Earth Observatory of Singapore

Nina Lin 22 Jan 2018

EOS – Our Mission

Our Mission The Earth Observatory of Singapore conducts fundamental research on earthquakes, volcanic eruptions, tsunamis and climate change in and around Southeast Asia, towards safer and more sustainable societies.

Director Prof. Kerry Sieh

EOS Geodesy Group 3

Prof. Emma Hill Principal Investigator

Nina Lin Research Fellow

Eric Lindsey Research Fellow

Edwin Tan Senior Assistant Manager

• The Advanced Rapid Imaging and Analysis (ARIA) system was developed by JPL and Caltech to provide automatic processing of geodetic data for disaster response and monitoring

• We are collaborating to clone their systems over to EOS and work together to further strengthen the system

• This will give us the capability to map ground deformation, damage, and floods from natural disasters across the Southeast Asia region using Synthetic Aperture Radar data

The Japanese Space Agency’s ALOS-2 SAR satellite

New collaboration with JPL and Caltech - ARIA 4

September 30th to October 7th 2017

Space based remote sensing in volcanology

ARIA: Main Features 6

ARIA: Under the Hood

ISCE

PyAPS

InSAR Scientific Computing Environment

• The major InSAR processing application • Process data from most SAR sensors & modes • V. 2.1.0 incorporates spectrum-split ionospheric

correction for ALOS stripmaps

• The InSAR time-series application • Process InSAR data from different processing

softwares (ROIPAC, ISCE, GMTSAR, GAMMA)

• The atmospheric correction application • Support different modes of correction

(spectrometer, weather model, empirical model) • Embedded in GIAnT

7

Product Example: Interferogram 8

Interferometric SAR uses temporal changes in the phase of the returned SAR signal to map ground displacements from earthquakes, volcanoes, subsidence…

SAR interferogram for the Mw 7.8 2015 earthquake of Nepal.

Generated by Eric Lindsey (EOS).

Product Example: Displacement Time-Series 9

InSAR line-of-sight (LOS) displacement time-series is the level-2 product based on the inversion results of multiple level-1 InSAR products

InSAR LOS Displacement Time-series for the Agung Crisis.

Generated by Nina Lin &

Eric Lindsey (EOS).

Product Example: Displacement Time-Series

07 08 09 10 11 12 13 14 15 16 17 18

timeline

10

-10

0

cm/yr Airport

West Jakarta: 2007.01 - 2011.02 (ALOS1) Generated by Nina Lin &

Eric Lindsey (EOS).

Product Example: Displacement Time-Series

07 08 09 10 11 12 13 14 15 16 17 18

timeline

10

-10

0

cm/yr Airport

West Jakarta: 2010.08 - 2014.02 (TSX) Generated by Nina Lin &

Eric Lindsey (EOS).

Product Example: Displacement Time-Series

07 08 09 10 11 12 13 14 15 16 17 18

timeline

10

-10

0

cm/yr Airport

West Jakarta: 2015.02 - 2018.01 (ALOS2) Generated by Nina Lin &

Eric Lindsey (EOS).

Product Example: Displacement Time-Series

07 08 09 10 11 12 13 14 15 16 17 18

timeline

10

-10

0

cm/yr Airport

West Jakarta: 2014.12 - 2017.10 (Sentinel) Generated by Nina Lin &

Eric Lindsey (EOS).

Damage Proxy Maps (DPMs)

DPMs use information from changes in the coherence of the SAR signal before and after a disaster to map areas of damage

DPM for the Mw 7.1 2017 Mexico earthquake

Generated by Sang-Ho Yun and

the JPL ARIA team

Product Example: Damage Proxy Map 14

Product Example: Damage Proxy Map (due to Wild Fire)

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DPM for the December 2017 Southern California Wild Fire Generated by Sang-Ho Yun and the JPL ARIA team

FPMs use changes in the amplitude of the returned SAR signal to map flood extents

FPM for 2017 flooding in Houston, Texas, USA, from

Hurricane Harvey

Generated by Sang-Ho Yun and the JPL ARIA team

Product Example: Flood Proxy Map 16

Our Vision 17

• Create automatically generated interferograms, time-series, DPMs and FPMs to help disaster monitoring and response throughout the region

• Work closely and share out information with responding agencies and other stakeholders

• Innovate the techniques to

further improve the system

2017 floods in India (Reuters)