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SPACE BORNE RADAR INTERFEROMETRIC MAPPING OF PRECURSORY DEFORMATIONS OF A DYKE COLLAPSE, DEAD SEA, JORDAN. Closson, Abou Karaki, al-Fugha [email protected] [email protected]. Ikonos : 19-10-2000. The case study : the collapse of the salt evaporation pond 19 of the Arab poatsh Company. 1650m. - PowerPoint PPT Presentation
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SPACE BORNE RADAR SPACE BORNE RADAR INTERFEROMETRIC MAPPING OF INTERFEROMETRIC MAPPING OF
PRECURSORY DEFORMATIONS OF PRECURSORY DEFORMATIONS OF A DYKE COLLAPSE, DEAD SEA, A DYKE COLLAPSE, DEAD SEA,
JORDAN JORDAN
Closson, Abou Karaki, [email protected]
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The case study :
the collapse of the salt evaporation pond 19 of the Arab poatsh Company
1650
m
Ikonos : 19-10-2000
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The SEP costed 32 M Jordan DinarIt collapsed on March 22, 200055 M m3 brine to the Dead Sea in less than one our
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After the mid sixtiesThe Dead SeaDecrease from -392mTo -418m
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ERS Radar Images
Lisan Coastline
1961-1962
1993
1999
May, 29 1999
June, 30 1993
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SAR-based remote SAR-based remote sensing techniquesensing technique
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Remote sensing SARRemote sensing SAR
SAR = Synthetic Aperture RADAR (RAdio Detection And Ranging)
• SAR is a sensor able to generate high resolution images
• imaging sensor:
Allows the observation of the Earth surface in 2D
• exemple of another sensor :
Radar altimetre: provide data in one dimension. Allow generation of topographic maps
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• main characteristics of SAR images:
1. It is an active system (illuminate the area of interest with microwaves)
independant of solar illumination
allows measurement in day and night conditions
2. use micro-waves to penetrate through cloud cover
allows observations in cloud cover areas
remark: it alters the accuracy of measurements
3. Its a coherent system by opposition to visible remote sensing wich
use the incoherent light of the sun
allows the use of interferometry technic
SAR remote sensing - propertiesSAR remote sensing - properties
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4. SAR allows the observation of Earth surface properties that are not accessible to visible sensors
- rugosity, dielectric properties (through coherence images)
- possibilities to penetrate
- the vegetation (L band)
- ultra dry soil
- snow cap
5. The Sar resolution is independant of the distance between the sensor
and the objective
6. – Allows the utilisation of different polarization in transmission as well as
in reception :
HH, HV, VV, VH
- Allows the utilization of different frequencies
SAR remote sensing - propertiesSAR remote sensing - properties
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SAR applications
1. Geometric applications, based on the interferometric phase:
- Generation of digital terrain model (DTM)
Technic: SAR interferometry (InSAR)
- Control the deformations fields over the Earth surface
Technic: differential SAR interferometry (DInSAR)
2. Thematic application
- Change detection from coherence variation through time (soil erosion, flood)
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Deformation fields : principle
S
P
P’
M
M
S
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DInSAR
The differential interferometric phase is a sum of several components
Topo topographic phase Mov movement Atm atmosphere Noise noise of instruments
NoiseAtmMovTopoInt
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Subidence from 1995-1997
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