Figure 6. Surface current vector field Over the Coastal area of
Hormuz Strait in an overall view and low resolution and vector
density.
The analysis limit is set to 55-56 degrees of longitude and a 26-
27 degree of latitude. The density of vectors in vector field
depends on the minimum of planimetry accuracy by satellite
and the gridding scale. In figures 4 and 5 vectors are dense and
every component of the grid is a 3° x 3° square while in fig 6
every 25 pixels are averaged in to a pixel.in this figure the scale
of each component is 15° x 15° and vector colour is red.
The output is promising as it has accordance with dominant
winds direction of the area.
4. FUTURE WORKS
In the future works it would be a suggestion to work on a
method to find out the currents velocity out of surface models
through geometrical properties of wave shape. Also to develop
an algorithm of limiting the wave's analysis range to have more
accurate and time saving results in the computations. There is
even a potential of study on the higher order momentums and
their impact on the results 51 [16],
5. CONCLUSION
There have been various approaches of determining parameters
related to ocean's surface waters. Meanwhile some of them are
concentrated on the currents velocity and direction using
Doppler Effect or the Satellite Image Based Feature Tracking
methods.
The method presented in this paper unlike the Doppler Effect
method can give results even with one satellite data while the
Doppler Effect needs more than one satellite to get a
unidirectional result, because every Doppler observation gives
the direction and velocity in the radius path with respect of
sensor and for a unidirectional result more than a satellite
altimeter or sensor is needed.
Accuracy of the Satellite Image Based Feature Tracking method
is dependent on the temporal resolution of images taken of an
area and doesn't give a result in bad weather conditions. It also
needs a bunch of complex and time consuming feature tracking
computations which may get in to mistakes and needs human
observation whilst this method's results has a more reliable
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
results in comparison to the Satellite Image Based Feature
Tracking method.
The Doppler approach achieves sub centimetre parts of surface
water velocity and direction which is a high resolution
observation while determining the direction of surface waters
needs at least a few meters of resolution in the observations.
This quality lets the Doppler method have a significant
redundancy and over data in the process which is good but
unnecessary.
Altimetry satellites have a history and record of almost 18 year
which some of them earlier doesn't include Doppler and SAR
observations but elevations. By this method it is possible to use
these elevations for direction finding in the coastal areas.
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