Figure 2: Man-made Count Rate Map of the Pakri Peninsula
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Figure 3: HPGe Gamma Energy Spectrum Typical of the Seven Measurement Locations near the training site
shown in Figure 3 is typical of the activity in the seven
measurements made near by, but outside the training site;
only naturally occurring gamma emitters and the gamma ray
of "Cs due to world-wide fallout are present (Feimster,
1995). The most intense anomaly was detected over the
solid waste storage facility located at the former Paldiski
Naval Reactor Training Site. Due to the shielding of that
source, the spectral identity of the contributors could not be
established. The results of the radiological survey are
indicated as contours in Figure 2. This information will be
useful in guiding further ground-based investigations.
5.2 MSS Survey
Detailed MSS analysis has only recently been initiated.
However, there are several preliminary findings that can be
discussed. A variety of image processing techniques are
being used to enhance specific spectral features for individual
target applications. These techniques range from simple
contrast stretch to more complex algorithms, such as
principal components analyses and target specific spectral
Indices. The intent is to characterize a variety of key
Indicators of environmental conditions including vegetation
Stress, surface disturbances, and soil moisture.
One preliminary result indicates stressed vegetation patterns
both within and outside the Paldiski Naval Reactor Training
Site. These patterns seem to be consistent with site use.
Another preliminary result shows the movement of a diesel
fuel spill in the north-east corner of the site. The fuel spill is
relatively noticeable in the visible section of the
electromagnetic spectrum. However, further from the site
313
there are similar spectral signatures that are found in the
SWIR bands. This is not apparent in the visible spectrum
because the vegetation canopy is spectrally confused with it.
Analysis of the thermal data to depict moisture content has
also been initiated. This data, in conjunction with elevation
data, will be useful in identifying probable drainage pathways.
6. DATA PROCESSING AND INTEGRATION
The integrated analysis and presentation of RSL multisensor
data requires special attention to the multiple data types and
formats involved. For example, the Paldiski survey included
both aerial and ground photography (film format), radiological
sensor data (point spectral responses), and multispectral
scanner data (digital spectral imagery).
Maps and imagery provide the standard base for presenting
RSL radiological survey results. Coincidentally acquired
photography or satellite imagery is usually preferred to identify
current land cover conditions. The use of aerial photography
and multispectral scanner imagery also provides an
opportunity for multidisciplinary assessments of ground
conditions.
7. DISCUSSION
Environmental assessments can be useful for identifying
potential radionuclide transport problems and environmental
pathways affecting risk assessments. The multisensor data
can also be useful for general site characterizations needed
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996
