97 
:i on and 
Worldwide there has been a growing number of applications- of remote 
sensing systems »¡sensors) in geology especially for substrate mapping 
and detection of structures. Spectral measurements on selected groups 
of substances are made for prospecting and mapping geologic formations. 
1. Investigations of dpectral properties on sediments for geologic 
The investigations made at the Central Institute for Physics of the 
part of the electromagnetic spectrum. The original filters K 1—7 
correspond to those wavelength of the Thematic Mapper (TM) whereas the 
additional filters F 1-7 cover the range from 2.0 ¡urn - 2.35 jum. • The 
under normal conditions of illumination and different soil moisture 
values. Parallel to that the moisture was determined in the laboratory. 
substrate moisture. Increasing moisture decrease remission values 
preventing certain substrates like lime stones, clay and quarts it sand 
from being unambigously di f feren'ti ated. A correction of the measured 
values enabled the influence of the substrate moisture on the spectral 
remission values to be eliminated. The so called water feature WM2 
formed by the ratio of the red and the infrared band is appropriate to 
perform this in the wavelength range of the original filters K 1—7. The 
regression line (Fig. 3) proved the dependance between the feature WM2 
d er 
Earth (ClPE) have dealt with sediments which can be divided into the 
f o 1 .1 ow i n g m a i n g r ou p* s; 
c 1 a y 
c: 
iimestone 
quartz i t and sand stones 
Iimonitic sand s and 
h u m u s s o i 1 s /1 
bandwidth of these filters are 50 nm. The measurements were carried out 
Figure 
shows that the spectral signatures depend strongly on the