Using InSAR Technique for Water Bodies


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Using InSAR Technique for Water Bodies

  

Parviz Tarikhi

October 8, 2010

 

On January 12, 2010, Tuesday a huge quake measuring 7.0 rocked the Caribbean Haiti. It destroyed mainly the capital of Haiti, Port-au-Prince toppling buildings and causing widespread damage and panic. Using the radar data provided by the European Space Research Institute (ESRIN) affiliated to the European Space Agency (ESA) I have carried out since early March 2010 investigation and research work on the available data which includes 47 single look complex images (SLCI) of the C-band Advanced Synthetic Aperture Radar (ASAR) image mode system of Envisat satellite in addition to other type of data. 

The results sound good and the detailed study report is planned to be prepared as soon as the data investigation, and product generation work is wholly completed. Below is seen the samples of the early products that are generated by combining the Envisat ASAR images of 26 January 2010 (two weeks after the quake) and 2 March of 2010 (49 days after the quake). Both of the images are collected after the advent of the quake. However in the third image (coherence DInSAR) below it can be seen that in the time interval of 35 days the area have moved which can be estimated through the common interferometry method to be 35.89 cm in surface at the area of the Port-au-Prince.                    

InSAR product of Haiti area in North America (Image credit: Parviz Tarikhi) 

Amplitude Topography image product; Port-au-Prince is seen in the middle right between two water bodies.                 

  

InSAR product of Haiti area in North America (Image credit: Parviz Tarikhi) 

Coherence image; the coherence degree in the Port-au-Prince area is high particularly at the lakeside. Brightness in the coherence image is the indication of high correlation of the corresponding pixels of the image pairs.  
 

InSAR product of Haiti area in North America (Image credit: Parviz Tarikhi) 

Coherence DInSAR image; five fringe cycles can be counted on the Port-au-Prince area, that estimates 14 cm displacement in the slant range, while its horizontal coordinate is calculated to be 35.89 cm (hypotenuse) and the vertical coordinate 15.22 cm. The estimated displacements after the main quake on January 12, implies that the land surface movements still continues in the aftermath of the main quake.   

  

InSAR products of Haiti area in North America (Image credit: Parviz Tarikhi)

The above image is a DEM generated for the area of study, Nord-Ouest Department (North-West Province). The cities of Cap du Mole Saint-Nicolas and Bale-de-Honne are situated in north-west and south respectively. The products are generated by combining the Envisat ASAR images taken at the same day of 4 March 2010 with only 8 seconds of time interval and the virtual baseline of 13.23m while the parallel baseline amounts only 2.1cm that is too close and comparable to the radar wavelength of 56mm for Envisat.                

            

However, the results achieved by combining the available SAR image pairs of the area that are acquired successively with maximum 16 seconds of temporal baseline looks interesting and considerable for the water bodies. Although it is usually assumed that the application of SAR Interferometry technique is not worthy for water bodies, for the Haiti study area the results of combination of 16 image pairs focusing on the water bodies are given in current album. The detail of the combination is shown as inset at the bottom of each product collection image. The parallel baseline component that plays the key role in producing interferograms is highlighted by red color. In each case the direction of the movement of the sea water is distinguishable and the displacement in the direction of the line of sight is assessable, particularly for the closed water bodies (Etang Saumatre in Haiti and Lago Enriquillo in the Dominican Republic-images G and J, pages xi and xiv). Knowing the direction of the motion of sea water surface and its long term trends could be useful for coastal zone management and the interaction of sea water and coastal areas. There could be other potential benefits that need to be further investigated and studied. By increasing the coverage area of the successive SAR images access to the information about the behavior of the sea water movement in larger areas would be possible. This idea needs to be examined and tested for various cases and different locations.            

Map of Haiti; the capital letters in red on the map indicates the locations for which the SAR Interferometric image pair combinations are made.  

  

A

 

 B

 

C

 

D

 

E

 

F

 

G

 

H

 

I

 

J

 

K

 

L

 

M

 

 N

 

O

 

P

 

The results of the same study as for Haiti were acquired for Chile. Below the samples of the early products that are generated by combining the Envisat ASAR image pairs of 26 March 2010 and 30 April 2010 with 251.05 m of virtual baseline is given.

 

InSAR product of Haiti area in North America (Image credit: Parviz Tarikhi) 

Coherence image

 

InSAR product of Haiti area in North America (Image credit: Parviz Tarikhi) 

Phase-flat image

 

InSAR product of Haiti area in North America (Image credit: Parviz Tarikhi) 

Amplitude-phase image

 

For the Chile study area following the disastrous earthquake of 27 February 2010, the results of combination of image pairs for 2 locations are given in this album while further investigations  continues. The detail of the combination is shown as inset at the bottom of each product collection image. The parallel baseline component that plays the key role in producing interferograms is highlighted by red color. In each case the direction of sea water is distinguishable and the displacement in the direction of the line of sight is assessable.

 

 Map of Chile; the capital letters in red on the map indicates the locations for which the SAR Interferometric image pair combinations are made.  

 

A

 

B

 

  

  

  

            

 

Note: Apart from any fair dealing for the purposes of research or private study, or criticism or review, this publication may only be reproduced, stored or transmitted in any form or by any means with the prior permission in writing of the author.

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Parviz Tarikhi

 

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