in a linger time frame with MSS and TM data. The proposed approach described in this article allows resources to be monitored on a global or regional scale almost daily with
NOAA-AVHRR. Problem or potential problem areas identified at this scale can then be monitored in greater detail using MSS-TM-LFC.
This approach does not prevent environmental disaster but does give managers planning tools which can be used in
dealing with a crisis, thus reducing the adverse effects caused by environmental imbalance.