-
7/1/2014
1
UYGU 2014 – TÜBİTAK
Introduction to RS Softwares & Access to EO Data
Esra ErtenIstanbul Technical University (ITU)
Geomatics EngineeringE-mail: [email protected] on June
25, 2014
ISTANBUL TECHNICAL UNIVERSITY
UYGU 2014 – TÜBİTAK
Outline of Lecture
UYGU 2014 – TÜBİTAK
� How to obtain SAR data
� IDL & ENVI/SARscape overview
-
7/1/2014
2
UYGU 2014 – TÜBİTAK
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)
UYGU 2014 – TÜBİTAK
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.
-
7/1/2014
3
UYGU 2014 – TÜBİTAK
Data pricing (example: TerraSAR-X)
UYGU 2014 – TÜBİTAK
Scientific proposal (example: TanDEM-X)
https://tandemx-science.dlr.de
1. User registration2. Proposal filling
-
7/1/2014
4
UYGU 2014 – TÜBİTAK
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
UYGU 2014 – TÜBİTAK
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
-
7/1/2014
5
UYGU 2014 – TÜBİTAK
Free data – Supersıtes – Istanbul
UYGU 2014 – TÜBİTAK
Free data – Supersıtes – Istanbul
-
7/1/2014
6
UYGU 2014 – TÜBİTAK
Commercial software overview:IDL, ENVI, SARSCAPE
UYGU 2014 – TÜBİTAK
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, …)
-
7/1/2014
7
UYGU 2014 – TÜBİTAK
IDL overview
UYGU 2014 – TÜBİTAK
IDL overview
-
7/1/2014
8
UYGU 2014 – TÜBİTAK
IDL overview
UYGU 2014 – TÜBİTAK
A free IDL alternative: GDL
http://gnudatalanguage.sourceforge.net
� Compatible with IDL
� Complex functıons might not be fully compatible (e.g. advanced
graphics)
-
7/1/2014
9
UYGU 2014 – TÜBİTAK
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)
UYGU 2014 – TÜBİTAK
ENVI overview
-
7/1/2014
10
UYGU 2014 – TÜBİTAK
ENVI overvıew
UYGU 2014 – TÜBİTAK
ENVI overvıew
-
7/1/2014
11
UYGU 2014 – TÜBİTAK
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
UYGU 2014 – TÜBİTAK
SARSCAPE overvıew
-
7/1/2014
12
UYGU 2014 – TÜBİTAK
SARSCAPE overvıew
UYGU 2014 – TÜBİTAK
SARSCAPE overvıew
-
7/1/2014
13
UYGU 2014 – TÜBİTAK
SARSCAPE overvıew
UYGU 2014 – TÜBİTAK
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
-
7/1/2014
14
UYGU 2014 – TÜBİTAK
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.
UYGU 2014 – TÜBİTAK
Example 1:
-
7/1/2014
15
UYGU 2014 – TÜBİTAK
Example 2: