FTLE_5MHz_24h eng UTF8 dataset service John Kerfoot Rutgers University DMCS 848-932-3344 71 Dudley Road New Brunswick NJ 08901 USA kerfoot@marine.rutgers.edu pointOfContact 2026-04-27 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) 3 column 270 0.03324751162617623 row 300 0.03319384979962505 temporal 3683 86400.0 area FTLE based on 5MHz HF Radar Network with 24-hour Integration Time 2026-04-27 creation hfr.marine.rutgers.edu FTLE_5MHz_24h Laura Nazzaro Rutgers University nazzaro at marine.rutgers.edu rucool.marine.rutgers.edu information web browser Background Information Background information from the source information originator Jacqueline Veatch, Josh Kohut, Erick Fredj, Delphine Mossman, Hugh Roarty, Laura Nazzaro, Michael Smith, Tim Stolarz contributor FTLE (Finite Time Lyapunov Exponent ) calculations begin with virtual particles released in a flow field. An FTLE ridge is then defined as an area where these particles are converged to and then diverged along. A scalar quantity is assigned to the FTLE ridge based on the integrated rate of attraction of the particles. These calculations were performed using a MATLAB toolbox modified to be applied to High Frequency Radar (HFR) and coastal flow. These modifications included (1) removal of the requisite for 'closed' structures, allowing the toolbox to identify 'filament' structures alone that are characteristic of coastal flow (2) assigning all NaN values to 24 hour periods with HFR coverage below 40% of the decade mean HFR coverage (3) aborting calculations when boundary conditions are not satisfactory (approaching +/- infinity) because the data being computed with is isolated (a small 'pond' of data) or advected particles are leaving the study region too quickly and (4) removing the 'edges' of the data where advected particles are influenced by the discontinuation of the data in an irregular shape. Laura Nazzaro Rutgers University nazzaro at marine.rutgers.edu rucool.marine.rutgers.edu information web browser Background Information Background information from the source information pointOfContact 24-hour 5mhz based data exponent finite frequency ftle HF hf radar hfr hfradar high hour integration lyapunov network radar rutgers university with theme Rutgers University project time latitude longitude theme CF Standard Name Table v70 The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information. Rutgers University largerWorkCitation project Unidata Common Data Model Grid largerWorkCitation project eng geoscientificInformation 1 -76.97678 -68.0332 33.54882 43.47378 seconds 2012-12-01T00:00:00Z 2022-12-31T00:00:00Z FTLE based on 5MHz HF Radar Network with 24-hour Integration Time 2026-04-27 creation Laura Nazzaro Rutgers University nazzaro at marine.rutgers.edu rucool.marine.rutgers.edu information web browser Background Information Background information from the source information originator Jacqueline Veatch, Josh Kohut, Erick Fredj, Delphine Mossman, Hugh Roarty, Laura Nazzaro, Michael Smith, Tim Stolarz contributor FTLE (Finite Time Lyapunov Exponent ) calculations begin with virtual particles released in a flow field. An FTLE ridge is then defined as an area where these particles are converged to and then diverged along. A scalar quantity is assigned to the FTLE ridge based on the integrated rate of attraction of the particles. These calculations were performed using a MATLAB toolbox modified to be applied to High Frequency Radar (HFR) and coastal flow. These modifications included (1) removal of the requisite for 'closed' structures, allowing the toolbox to identify 'filament' structures alone that are characteristic of coastal flow (2) assigning all NaN values to 24 hour periods with HFR coverage below 40% of the decade mean HFR coverage (3) aborting calculations when boundary conditions are not satisfactory (approaching +/- infinity) because the data being computed with is isolated (a small 'pond' of data) or advected particles are leaving the study region too quickly and (4) removing the 'edges' of the data where advected particles are influenced by the discontinuation of the data in an irregular shape. ERDDAP griddap 1 -76.97678 -68.0332 33.54882 43.47378 seconds 2012-12-01T00:00:00Z 2022-12-31T00:00:00Z tight ERDDAPgriddapDatasetQueryAndAccess https://hfr.marine.rutgers.edu/erddap/griddap/FTLE_5MHz_24h ERDDAP:griddap ERDDAP-griddap ERDDAP's griddap service (a flavor of OPeNDAP) for gridded data. Add different extensions (e.g., .html, .graph, .das, .dds) to the base URL for different purposes. download FTLE based on 5MHz HF Radar Network with 24-hour Integration Time 2026-04-27 creation Laura Nazzaro Rutgers University nazzaro at marine.rutgers.edu rucool.marine.rutgers.edu information web browser Background Information Background information from the source information originator Jacqueline Veatch, Josh Kohut, Erick Fredj, Delphine Mossman, Hugh Roarty, Laura Nazzaro, Michael Smith, Tim Stolarz contributor FTLE (Finite Time Lyapunov Exponent ) calculations begin with virtual particles released in a flow field. An FTLE ridge is then defined as an area where these particles are converged to and then diverged along. A scalar quantity is assigned to the FTLE ridge based on the integrated rate of attraction of the particles. These calculations were performed using a MATLAB toolbox modified to be applied to High Frequency Radar (HFR) and coastal flow. These modifications included (1) removal of the requisite for 'closed' structures, allowing the toolbox to identify 'filament' structures alone that are characteristic of coastal flow (2) assigning all NaN values to 24 hour periods with HFR coverage below 40% of the decade mean HFR coverage (3) aborting calculations when boundary conditions are not satisfactory (approaching +/- infinity) because the data being computed with is isolated (a small 'pond' of data) or advected particles are leaving the study region too quickly and (4) removing the 'edges' of the data where advected particles are influenced by the discontinuation of the data in an irregular shape. OPeNDAP 1 -76.97678 -68.0332 33.54882 43.47378 seconds 2012-12-01T00:00:00Z 2022-12-31T00:00:00Z tight OPeNDAPDatasetQueryAndAccess https://hfr.marine.rutgers.edu/erddap/griddap/FTLE_5MHz_24h OPeNDAP:OPeNDAP OPeNDAP An OPeNDAP service for gridded data. Add different extensions (e.g., .html, .das, .dds) to the base URL for different purposes. download physicalMeasurement ftle double Finite Time Lyapunov Exponent John Kerfoot Rutgers University DMCS 848-932-3344 71 Dudley Road New Brunswick NJ 08901 USA kerfoot@marine.rutgers.edu distributor OPeNDAP DAP/2.0 https://hfr.marine.rutgers.edu/erddap/griddap/FTLE_5MHz_24h.html order Data Subset Form ERDDAP's version of the OPeNDAP .html web page for this dataset. Specify a subset of the dataset and download the data via OPeNDAP or in many different file types. download https://hfr.marine.rutgers.edu/erddap/griddap/FTLE_5MHz_24h.graph order Make-A-Graph Form ERDDAP's Make-A-Graph .html web page for this dataset. Create an image with a map or graph of a subset of the data. mapDigital This record was created from dataset metadata by ERDDAP Version 2.30.0