Mapping of flows of Mount Sinabung

(Indonesia) volcano using RISAT-1 CFRS-1 data

Presented by:

Sandhya Rani PattanaikGSD/GSAG/EPSA,

Space Applications Centre (ISRO),Ahmedabad

Overview

Introduction

Study area and Data used

Objective

Methodology

Results

References

Introduction

•After about 400-year dormancy, Sinabungvolcano erupted on August 29, 2010 and February and October, 2014, recently (Hwang HE, 2014).

MAP OF SUMATRA

INDONESIA

SUMATRA ISLAND

Study Area

LANDSAT(ETM+) Sensor Specification

Spatialresolution

30 m

Swath 180 km

Spectralcoverage

0.45-0.52 µm0.52-0.6 µm0.63-69 µm0.75-0.90 µm1.55-1.75 µm10.4-12.5 µm2.09-2.35 µm0.52-0.90 µm

Repeativity 16days

SRTM DEM Specification

Spatialresolution

90m

vertical accuracy +-16 m

Data Used

RISAT-1 (SAR ) SpecificationFine Resolution Stripmap Mode-1 ( circularpolarimetry)

3 m (azimuth) × 2 m (range)

Swath 25 km

Location map of Mount Sinabung Volcano, Indonesia (Left);Landsat ETM+ showing the Mount Sinabung Volcano (Right)

MethodologyObjective

This work focuses on how RISAT-1 CFRS-1 data helpful for the mapping of volcanic terrain and with the help of the hybrid decomposition technique and backscattering coefficient values extraction of the nature of the lava flows could be done .

Results

(A) 14-JUN-01,LANDSAT data and (B) 05-NOV-13,SAR data both are in the same scale, volcanic flows are clearly visible in SAR data compared to LANDSAT data due to vegetation cover

Mapping of volcanic flows

Hybrid decomposition of RISAT-1 CFRS-1 data using m-delta (m-δ) decomposition over Mount Sinabung, Indonesia shows different surface of the area based on the scattering mechanism. Red-even bounce that represent city, Blue- odd bounce that represent rough (intermediate) surface ,Green-diffused scattering that represent vegetation. Red: even; Green: diffused; Blue: odd scattering planes

3-D perspective view of Mount Sinabung(Indonesia) and adjoining area

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