currents and objects - videsinstituts.lv · [barale & gade, 2014] ... (1996-99) sar...
TRANSCRIPT
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Marine Applications
Currents and Objects
Martin Gade Uni Hamburg, Institut für Meereskunde
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Friday, 9 Sep, Morning:
1 - History & Basics Introduction Radar/SAR History Basics Scatterometer
2 - Wind and Waves SAR Wind Fields Storms, Tropical Cyclones Ocean Surface Waves Oceanic Internal Waves Marine Surface Films Rain
Friday, 9 Sep, Afternoon:
3 - Currents and Objects Surface Currents Sea Bottom Topography Ship Detection Oil Pollution Monitoring Sea Ice
4 - Practicals Sentinel 1 Toolbox: Georeferencing, Mosaics Image Interpretation: Wind Fields, Oil Pollution, Sea Ice, Objects
SAR Maritime Applications
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 2
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Surface Currents
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 3
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Surface Currents
[Robinson, 2003]
[Gade et al., 1998]
Slicks & eddies
ERS SAR Image (C-VV; 70 km × 70 km) Bering Strait (24 June 1997, 22:30 UTC, © ESA)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 4
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Hydrodynamic Processes at the Sea Surface
[Robinson, 2003]
Imaging by SAR
[Robinson, 2003]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 5
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Along-Track Interferometric (ATI) SAR TerraSAR-X / TanDEM-X
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 6
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Along-Track Interferometric (ATI) SAR
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 7
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Along-Track Interferometric (ATI) SAR
[Romeiser, 2013]
TanDEM-X SAR Image (X-VV; 30 km × 30 km)
Pentland Firth (Scotland) (26 February 2012, 06:41 UTC, © DLR)
Derived line-of-sight current field
Reference current field from numerical tide computation system
Interferometric phase image
radar look direction
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 8
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Along-Track Interferometric (ATI) SAR
[Romeiser, 2013]
TanDEM-X SAR Image (X-VV; 10 km × 10 km) Pentland Firth (Scotland) (26 February 2012, 06:41 UTC, © DLR)
Derived line-of-sight current field: full-resolution Doppler velocity image
radar look direction
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 9
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Along-Track Interferometric (ATI) SAR
[Romeiser, 2013]
SRTM (X-VV; 70 km × 70 km) Dutch Wadden Sea (15 February 2000, 12:34 UTC)
Reference current field from a numerical circulation model
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 10
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Along-Track Interferometric (ATI) SAR
[Barale & Gade, 2008]
SRTM (X-VV; 55 km × 30 km)
Elbe river
Current field from a
numerical model
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 11
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Radial Doppler Velocities from SAR Imagery
[Barale & Gade, 2014]
Mean radial Doppler velocities derived
from 4 years (‘07-‘11) ASAR data
Mean westward current; Agulhas Current (S Africa)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 12
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Surface Currents Take-Home Messages Derivation of sea-surface currents: tracking of features Along-Track Interferometry Doppler velocities
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 13
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Sea Bottom Topography
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 14
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Sea Bottom Topography
[Jackson & Apel, 2004]
Seasat SAR Image (L-HH, 100 km × 100 km) English Channel (August 1978, © NASA)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 15
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Sea Bottom Topography
[Robinson, 2003]
ERS-1 SAR Image (C-VV, 100 km × 100 km) Taiwan Tan Shoals (27 July 1994, 14:31 UTC, © ESA)
[Jackson & Apel, 2004]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 16
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Sea Bottom Topography
ERS-1 SAR Image (C-VV, 100 km × 100 km) Chinese Coast (8 July 1995, 0234 UTC, © ESA)
[Robinson, 2003]
[Jackson & Apel, 2004]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 17
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Bathymetry Maps from ATI Measurements
[Romeiser, 2013]
Airborne ATI-derived current vector field
(German island of Sylt, experiments May 2001,
3.5 km × 3.5 km)
Selected reference depth points
Depth map derived from reference points
Depth map from echosoundings
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 18
