GMTSARShortCourse

Scripps Institution of Oceanography August 16-18, 2017

•  Objectives:

•  understand the principles of SAR and InSAR

•  run GMT and GMTSAR on your own computer

•  perform 2-pass InSAR processing on your own computer

•  select free and open data from ERS, Envisat, and Sentinel-1

•  process ERS, Envisat, ALOS-1, TSX, CSK, RS2, S1A, ALOS-2

•  prepare large stacks of interferograms for time series

FirstGMTSARCourseSIO,June2011

SecondGMTSARCourseUNAVCO,June2013

ThirdGMTSARCourseUNAVCO,July2014

FourthGMTSARCourseSIO,August,2015

FiEhGMTSARCourseSIO,August,2016

SixthGMTSARCourseChineseAcademyofSciences,June,2017

GMTSARShortCourseOUTLINE

•  Lecture•  SAR and InSAR theory

•  overview of SAR, InSAR, processing with GMTSAR

•  Lab• setup UNIX, GMT, and GMTSAR – test cases

• learn to select SAR scenes

• GMTSAR overview, standard InSAR processing,

• batch processing

•  Student presentations

GMTSARShortCourseLABTODAY

•  setup:•  install UNIX and csh• make .tcshrc file•  install GMT5• make topography map•  install GMT5SAR•  run test cases

HOMEWORK1P-UNIXandcsh/tcshWewilluseUNIXcommandsforallInSARprocessingsooneshouldbeabletodothebasics.Thefollowingwebsitehasatutorial.hXp://www.ee.surrey.ac.uk/Teaching/Unix/GothrougheachtutorialunlessyourarealreadyaUNIXwhiz.Youwillneedtohaveabasictexteditoravailableforthisexercise.CommonUNIXtexteditorsarevioremacs.Thefollowingwebsitehasanextensivelist.hXp://en.wikipedia.org/wiki/List_of_text_editorsNotethattodothisexerciseyourcomputermusthavetheC-shell(orbash)installedaswellasaC-compilerinstalled.Ifyouhavetroublewiththeseinstallabonspleasesende-mailquesbons.Tutorial8isespeciallyimportant.Eachtypeofunixwillhaveslightvariabonsinthe.tcshrcor.cshrcfile.Thedefaultshellonmanysystemstodayisbash.GMTSARisbasedonthetcsh/cshshellsomakesurecshisinstalled.AEergoingthroughoutthetutorialandsefngupyour.tcshrcor.cshrc(or.bashrc)file,pleasesendmeacopyofthatfilewithembeddedcommentsonyourcustomaddibons.

HOMEWORK2P-GenericMappingTools(GMT5)RemoveoldversionsofNETCDFandGMTfromyourcomputerunlessyouare100%sureyouhavethelatestcompleteinstallabonincludingthesourcecode.ManyproblemsrelatedtotheinstallabonofGMT5SARareduetohavinganoldinstallabonofGMT.Installabonscanbedoneinavarietyofways.Hereisawebpagedescribingtheinstallabonopbons.hXp://gmt.soest.hawaii.edu/projects/gmt5sar/wikiLEARNGMT5Tomakesureeverythingisworkingproperly,youmustcloseallyourterminalwindowsandstartnewones.Makesureyouarerunningcsh/tcshineachwindowbytypingthecommandcshortcsh.Thentypethecommand‘gmtgrdinfo’tomakesuretheGMT5programsareinyourpath.IfyouarenotfamiliarwithGMT5,thengothroughtheGMT5Tutorialatthefollowingwebsite.hXp://gmt.soest.hawaii.edu/doc/latest/tutorial.htmlThelastpartofthisexerciseistomakeamapoftheareawhereyouliveusingtopographydatafromthefollowingwebsite.hXp://topex.ucsd.edu/gmtsar/demgen/Usethison-linetooltoextracta1-degreegridofelevabonsfortheareawhereyoulive.UseGMT5tomakeashadedreliefmapandsendtheresulbngpostscriptfile.ThissametoolwillbeusedtopreparedigitalelevabonmodelsforInSARprocessing.Wewillshowallthereliefmapsduringtheshortcourse.HOMEWORK3-GMTSARThethirdassignmentbeforetheworkshophas3parts.Part1istoinstallGoogleEarth.Part2istoreadthereviewpaperbyBurgmannetal.,2000.Hereisthelink.hXp://topex.ucsd.edu/insar/burgmann_insar_rev.pdfPart3istoinstallGMT5SAR.Gotothefollowingwebsiteandfollowtheinstallaboninstrucbons.hXp://gmt.soest.hawaii.edu/projects/gmt5sar/wiki

HOMEWORK3-GMTSARThethirdassignmentbeforetheworkshophas3parts.Part1istoinstallGoogleEarth.IfyouhaveUBUNTU16.04thenusetheseinstrucbons.hXp://www.configserverfirewall.com/ubuntu-linux/install-google-earth-ubuntu-16-04/Part2istoreadthereviewpaperbyBurgmannetal.,2000.Hereisthelink.hXp://topex.ucsd.edu/insar/burgmann_insar_rev.pdfPart3istoinstallGMT5SAR.Gotothefollowingwebsiteandfollowtheinstallaboninstrucbons.hXp://gmt.soest.hawaii.edu/projects/gmt5sar/wikiAddGMT5SARtoyourpathNote:IfyouareusingaMacOSXandmacport,makesurechangethefollowingenvironmentalvariablesinyour.cshrcor.tcshrcor.bashrcfilebeforecompiling:fortcsh/cshsetenvGMT5SARYourPathTo/GMT5SARsetenvPATH$GMT5SAR/bin:"$PATH"forbashexportGMT5SAR=YourPathTo/GMT5SARexportPATH=$GMT5SAR/bin:$PATH

GMTSARShortCourse

Student Presentations (pair or group) – Friday AM

•  Group A. – process one of the sample data sets

•  Group B. – select new SAR data and process

•  Group C. – InSAR batch processing

GMTSARShortCourseLectureToday

•  Brief introduction to SAR and InSAR

•  Applications of InSAR

•  Appendix A: Principles of Synthetic Aperture Radar

passiveandacbveremotesensing–opbcalandmicrowave

amplitude and phase

coherence and pixel matching

ERS amplitude image

zoom of amplitude image

InSAR uses phase

deforma?onandtopography

SARandInSAROverviewConclusions

•  atmosphere is very transparent to microwaves

•  radars measure range and azimuth

•  radar image has amplitude and phase

•  amplitude depends on roughness, slope, and dielectric constant.

•  phase differences reveal topography

•  phase differences reveal deformation

•  deformation from: volcanoes, earthquakes, groundwater - next

.cshrc

.tcshrc

.bashrcwhatisthe.for??

##exampleof.bash_profile#aliasla='ls-alh'aliasrm='rm-i'aliaslt='ls-lht'aliasll='ls-l'exportPATH="/Users/elindsey/scripts/:${PATH}”exportGMT5SAR=/usr/local/GMT5SARexportPATH=$GMT5SAR/bin:"$PATH"exportLD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib