CONCLUSION
229
The purpose we wanted to achieve through this study is the discrimination
and localisation of the variants of a ground situated in the south of the
saharian Atlas by the spectral and diffractometric methods combination.
In fact, the obtained results show that the inaccuracy of the spectral
signatures curves from 6 points ( 6 spectral bands of Landsat TM) do not allow
us to stand out the weak shades of the observed themes on the ground. An
improvement can be done by the use of the future HIRIS data which corresponds
to 192 spectral bands. At the diffractometric analysis results level, the
quantitative valuations are not accurate, for there is no precise correlation
between the diffraction tops height and the material quantities. However, for
a caracterization study, the results are all the more precise that the taken
samples are representative allowing therefore a approximed extrapolation on
all the region.
AKNOWLEDGEMENTS
The spectral image analysis and the data processing of this study have
been carried out at the C.A.M.S of the E.H.E.S.S ( PARIS ). The authors are
grateful for the support, consultations and helpful suggestions provided by A.
SIMONIN, J.P. GILG, H. GEROYANNIS and all the team of the C.A.M.S.
REFERENCES
ESCADAFAL R. , 1989. Caractérisation de la surface des sols arides par
observations de terrain et de télédétection Edition de 1'ORSTOM 1989.
RICHARDS A.J.,1986.Remote Sensing Digital Image Analysis. Spinger Verlag 1989.
BILDGEN P.,MABRUT K.,GILG J.PGEROYANNIS H.,BOULEGUE J.,1990.Utilisation des
données spectrales MSS, TM ,SPOT exprimés en valeur de réflectance
éxo-atmosphérique pour l'étude diachronique de l'évolution des sols ,des zones
d'exploitation minière ou du couvert végétal.2èmes journées télédétection
de Bondy (4-6 Décembre 1990) pp 49-63.
BILDGEN P.,BOULEGUE J.,GEROYANNIS H., 1987.Recherche de minéralisations
bauxitiques par télédétection -exemple du contrôle géochimique et mathématique
des données radiométriques. 112e Congrès National des Sociétés Savantes, Lyon,
France.
