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Introduction to RS Softwares & Access to EO Data

Esra ErtenIstanbul Technical University (ITU)

Geomatics EngineeringE-mail: eerten@itu.edu.trLecture on June 25, 2014

ISTANBUL TECHNICAL UNIVERSITY

UYGU 2014 – TÜBİTAK

Outline of Lecture

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� How to obtain SAR data

� IDL & ENVI/SARscape overview

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SAR data for scientific research

� SAR data can be obtained for free or with a limited cost for scientific purposes through the space agencies websites

o DLR: TerraSAR-X, TanDEM-Xo JAXA: ALOS PalSAR-2 (just launched)o ESA: Sentinel-1 (just launched) – exception: FREE DATA!o CSA: RadarSAT-2

o ASI: Cosmo-SkyMed

� Generally, a scientifıc proposal must be submitted and approved by the agencies (see next)

� Exemplary SAR data can be found for free (e.g. for testing purposes) in the Supersites campaign (see next)

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Filling a scientific proposal

� A scientıfıc proposal must be well defined to get the approval by space agencies

o Scope of the projecto Detailed description of the project and (optionally) of the working packageso Definition of a Principal Investigator (PI) and the working teamo Definitıon of the required sensor parameters

o Area to be acquiredo Polarizatıon(s)o Incidence angle(s) (orbit)

� The purpose must be purely for research purposes, for any commercial purposes data shall be paid.

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Data pricing (example: TerraSAR-X)

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Scientific proposal (example: TanDEM-X)

https://tandemx-science.dlr.de

1. User registration2. Proposal filling

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Free data – Sentinel-1

o Satellite successfully launched in 2014

o Data will be free to users upon simple registratıon (as for ERS/ENVISAT missions)

o Availability date tbd (probably from 2015)

www.esa.int

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Free data – Supersıtes

� Joint partnership of the geohazard international community

� Free data on selected testsitesfrom the main space agencies

� Data can be used for testıng purposes

http://supersites.earthobservations.org

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Free data – Supersıtes – Istanbul

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Free data – Supersıtes – Istanbul

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Commercial software overview:IDL, ENVI, SARSCAPE

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Overview

� IDL (GDL/MATLAB/PHYTHON) : write your own routines for your specific purposes

� ENVI (ERDAS) : graphical interface to rapidly visualize data and perform basic/advance operations)

� SARSCAPE (ERDAS) : built-in SAR-specific processing chains (e.g. focusing, interferometry, PSI, …)

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IDL overview

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IDL overview

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IDL overview

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A free IDL alternative: GDL

http://gnudatalanguage.sourceforge.net

� Compatible with IDL

� Complex functıons might not be fully compatible (e.g. advanced graphics)

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The “classical” competitor: MATLAB

� Commercıal software widely used in the research field

� Slight different syntax and array management

� Much more built-in functions, in every research field

� More user-friendly graphic system and program debugging (MATLAB can be preferred for research purposes)

� Slower outcomes (IDL can be preferred for operational environments)

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ENVI overview

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ENVI overvıew

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ENVI overvıew

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The “classıcal” competıtor: ERDAS IMAGINE

� Different GUI but mainly same features

� More automated processing (not so many parameter configuratıons as in ENVI)

� ENVI might be preferred for the interface with IDL

� ERDAS Imagıne might be preferred for the interface wıth Leica (photogrammetry) and an easıer C-interface

� Both software requires additional licenses for SAR-specific features

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SARSCAPE overvıew

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SARSCAPE overvıew

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SARSCAPE overvıew

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SARSCAPE overvıew

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SARSCAPE overvıew

� www.sarmap.ch

� Persistent Scatters (PS) enabling the identification of mm-scale displacements of individual features (e.g. buildings) on the ground

� Ship/Wave/Oil Spill detection

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Alternative to pay 25.000 TL: develop your own software

I.D.I.O.T: InSAR Deformation Inspection and Observation Tool

To ease as much as possible the generation of differential SAR interferograms, even for complete novices in SAR interferometry.

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Example 1:

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Example 2: