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Satellite
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"City"*
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| C-Band
(wavelength = 5.7 cm). The Radar is an active sensor. It sends a
pulse, horizontally polarized, and measures the returning pulse. The
returning pulse, interacts with the surface and can either come back
in horizontal polarization or vertical. This makes for four images -
C-HH, C-HV, L-HH, L-HV (band - sent signal polarization, return signal
polarization). Radar signal is most effected by surface roughness. I
have attached two jpg images - one is a display of each of the four
bands. They are grayscale and contain all the information received by
the satellite in this configuration. The second image is the one you
saw - a false RGB representation of the same information in the bw
pictures. The square "box" in C-HV is silt and mud entering
from the Jordan river. There is some noise in the image, which can be
seen in the L-HV band (the stripes in the right-hand upper corner of
the lake). Don't forget that SAR measures backscattering. Any change
in the surface of the sea will show up as a change in the image
(waves, different salt concentrations, boat tracks, etc.). Once again
- radar does not penetrate the waters of the Dead Sea. In order for
SAR to "see" the bottom of a water body, very rigid
conditions have to be met. -----Michael Lazar, of
the Dead Sea Research Center |
| * This area coincidentally showed up in a magnetometer
scan produced by the Dead Sea Research Center at Tel Aviv University,
which showed an exact square area of 0.8 x 0.8 kilometers. This
was NOT on our original schedule of dives, but when the Jordanian
Government withdrew their permission it was decided to investigate, as
the area was half in Israel and half in Jordanian waters. -----
Michael Sanders, Director |
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