International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
can interfere with the results of the tests. It is also important to 
have a sufficiently large number of ground control points 
available so as to obtain adequate reliability values. The more 
than 7000 ground control points used in the present work 
represent a sufficient gurantee in this sense. 
We emphasize the obligatory use of many accurate check 
points. The use of a very limited number of points implies a 
very unreliable error control that can make the results useless. 
We suggest a minimum of 100 points which corresponds to a 
confidence value of about 0.10. 
7. ACKNOWLEDGEMENTS 
This paper is part of the Project 2PR03AL105 co-funded by the 
Junta de Extremadura (Consejería de Educación, Ciencia y 
Tecnología — II Plan Regional de Investigacion, Desarrollo 
Tecnológico e Innovación de Extremadura) and FEDER (Fondo 
Europeo de Desarrollo Regional). 
JUNTA DE EXTREMADURA x 
FEDER 
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