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Bathymetry Maps from Multiple SAR Imagery
[Heygster et al., 2010]
Waterline Method
1996 1999
Extract waterlines from multiple SAR images
acquired at different tidal phases (precise water levels needed)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 19
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Bathymetry Maps from Wave Statistics
[Lehner et al., 2013]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 20
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Sea Bottom Topography Take-Home Messages Current variations: roughness variations Current models (shallow waters) Waterline method (intertidal flats) Wave refraction (coasts)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 21
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Ship Detection
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 22
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Radar Backscattering from Metal Constructions
[Jackson & Apel, 2004]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 23
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Ship Wakes
[Mallas & Graber, 2013]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 24
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Multi-Polarization SAR Imaging of Vessels
[Mallas & Graber, 2013]
Radarsat-2 SAR Imagery (C), © CSA
VV HH
VH HV
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
High-Resolution SAR Imaging of Large Vessels
[Mallas & Graber, 2013]
COSMO-SkyMed SAR Image (X-VV) © COSMO-SkyMed
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 26
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Hijacked Vessels
[Barale & Gade, 2014]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 27
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Vessels vs. AIS Info
[Barale & Gade, 2014]
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 28
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Marine Vessels Speed estimate from azimuthal shift
[Robinson, 2003]
[Soloviev et al., 2008]
𝑥𝑎𝑚 = −𝑢𝑅𝑅
𝑉
𝒇𝑫 = −𝟐𝒖𝑹
𝝀
𝒇𝑫
𝑥𝑎𝑚
𝑥𝑎𝑚
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Ambiguities (‘Ghost Images‘)
[Barale & Gade, 2014]
Ambiguity distance:
∆𝒙 = ∆𝒕𝑨𝑴𝑩𝑰 ∙ 𝒗𝟎 =𝑷𝑹𝑭
𝑭𝑴∙ 𝒗𝟎
𝑷𝑹𝑭 : pulse repetition frequency 𝑭𝑴 : temporal derivative of Doppler frequency 𝒗𝟎 : zero Doppler velocity
TerraSAR-X: Δx ≈ 5.2 km
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Ship Detection Take-Home Messages High-resolution SAR used Vessel monitoring (SAR vs. AIS) Vessel speeds (“ship-off-the-track“)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 31
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Oil Pollution Monitoring
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Monitoring of Marine Oil Pollution
ERS SAR Image (C-VV, 50 km × 50 km) South China Sea (25 May 2007, 14:44 UTC, © ESA)
[Caruso et al., 2013]
Operation Oil Pollution
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Monitoring of Marine Oil Pollution
TerraSAR-X Image (X-VV) Mud Lake, LA, USA (1 August 2010, 12:08 UTC, © DLR)
[Caruso et al., 2013]
Accidential Oil Pollution
Wellhead struck by tugboat Pere Ana C.
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Monitoring of Marine Oil Pollution
TerraSAR-X Image (X-VV) Gulf of Mexico (23 April 2010, 12:08 UTC, © DLR) Extent on 25 April 2010:
[Caruso et al., 2013]
Accidential Oil Pollution
Deepwater Horizon ( ) incident
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Image Examples
( 30 km x 40 km )
11 January 1998
15 February 1998
31 May 1998
5 July 1998
2 October 1998
18 October 1998
ERS-2 SAR Images (C-VV, 30 km × 40 km) Northwestern Mediterranean Sea (© ESA)
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Oil pollution in European marginal seas (1996-99)
SAR Applications
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Mean oil pollution of the Mediterranea Sea 1999-2004
SAR Applications
[Barale & Gade 2008]
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Use multi-frequency radar techniques to discriminate between biogenic and anthropogenic surface films
Wave Damping by Surface Films
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Scatterometer Experiments
MULTI³SCAT of Uni Hamburg
• flown on BO 105
• 5 frequencies: (L, S, C, X, Ku band)
• 4 polarisations (HH, HV, VV, VH)
• incidence angle: 23° ... 65°
• nominal flight height: 150 m
• Ø footprint: 1.6 m ... 128.9 m
• transmit power: 10 mW ... 150 mW
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Field Experiments With Marine Surface Films
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Field Experiments With Marine Surface Films
1994: 2 SIR-C/X-SAR missions
Field experiments with quasi-biogenic slicks and anthropogenic oil spills
Just minor differences in radar contrast at high wind speeds (12 m/s)
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Field Experiments With Marine Surface Films
Model can explain
monotonous increase of damping curves (no Marangoni maximum!)
