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speed. Under alkaline and oxidizing conditions prevailing in
the sea water in this area, chemical reactions between the
substances introduced and the water occur. These are char-
acterized by conspicuous colors: the green divalent iron is
oxidized to reddish brown trivalent iron, which then rapidly
precipitates as colorful red-brown oxide hydrate, whereas
dissolved titanium forms similar white colored oxide hydrate.
These processes seemed to offer a simple pathway for testing
the suitability of presently available remote sensing tech-
niques for determining chemical parameters from the sea sur-
face. Any possibilities for future regular monitoring of this
dumping area by means of remote sensing were also to be in-
vestigated.
Flight Camp a ign and Ground Trout
The flight campaign for this experiment was conducted on 25
August 1976, at very favorable weather conditions. During the
dumping activities, the acid waste tanker was repeatedly and
at different altitudes passed and surveyed by the research
airplane. The aircraft was a DO 28 "Skyservant" operated by
Deutsche Forschungs- und Versuchsanstalt fir Luft- und Raum-
fahrt (DFVLR, German Research and Testing Institution for
Aeronautics and Spaceflight) from its Oberpfaffenhofen re-
search center. The aircraft was equipped with a number of
multispectral cameras recording on black-and-white and false
color film, a photogrammetric camera loaded with color nega-
tive film, and particularly with an eleven-channel-scanner.
At the same time, the Inorganic Chemistry Group of DHI was,
together with other scientists, on board of Research Vessel
"Gauss" of DHI working in the investigation area to obtain
the necessary "ground truth" data, i.e. to perform chemical
and physical measurements in and near the sea water surface.
Parameters determined were mainly dissolved and freshly pre-
cipitated iron, acidity (pH value), temperature and salinity.
These parameters were measured continuously from the moving
ship by & method for Fe and pH developed by WEICHART (2).
For calibration, some water samples from the surface were
