the application of aperture radar (sar) to · the application of synthetic aperture radar (sar) to...
TRANSCRIPT
-
10/27/2015
1
The Application of Synthetic Aperture Radar (SAR) to
Natural Resource Damage Assessment
George GraettingerNOAA’s Ocean Service, Office of Response & Restoration
Oil Observing Tools Training & WorkshopDisaster Response Center, Mobile, AL
October 21st, 2015
Overview: NRDA and SAR
• OR&R and NRDA• SAR and TCNNA Processing• SAR Products
– Cumulative Composite– Cumulative Days of Oiling– Shoreline Days of Oiling– Time of Oiling
• Summary/Conclusions
-
10/27/2015
2
OR&R & NRDA
Response
Response(24 hours)
Recovery or Restoration
(Years/Decades)
Assessment Restoration
Continuum of “Response” Framework for The Office of Response & Restoration
NRDA Requires Demonstration of Causality: Oil causing injury
Source
Pathway
Exposure
Injury
-
10/27/2015
3
NRDA Requires Demonstration of Causality: Oil causing injury
Source
Pathway
Exposure
Injury
NRDA Exposure from SAR
• Surface/Shoreline Oiling Extent– SAR data have been used for surface oil extent mapping for many years
– Surface oiling extent supports injury determination for multiple natural resources(Larval life stages, mammals, sargassum, turtles, etc.)
– SAR oiling features can add value to traditional assessment techniques and modeling (Operational search area, Trajectory model initialization, SCAT, pre/post oiling screening)
-
10/27/2015
4
NOAA NESDIS Experimental MPSR –Anomaly Footprint
NESDIS created footprints for almost everyday of the response:186 individual imagesRepresenting 89 days
SAR Oiling Extent Analysis
• SAR Anomaly Classification Methods – NESDIS SAR analysis (analyst specific, manual)– TCNNA algorithm (semi‐automated)
• TCNNA (texture classifying neural network algorithm) developed jointly between NESDIS and FSU
• Methodology published in 2009
-
10/27/2015
5
SAR TCNNA Oiling Footprint
• Semi‐automated process• Detailed examination of
environmental conditions• Use data to map low wind
features, false positives• Help eliminate subjectivity
of individual analyst• Expedite delivery• Oil not anomaly
SAR TCNNA Products
• SAR TCNNA Sensor Products– Daily Composites– Cumulative Composite– Cumulative Days of Oiling– Shoreline Days of Oiling– Time of Oiling
-
10/27/2015
6
SAR TCNNA Products:Daily Composite/Cumulative Composite
89 Daily composite oiling footprints createdfrom multiple images a day (186 total images)
SAR TCNNA Products:Cumulative SAR TCNNA Footprint
Cumulative composite oiling footprint createdfrom all 89 days (total exposure area)
-
10/27/2015
7
SAR TCNNA Products:Cumulative Days of Oiling
Overall Oiling coverage and potential exposureacross entire spill event (exposure persistence)
SAR TCNNA Shoreline Analysis Products:Days of Shoreline Oiling
SCAT assessment represents oiling condition for the survey date only
Unanswered Question: When and how long did this condition persist
-
10/27/2015
8
SAR TCNNA Shoreline Analysis Products:Days of Shoreline Oiling
Shoreline analysis is built off of the SCAT shoreline
SAR TCNNA Shoreline Analysis Products:Days of Shoreline Oiling
SCAT shoreline is buffered 3 km
-
10/27/2015
9
SAR TCNNA Shoreline Analysis Products:Days of Shoreline Oiling
Shoreline buffer intersected by daily footprints
SAR TCNNA Shoreline Analysis Products:Days of Shoreline Oiling
Shoreline buffer intersections tallied for days of oiling
-
10/27/2015
10
SAR TCNNA Shoreline Analysis Products:Days of Shoreline Oiling
Days of Shoreline Oiling helps define initial near shore exposure dates; characterizes duration and persistence for exposed shorelines
SAR TCNNA SAR Analysis Products:Time of Oiling
Open water sampling helps characterize chemical concentrations
Unanswered Question: do samples represent pre or post incident oiling ?
-
10/27/2015
11
SAR TCNNA SAR Analysis Products:Time of Oiling
Select shoreline grids for every TCNNA Daily CompositeCalculate grid initial oiling date for every day of intersection
SAR TCNNA SAR Analysis Products:Time of Oiling
Time of Oiling shoreline grid allows for rapid filtering of data for pre/post oiling condition
-
10/27/2015
12
SAR use in NRDA
• SAR data add value as an effective screening tool
• Data provide tools for focusing and filtering on a particular resource
• Allows us to prioritize assessment efforts to habitats and species assemblages at the greatest risk of exposure
SAR and NRDA
• Open water and shoreline conditions are informed by SAR analysis
• SAR data allow us to look at overall extent and duration of potential exposure
• Satellite analysis supplements in situ observations and sampling
• SAR data are a useful as an indication of exposure, but not injury
-
10/27/2015
13
SAR and Damage Assessment
SAR Data Summary: • SAR data provide a useful exposure surface area for a variety of Trust resources
• SAR data can provide temporal context to SCAT assessment and environmental sampling
• SAR data add value to traditional response and assessment investigations
• Current and emerging application of SAR data will provide significant support to the NRDA process in future incidents
Thank‐you!
Questions?