Fig. 7 gives the area Maquinchao-Jacobacci as 
recorded by NOAA. it is evident, that there exists 
a considerably higher level of abstraction than for 
LANDSAT MSS. The interpreted classes refer to 
the scheme given for Fig. 6, and without the basic 
knowledge from LANDSAT MSS and ground truth 
there is no chance for reliable interpretation of NOAA 
imagery. 
Acknowledgments 
The author wishes to thank INTA experts in 
Bariloche, Trelew and Rio Gallegos for providing data 
and personal information during his stay in Patagonia 
in 1991. Besides he thanks R. Beuchle/Karlsruhe for 
doing the data processing as a part of his Diploma 
Theses. 
Literature 
UNCOD: Draft Plan of Action to Combat Desertifi- 
cation (1977)A/Conf. 74/2 and 2.36, Nairobi 1977 
MENSCHING, H.: Desertification - Ein welt- 
weites Problem der ökologischen Verwüstung in den 
Trockengebieten der Erde. Wissenschaftliche Buch- 
gesellschaft, Darmstadt 1990 
SPECK, N. H. et al.: Sistemas Fisiogräficos de la Zona 
Ingeniero Jacobacci - Maquinchao. INTA, Buenos 
Aires 1982 
MORELLO, J.: Perfil Ecológico de Sudamérica. Insti- 
tuto de Cooperación Iberoamericana, Barcelona 1984 
BAHR, H.-P. and Th. VOGTLE (Eds.): Digitale Bild- 
verarbeitung, 
Anwendung in Photogrammetrie, Kartographie und 
Fernerkundung, Wichmann Verlag. Karlsruhe 1991 
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