similar damping behavior of biogenic and anthropogenic films
TOLG IFO
m : parameter describing reduction of friction velocity Δn : parameter describing reduction of wave breaking
[Gade, 1996]
𝝈(𝟎)
𝝈(𝒔)=
𝜳𝟎(𝒌)
𝜳𝒔(𝒌) ≈
𝜷𝒔 − 𝟐𝜟𝒔𝒄𝒈
𝜷𝟎 − 𝟐𝜟𝟎𝒄𝒈∙ 𝒎𝜟𝒏−𝟒 𝟐𝒖∗
𝐜𝐨𝐬 𝝋 𝒌
𝒈
𝜟𝒏
Modeling damping ratios at high wind speeds
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 43
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Oil Detection System
[EMSA, 2014]
Low wind
Moderate wind
High wind
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
ERS-2 SAR image (C-VV, 100 km 100 km) North Sea 24 March 1997, 10:40 UTC, © ESA
Wind-Speed Dependence of Radar Contrast
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Defined as ratio A/B of the wind speed distribution of detected oil spills (A) and model winds (B)
Any oil pollution in the three ‘Clean Seas‘ test sites is visible only at wind speeds up to 9-10 m/s !
Normalized Visibility
Statistical Analyses
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Oil Detection System
[Caruso et al., 2013]
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Oil Pollution Monitoring Take-Home Messages Routine monitoring, pollution statistics Oil-cleanup support Detection @ 2 m/s - 10 m/s
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Sea Ice
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Sea Ice
Left: Air bubbles in Baltic first-year ice (ice slab diameter 8 cm) Right: Small-scale ripples on sea ice (laser measurements in the Baltic)
[Dierking 2013]
Roughness scales and volume inclusion
Left: Deformed sea ice in the Fram Strait (refrozen lead with rafted thin ice; thicker, ridged ice)
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Remote Sensing of Sea Ice
Airborne optical imager 19 March 2007, 12:20 UTC spatial resolution < 1.3 m
[Dierking 2013]
Comparison of optical and SAR imagery (N Svålbard)
Spaceborne SAR sensor ENVISAT ASAR WS (C-HH) 19 March 2007, 11:22 UTC spatial resolution 150 m
Airborne SAR sensor ESAR (DLR) 19 March 2007, 12:26 UTC spatial resolution 2 m
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Remote Sensing of Sea Ice
ENVISAT ASAR images (C-HH, 90 km × 90 km, 19° < θ < 28°), © ESA
[Dierking 2013]
Influence of melting conditions (Beaufort Sea)
ENVISAT ASAR images (C-HH, 90 km × 90 km, 35° < θ < 43°), © ESA
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 52
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
SAR Imaging of Sea Ice
ERS SAR image (50 km × 65 km) Arctic sea ice (© ESA, NASDA) left: ERS (C Band, VV pol)
right: JERS-1 (L Band, HH pol)
SAR images (80 km × 80 km) Arctic sea ice at 82°N 12°E (19 September 1996, © ESA, CSA) left: ERS (C Band, VV pol)
right: Radarsat (C Band, HH pol)
[Barale & Gade 2008]
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Remote Sensing of Sea Ice
ENVISAT ASAR images (C-HH)
Ronne Polynya, Wedell Sea © ESA
18 February 2008, 06:09 UTC
19 February 2008, 05:38 UTC
[Dierking 2013]
Ice-drift vectors derived from SAR imagery
Drift analysis: resolution pyramids linked in a cascade
Drift vectors from SAR image analysis (red) and
visual inspection (yellow)
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 54
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Sea Ice Take-Home Messages Ice detection (icebergs) Classification through multi-pol SAR Ice drift
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 55
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 56
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Universität Hamburg
Training Course on Radar & Optical RS, IES, Cēsis, Latvia, 5 - 9 September 2016
it‘s time for practicals…
Martin Gade - SAR Marine Applications - 3 – Currents & Objects 57