without a polygon line hardly to see in
fig. 4. It clearly shows the interrelation
between high surface temperatures and low
net radiation. Industrial sites have net
radiation values around 500 W/m“, urban
and agricultural areas have similar condi-
tions with values around 600 W/m“, the
°C
15
17.5
20
22.5
25
cool surfaces of forests and water sur-
faces show maximum values in the range of
625 to nearly 700 W/m’. These features can
be derived from all cities or urban areas
in the investigation area of the REKLIP
project (Parlow,
1996a; Parlow, 1998).
525
550
575
600
625
650
675
Figure 4: Surface temperature (left) and net radiation (right) of Basle computed from
Landsat-TM, July 7°" 1984.
It seems to become important in the future
to take satellite data not only as images
and pictures of grey values, as it is of-
ten done, but to go more into detail of
the physical processes which are directly
influencing the visible information. Mis-
interpretations and an incompetent analy-
sis of data, especially when they are used
for applications, will not promote future
usage and potentials of remote sensing
techniques. Modern and easy to handle
software products and the unproblematic
availability of data imply the danger of
increasing quick-and-dirty products. The
remote sensing community must be well
aware of these circumstances and must try
to avoid that remote sensing suffers not
too much damage.
References
Parlow, E. 1996. The regional climate pro-
ject REKLIP - an overview. Theoretical and
Applied Climatology, Vol. 53 (1-3), pp. 3-
7.
Parlow, E. 1996a. Net Radiation in the
REKLIP-Area - A Spatial Approach Using sa-
tellite data. In Parlow, E. (ed.): Pro-
gress in Environmental Remote Sensing Re-
search and Applications, Balkema Publish-
ers, Rotterdam.
Parlow, E. 1998. Analyse von Stadtklima
mit Methoden der Fernerkundung. Geographi-
sche Rundschau 50, H. 2, pp. 89-93.
REKLIP 1995. Klimaatlas Oberrhein Mitte-
Süd. Offenbach-Zürich-Strasbourg.
Parlow, E., D. Scherer, H.-D. Beha, H.
GofBmann & M. Braun 1996. Urban Climatolo-
gical parameters derived from multisensor
satellite data of ERS-1 and Landsat-TM.
European Space Agency, ESA-SP 383, pp. 173
- 178.
Parlow, E., D. Scherer, U. Fehrenbach, H.-
D. Beha 1997. Satellite-Based Climate Ana-
lysis of Basel/Switzerland. Proceedings
ERS-Symposium Florence 1997, ESA SP-414,
Vol. I, pp. 271-274.
Scherer, D., E. Parlow & H.-D. Beha 1996.
Roughness parameter derivation from ERS-1
and Landsat-TM satellite data for the ag-
glomeration of Basel/Switzerland. In: Par-
low, E.(ed.): Progress in Environmental
Remote Sensing Research and Applications,
pp. 325-330, Balkema Publishers, Rotter-
dam.
