×

You are using an outdated browser that does not fully support the intranda viewer.
As a result, some pages may not be displayed correctly.

We recommend you use one of the following browsers:

Full text

Title
Proceedings of the Symposium on Progress in Data Processing and Analysis

116
with relatively large and mainly in the horizontal direction ba
orientated leaves. Previous investigations on sugar beet leaves 0 r
showed an emissivity value of £ - 0.86 at X - 3 cm . Hence they th
turned out to be clearly discernable from soil. The lower value of ¿ r
the microwave signal on the second date can therefore be explained tl
by an increase of plant cover degree because of the plant growth.
Based on the emissivity values which were obtained in the
preinvestigations on sugar beet leaves and soil as well as the 4^
field measurements of temperature and moisture for plants and soil
during the airborne missions the plant cover degree takes the
estimated values shown in fig. 4 which coincides well with the 0 f
terrestrial estimations. tl
ab
CL Experiment TELEGEO in
12
The experiment TELEGEO took place on two test sites in Poland in ta
1987. The radiometer complex including the microwave radiometer m0
was used on the test site Narev in the east of Poland near Q n
Bialystok from the 15.5. to the 30.5.1987. ou
The scientific program of the complex experiment was aimed at investigating the impact of drainage measures over the last 20 co
years in a territory comparable to the Havel depression area near w i
Potsdam. Of special interest in interpretating the microwave pr
radiometer data was the profile section of the Narev flood plain me
which is used as grass land. Because of the river nearness a
remarkable changing water influence could be expected. In addition i n
to the CIPE radiometer complex a soviet microwave radiometer with by
a wavelength of A - 30 cm could be used in the experiment. This j n
supported the conclusions about the wavelength dependency of the to
vegetation influence, i.e. for corn fields and pasture this ¿r
influence was significantly lower at the greater wavelength. The s 0
same tendency is also valid for the profile sections shown as co
example. While the vital grassland vegetation masks the soil c b
almost entirely in case of the 3 cm radiometer the higher moisture
content in the depression and with decreasing distance to the to
river is clearly deductable for the 30 cm microwave signal (fig v j_
5). Trees while not being unambigously identified in the 30 cm