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Results of Overflights 1975 
During the course of low-level flights carried out in 1975 both 
over the Rhenish Massif and adjacent lower-lying areas, it could 
be determined that a temporal shift in the visibilty of archaeo- 
logical sites from the air within the East Eifel occurred. The 
shift covered a period of approximately two weeks later, than 
the visibility of archaeological sites from the air in the ad- 
joining low-lying Neuwieder Basin. This phenomena was extremely 
apparent within 1975, as all areas were equally dried out due 
to a long period of drought. This situation can be termed a 
"Lemporal" aspect of spectral signatures and will often cause 
a lower rate of determination of signatures of any type - soil, 
geologic or archaeological - in adjoining areas on vertical 
aerial serial photography. (EVANS 1974; LORENZ, SOLTER 1977; 
LYONS, AVERY 1977. LYONS, EBERT 1978; MARTIN 1071; MARTIN, 
SOLTER 1977; SIEVERS 1977; WILSON 1975) 
Interpretation of LANDSAT Imagery 
In order to clarify the possibility of fault and fracture zones 
not shown on available geological maps; which also could not 
been mapped in overview on existing medium-scale (1: 24 000 - 
1: 38 000) vertical aerial photographs; a series of LANDSAT-1 
and -2 images was obtained. Previous field work had shown that 
many streams and rivers were definitely fault-controlled, in 
many cases where extensive erosion had taken place through 
thick horizontal beds of resistant sandstones, greywacke and 
schist; although at present the stream-beds carry virtually no 
water. 
Out of four available series of LANDSAT-1 and -2 images, it was 
possible to map an extensive series of geological lineations on 
only one MSS 6 image of 29.8.1975. The results of this mapping 
are shown on Figure 3; this differs from previous analysis of 
linears constructed by other researchers within the area of the 
East Eifel. (GUNTHER 1977; GUNTHER, ROSE 1975; KRONBERG 1977) 
The sketch map can be compared to the appearance of what may 
be termed "obvious" and "marginal" visibly linears on Figure 
4. The paper print is a 1 : 1 reproduction specially exposed 
and developed in low-contrast grey-scale range from the negative 
material 1 : 1 Million. With high-contrast reproduction many 
of the linears are no longer optically visible. A conventional 
visual examination of the LANDSAT series, using a mirror stereo- 
scope with both 1 x and 4 x magnification, showed that only 
four linears may be termed "temporally stable obvious spectral 
signatures" (lineations 1, 2, 4, 10). The remaining obvious 
linears are not visible on other LANDSAT images, including a 
series taken on 10.8.1975.