TerraSAR X Oceanography End of Comissioning Phaseearth.esa.int/seasar2008/participants/166/pres_166... · 2018-05-15 · TerraSAR X Oceanography End of Comissioning Phase Susanne

TerraSAR X OceanographyEnd of Comissioning Phase

Susanne Lehner

Institut für Methodik der Fernerkundung bzw. Deutsches Fernerkundungsdatenzentrum

Folie 2Institut für Methodik der Fernerkundung

TerraSAR-X

… is a sun synchron satellite with a right side looking X-band synthetic aperture radar (SAR)

StripMap Mode

I m a g i n g g e o m e t r y

ScanSAR Mode

ResolutionPolarizationIncidence angleScene extensionWavelength

2m-16mSingle/Multi20°-60°10,30,100 km0.031m

SpotLight Mode



First TerraSAR-X image processed on June 19th !

SM, HH pol, beam 19, 51º incidence

Novopetrovskiy/Russia near Volgograd

Tsimlyansk Reservoir / river Don



1. Introduction

2. TerraSAR X

3. SAR algorithms for wind field and sea state

4. Coastal Applications, Currents, Bottom Topography

5. Outlook

Outline



Basic Product PortfolioSSC: single look complex in slant range geometry

equidistant spacing in azimuth and in slant rangecomplex representation

MGD: multi look ground range detectedhomogenous ground spacingno interpolation artifacts due to image rotation.geo-referenced, but no precise geometry

GEC: geocoded ellipsoid correctedUTM projection, WGS84 reference, no DEM considered

EEC: enhanced ellipsoid correctedUTM projection, WGS84 reference, “coarse” DEM considered (e.g. SRTM, DTED-1 and -2)pixel localization accuracy down to meter leveldepends on DEM availability/quality



L1B SAR Processing: Stripmap Single PolarisationAcquisition

o Oberpfaffenhofen, Fünf-Seen-Lando Stripmap (HH)o Incidence angle: 39.5° .. 42.5 °o 100 MHz bandwidth

ProcessingMGD-RE:

o 56 km x 30 km (az, rg)o 7 m resolution, 3.25 m spacingo 2.9 (az) x 3.5 (rg) lookso 17360 lines x 10306 samples (358 MB)

MGD-SE:o 56 km x 30 km (az, rg)o 3 m resolution, 1.25 m spacingo 1 (az) x 1.5 (rg) lookso 45136 lines x 26796 samples (2419 MB)

B.Schättler



MGD - RE



ScanSARgeometric accuracy

Asc / Desc crossings

2007 10 22-27

AR scan_11 (17:10)AR scan_05 (17:02)DR scan_11 (05:42)

Th.Fritz





ENVISAT IMS subscene acquired on Apr, 04, 2004

ERS-2 SLC subscene acquired on Apr, 04, 2004

ship

TSX subscene acquired on Aug, 27, 2007 (~6kmx1km)

TSX subscene acquired on Aug, 27, 2007 (~17kmx7km)



SeaSAR Software ToolQuicklook Menue (TSX_MGD_20070827T171837 )



Norderney

TerraSAR X StripmapNorderney 28. Juli, 2007, 17:18 UTC

10 km

Topography

Wind Field

J.Schulz-Stellenfleth



Jul, 7, 2007Island of Hiddensee05:24 UTC

…around 2 hours time shift (west wind situation)

MODIS Level 2 FR TWP [g/m^2]

Detection of Clouds ( HH / VV / | HH – VV | )

GEC RE, 8 m res., 3.75 m spacing, 50 km x 15 km



Dual Polarisation Image of the Baltic ( HH / VV / | HH – VV | )

H.Breit



TerraSAR-X Stripmap 16.11.2007, 3:52 UTC.

Dual polarisation

10 km

( HH / VV / | HH – VV | )

Kerch

Oil Spill Strait of Kerch



Wind Field Estimation from SAR Images

13.00o 13.50o 54.50o

54.75o

12.50o 13.00o 13.50o 54.50o

54.75o

12.50o

Wind streakdetectionSAR image Wind direction

SAR imagecalibration

Normalized RadarCross Section

Incidence angle

Inversionof

CMOD-5

WindSpeed

Rügen, 1991 FRANCES, 2004



XMOD tuned by SIR C / X SAR Data and ECMWF data



Strait of Gibraltar

TerraSAR-X Stripmap mode scene acquired on July 9, 2007 at 06:29 UTC

S. Brusch



TSX Stripmap image, English Channel

30 km x 100 km TSX VV Stripmap image acquired on July 2, 2007, 17:35 UTC

Offshore Windfarm

Waves

Ships



Okinawa3.5 km x 2 km

TSX Stripmap image acquired overOkinawa on June 12, 2007



SRTM ATI Current MeasurementsShuttle Radar Topographie Mission (SRTM)

11-23 Feb, 2000

Along Track Interferometric SAR systems measure the across trackcomponent of current fields

headingur

CuxhavenBrunsbüttel

7 m



2-D Current Measurements with Tandem-X„Squinted Split Antenna Mode“

αIdea: Operate both TX-1 and TX-2in split antenna mode withTX-2 flown with a largesquint angle (in the frameworkof an experiment)

Similar to „Dual-Beam ATI“TX-1

TX-2

132-363 km

187-514 km

Distance not critical



Oceanography Algorithms at DLRToolbox

- Input, Quicklook generation- General Image Analysis

Windfield Analysis – New XMOD Algorithm- Calibration- Streak Detection – Wind Direction- Wind Field

Ship and Oil Detection- Threshold Algorithm

Sea State- Two Dimensional Spectra- Determination of Peak parameters



TerraSAR X Test sites ordered in AOs

New AO for general proposalsor see COFUR price list: sss.terrasar-x.dlr.de



Sth we cannot do with TerraSAR XSea State Statistic – 2 Years - 1 Million Radar Images



Benefits of TerraSAR-X High spatial resolution

Ocean waves in the Baltic, Black Sea, estuaries, harbours, …High resolution wind fields (offshore wind farming, coastal models, LM-DWD)Tidal inlets, dredging activitiesShip detection, Observation of ship wakesBeach erosion, rip currents, wave development

High temporal resolutionCurrent tracking by feature detection

All weather and day&night observation capabilitySAR the instrument for severe weather monitoringDisaster prevention, tropical and extratropical cyclones, extreme waves

Polarimetric and interferometric capabilityInvestigation of steep waves Sea ice parametersATI current measurements



ENVISAT IMS subscene acquiredon Apr, 04, 2004

ERS-2 SLC subscene acquiredon Apr, 04, 2004

TSX subscene acquiredon Aug, 27, 2007 (~2kmx5km)



Imaging Modes of TerraSAR-X for Basic Products

Documents

TerraSAR X Oceanography End of Comissioning Phaseearth.esa.int/seasar2008/participants/166/pres_166... · 2018-05-15 · TerraSAR X Oceanography End of Comissioning Phase Susanne