Floating Ice. Susanne Lehner DLR EOC

Transcription

1 Floating Ice Susanne Lehner DLR EOC

2 DLR Research Lab Maritime Safety and Security in Bremen Team SAR Oceanography Relocated from Oberpfaffenhofen to Bremen Cooperation with NRT Services (Neustrelitz) and international Ground Stations ship detection iceberg detection oil spill detection wind and waves ice classification campaign support

3 DLR.de Chart 3 > Lecture > Author Document > Date Sekuliaq Cruise

4 Properties of Sea Ice from SAR Imagery Classification of Intensity Images Use of Texture Parameters Polarimetric Features Floe Size Distribution; Ice Drift, Meteo Parameters Ship Routeing NRT for Cruises: Lance Svalbard, Shokalsky Antarctica, Oden, Sikuliaq Arctic, Polarstern Iceberg Detection in NRT

5 Chart 5 Support campaigns in NRT Polarstern campaign in Antarctica Polarstern campaign in Antarctica Assist the Australian Maritime Safety Authority during the accident of the research vessel Akademik Shokalskiy Antarctica Lance campaign off the Svalbard coast, Arctic Ocean Oden cruise at the marginal ice zone Beaufort Sea, Arctic Ocean 08/15/ /16/ /20/ /05/ /30/ /09/ /14/ /29/ /17/2014 ongoing Norseman MIZ Recovery Cruise 09/24/ /03/2014 Sikuliaq Cruise, Point Barrow Ongoing October 2015

6 Support with Data by joint TS-X AO

7 Organise Aquisition DLR Collaborative Ground Station

8 Sea Ice Charting IICWG in Rostock 2015 Ice Analyst results Oderhaff and Baltic Charting BSH

9 Chart 9 Ice Type Classification Example Shokalsky Case TerraSAR-X image (ScanSAR) Aim: Classify the ice in near real time Main steps of the algorithm: 1. Select features 20 km 2. Feed the features into a neural network feature extraction feature a feature b feature c neural network fast ice First year thick ice First year ice open water with <1/10 ice of unspecified SoD open water unknown

10 DLR.de Chart 10 Improved Classification Result with polarimetric TS-X Data Ice classification Open Water First Year Ice Gray-white Ice Gray Ice Better Floe size Distribution Possible - Smaller Coverage though Features used: -copol power ratio, geometric intensity, -Scattering diversity, -span, -real part of copol cross product, -surface scattering fraction; -local variances of mentioned features Ressel et al, ESA, Pol-InSAR

11 DLR.de Chart 11 Floe size distribution Successive application of suitable filters and object detection to obtain a floe mask (exclude giant floes). Example: subsection of above image (Svalbard 2014/05/25, 14:33) 2014/05/25,TSX SM, σ HH + σ VV subsection Floe mask Workshop at SAMS, Oban

12 Operational Algorithms E Wind Field Ship, Wakes Land-Water-Line Sea State Bathymetry by Refraction Currents Oil Spills Breaking Waves Sea Ice, Icebergs

13 Wave Height at the Sea Ice Boundary Reasons for Ice Break Up, Ice Forming

14 WAVES PROPAGATION INTO THE SEA ICE The significant wave height reaches 18m during a storm south of Greenland. The waves are propagating into sea ice. With increasing distance to the ice edge the wave height decreases accompanied by an increase of wavelength.

15 Sea state at the Sea Ice Boundary Bering Strait Example of wave, wind and ice measurements from TerraSAR-x observations acquired over Bering Street on

16 DLR.de Folie 16 Globale AIS-Ship Density 2013 Anzahl der Schiffe (log) Projekt EMS, Courtesy S.Plass

17 DLR.de Chart 17 German Remote Sensing Data Center (DFD) of DLR DFD s specific emphasis and core competence is remote sensing DFD is operating an international Ground Station Network for the reception of satellite data

18 NRT Delivery to Polarstern fom Ground Station in Neustrelitz TerraSAR-X NRT StripMap Dual Pol MGD (HH and VV) Image over Weddell Sea on 23 th September 2013 at 06:21 UTC and RV POLARSTERN on full resolution image extract. RGB Channel Distribution: R: HH G: VV B: HH-VV Wedell Sea Antarctica

19 Chart 19 Anja Frost Iceberg Detection Iceberg mapping by recon flights of the International Ice Patrol (IIP) Latest synchronised images: Sa, 14th June 2014, 08:30 UTC, TSX Stripmap So, 15th June 2014, 21:00 UTC, TSX ScanSAR Tu, 17th June 2014, 09:44 UTC, TSX Stripmap Th, 26th June 2014, 21:00 UTC, TSX ScanSAR Sa, 28th June 2014, 09:44 UTC, TSX StripMap In case of poor visibility, bad weather or apparatus failure: Use of SAR data For validation of our NRT iceberg detection: Synchronisation of IIP recon flights and TSX image acquisition 81 m 195 m 169 m NRT iceberg detection 23 rd May 2014, 21:18 UTC, TSX Stripmap image

20 Section of a TerraSAR-X Stripmap image Disko Bay 23rd April 2013 comparison with detections of airborne International Ice Patrol (IIP) ongoing 1 km

21 Chart 21 Ice classification for field campaigns TSX acquisitions during Lance campaign off the Svalbard coast Course plot: Sample classification based on in-situ observations during cruise, , 15:08 Ice classification Open Water, Nilas Level Ice Medium deformed Ice Compressed/Highly deformed Ice, Ridges

22 Chart 22 Lance IRO campaign 20 km TSX acquisitions during Lance campaign off the Svalbard coast :09 UTC EM Bird RV Lance (course: W) Ressel et al, IEEE, TGARS TS-X Scan SAR

23 Chart 23 Susanne Lehner 22nd September 2014 Support campaigns Oden cruise at the marginal ice zone in Beaufort Sea

24 Summary Polarimetric NRT Larger Validation with Ice maps and Campaign Data Optimize use of NN and input Feature Parameters Do automatic Floe Size Distribution Improve operational Performance Iceberg Detection Interferometric Measurements Extend to Sentinel-1, HH,HV Soon NRT Products operational for DLR Polar Stations Coordination of Stations advisable NRT for Science gives usable operational algorithms

25 DLR.de Chart 25 > Lecture > Author Document > Date DLR MF Forschungsstelle Bremen Picture A. Frost

26 Eisberge auf den Hauptschifffahrtsrouten Eisberg Drift

27 4. 5.

28 Preliminary comparison of modeled ice thickness TerraSAR-X ScanSAR, resolution of ~16m 2km preliminary results (climatologic boundary conditions) Crack widths in order of <1km 00: thickness Barents Sea

29 ONR Project Sea State DRI Breakup Sea Ice Greenland Cooperation with UVIC and ECMWF

30 DLR.de Chart 30 > Lecture > Author Document > Date MIZ recovery cruise (Norseman, Sep/Oct 2014) Sep, 26, 2014,16:58, TSX Stripmap VV

31 DLR.de Folie 31 Forschung und Schifffahrt in der Antarktis TerraSAR-X ScanSAR Akademik Shokalskiy 10 Tage festgesessen im Packeis Wind Xue Long Akademik Shokalskiy Festeis Packeis Eisgrenze 10 km Offenes Wasser TerraSAR-X Daten halfen dem australischen Rettungszentrum, die Eissituation besser zu beobachten Ein Algorithmus zur automatische Eiskartenerstellung in naher Echtzeit wurde entwickelt und präsentiert