da B e nd = AP caf p 
ring seasons of least cover, 
Spring and autumn, only a maxi- Use c 
mum of 20-25 % of soil is bare, tigu 
(JAKOB and LAMP, 1978), it is 3m x 
mandatory to use indirect tral 
methods based on analogy, tivel 
as done in aerial photo inter- Histc 
pretation (SCHMIDT-FALKENBERG, ie 
1980). contz 
Land use, type of crop and lity 
parcelling pattern indicate by st 
important differences in soil occur 
quality. Less significant tent 
is the spectral reflection of cular 
bare soil, because it occurs range 
only sporadically, but it can spect 
be related to surrounding par- formt 
| celling and land use. are I 
| origi 
Computer work was performed tors 
to emphasize pattern and struc- nal 6 
‘tures on the one hand, and to ; 
emphasize and group spectral Histc 
response of bare soil, land use, effec 
| and erop types with the aim to image 
il facilitate visual analogy-inter- methc 
| pretation for soils. Map 1: Locality of the investigated area 5. BE 
hl. BASIC PREPROCESSING AN 
Basic preprocessing of image raw-data is necessary to arrive at conclusions The X 
about the further direction of interactive work. In the. scene from the 28, ties 
| 8. T5 the primary FCC of channels 4, 5 and T in blue green and red respectively | chant 
(we regret, that all images had to be reproduced as black * white photos) shows princ 
only little contrast (photo 1). the s 
the r 
varie 
1976) 
spect 
  
Photo 1: Unimproved FCC (channels 4, 5 Photo 2: Use of "gain and bias" on 
and 7), 28. 8. 75, Neumünster area (co- the basis of photo 1 
lor image) 
  
398 
ERE NN E CASE J^ EEE an s