ARGOMARINE Final Conference - NTUA Presentation - Vassilia Karathanassi, Pol Kolokoussis
SST-234096 New strategies and technologies for thesafety of navigation in the Mediterranean sea Remote Sensing Surveillance Technologies Vassilia Karathanassi, Pol Kolokoussis email@example.com, firstname.lastname@example.org Laboratory of Remote Sensing National Technical University of Athens 21 November 2012 Centro Culturale De Laugier, Portoferraio, Isola d’Elba (ITALY)
Spectroscopy Laboratory measurements Is it possible to detect the oil type? Yes. Reﬂectance is rising from light to heavy oils. RWATER < RKEROSENE < RHEATING OIL < RCRUDE OIL < RHEAVY FUEL < RMARINE FUEL OIL. Ratios between R of each oil type and R of sea water (344.51 nm) OIL TYPE RATIOS DAYS KEROSENE 1.53-1.54 1,2 HEATING OIL 1.64-1.76 1,2 Laboratory experiments CRUDE OIL 1.86-1.89 1,2,3 included 13 oil types SRFO 2.08-2.09 1,2,3 BUNKER 3 2.30-2.51 1,2 Isola dElba 21/11/2012
Spectroscopy Laboratory measurements Is it possible to detect the thickness of the oil? Yes. The thicker the oil spill, the higher its reﬂectance. Best-ﬁt functions for each oil type 8 different thicknesses ranging from 1μm to 2mm Isola dElba 21/11/2012
Spectroscopy From laboratory to in situ measurements Does the oil spill present the same spectral signature in the marine environment? No. Thin oil-spills and sea water present sea bottom contributions. Denser oils like the Arabian present minor sea bottom contributions even for thin layers of oil-spills (150μm).Example of spectral signatures of blend oil-spill WE NEED AN EXTENDED OILin marine environment SPECTRAL LIBRARY IN MARINE ENVIRONMENT Isola dElba 21/11/2012
Hyperspectral Remote sensingHyperspectra l Sensor In hyperspectral imagery each pixel contains a unique, continuous spectrum which is used for the identiﬁcation of materials by their reﬂectance. Isola dElba 21/11/2012
Airborne Hyperspectral images CASI-550 airborne hyperspectral imagery has been acquired for the ARGOMARINE project Isola dElba 21/11/2012
Hyperspectral Remote sensing Oil spill detection Can we detect oil spills by processing a hyperspectral image? - Yes. Even very thin oil-spills can be detected. The only constraint is the presence of clouds. They should be excluded from the image. Do airborne and in situ spectral measurements coincide?Results of the hyperspectral oil-spill - Almost Yes. detection methodology for the Laganasbay, Zakynthos.The small and very thin oil spill was causedby a natural oil outﬂow. Isola dElba 21/11/2012
Hyperspectral Remote sensing Methodology for oil spill detection Pre-processing of the hyperspectral Can we detect the type of image (radiometric, atmospheric correction and georeference) an oil spill by processing a Signal subspace estimation (The Intra-StD method has been hyperspectral imagery? developed within ARGOMARINE) Yes. If there is an extended Dimensionality Spectral Library for the reduction marine environment under real biophysical conditions. Endmember extraction (The Improved-SEE method has been developed within ARGOMARINE)SAM classiﬁcation or Abundance fraction algorithm for thickness estimation (The NBM method has been developed within ARGOMARINE) Isola dElba 21/11/2012
Hyperspectral Remote sensing Oil spill thickness estimation Can we estimate the thickness of an oil spill by processing a hyperspectral imagery? Yes. Relative thickness for the oil- spill can be estimated. This could lead to absolute thickness estimation in case that in situ measurements in the area with the greatest oil concentration is performed. Can we avoid in situMap of oil-spill relative measurements? thickness Yes. If there is an extended Spectral Library for the marine environment Isola dElba 21/11/2012 biophysical conditions. under real
Hyperspectral Remote Sensing How to build an extended Spectral Library for the marine environment The Integrated ARGOMARINE methodology Is it tested? Only on MODIS and ASTER imagery with Satisfactory results. A next research program is needed. Isola dElba 21/11/2012
Multispectral Remote sensing for oil spill detection Can we detect an oil spill by processing a very high spatial resolution multispectral imagery? Yes. Can we detect the oil spill type? No. Can we detect the oil spill thickness? Object based oil-spill detection on an No. IKONOS image of Beirut, Lebanon (August 5th 2006) Is the methodology also applicable on high resolution multispectral images (i.e. Landsat TM)? Yes (providing average to good Isola dElba 21/11/2012 detection results).
Multispectral Remote sensing Methodology for oil spill detection Multispectral image geocoding. Application of ATCOR3 atmospheric corrections and conversion of the raw image digital numbers to surface reﬂectance values. Masking of the non-sea areas, i.e. land and clouds. Image multiresolution segmentation in two levels (ﬁne and broad). Oil-spill detection using object based classiﬁcation rules Isola dElba 21/11/2012
Remote Sensing potentials for Natural oil outﬂow detectionCan we detect an unknown oilnatural outﬂow using remotesensing imagery? Yes. Within the ARGOMARINEproject by processing very highresolution (RapidEye) as well ashistorical high resolution(Landsat TM) multispectralimagery, a large unknownsystematic natural oil outﬂownear the island of Zakynthos hasbeen discovered. The oil-spill Multitemporal color composite of three RapidEyeoccurrence seems to be images of Zakynthos: July 13th 2009 (Blue), Julysystematic over a long period of 15th 2009 (Green), and July 16th 2011 (Red).time (it appears on many Landsat The unusual oil-spill occurrences near Zakynthos start from a speciﬁc point at the openimages from 1986 till 2012) and sea, 6 km south of the area of Keri.was veriﬁed by spot test from aNMPZ boat. Isola dElba 21/11/2012
Thank you for your attention Isola dElba 21/11/2012
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