39342
Massachusetts Bay - Internal Wave Packets Extracted from SAR Imagery Binned in 1x1 minute grid cells
iw_binned1min
Data Set
Published / External
37201
SBNMS_Assess_Internal_Waves
Project
Completed
2006
This feature class contains internal wave packets extracted from SAR imagery that were binned in 1x1 minute latitude/longitude polygon grid cells. Statistics were calculated for each polygon grid cell---in particular, internal wave packet frequency, total internal wave packet area, average internal wave packet area, minimum internal wave packet area, maximum internal wave packet area, the variance of internal wave packet areas and the standard deviation of internal wave packet areas. These statistics were calculated so as to better understand the frequency, size and location of internal wave packets in Massachusetts Bay.
Created to support the biogeographic assessment of Stellwagen Bank National Marine Sanctuary.
633
Jackson, C.R. and J.R. Apel. 2004. Synthetic Aperture Radar Marine User's Manual. NOAA NESDIS: Washington, D.C. pp. 464. Available from: http://www.orbit.nesdis.noaa.gov/sod/mecb/sar/sarmanual.html
Theme
ISO 19115 Topic Category
imageryBaseMapsEarthCover
Theme
ISO 19115 Topic Category
oceans
Theme
NOS Data Explorer Topic Category
Environmental Monitoring
Theme
Internal Waves
Theme
SAR
Theme
Synthetic Aperture Radar
Temporal
1998-2003
Spatial
Gulf of Maine
Spatial
Massachusetts Bay
Spatial
Stellwagen Bank National Marine Sanctuary
National Centers for Coastal Ocean Science
Silver Spring
MD
Data Set
None Planned
vector digital data
These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials. NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA can not assume liability for and damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program:http://ccma.nos.noaa.gov/about/biogeography/
41302
InternalWave_Packets_Binned1minGrid
InternalWave_Packets_Binned1minGrid
Published / External
Completed
Internal wave packets binned in a 1x1minute polygon grid | Description Source: NOAA
Converted from FGDC using 'fgdc_to_inport_xml_entity.pl' script.
1
OBJECTID
Unknown
No
No
Active
Internal feature number. | Description Source: ESRI
Sequential unique whole numbers that are automatically generated.
2
Shape
Unknown
No
No
Active
Feature geometry. | Description Source: ESRI
Coordinates defining the features.
3
ET_ID
Unknown
No
No
Active
Unique polygon grid cell ID # | Description Source: NOAA
Unique integer defining each polygon grid cell
4
ET_Index
Unknown
No
No
Active
Second unique polygon grid cell ID # | Description Source: NOAA
Second unique set of coordinates defining each polygon grid cell
5
Count
VARCHAR
No
No
Active
Internal wave packet frequency | Description Source: NOAA
Frequency: Number of Internal wave packets per 1x1 minute polygon grid cell |
6
Sum_Area_sqkm
NUMBER
No
No
Active
Total internal wave packet area in grid cell | Description Source: NOAA
kilometers squared
0 - 1718.132
7
Avg_Area_sqkm
NUMBER
No
No
Active
Average internal wave packet area in grid cell | Description Source: NOAA
kilometers squared
0 - 373.3267
8
Min_Area_sqkm
NUMBER
No
No
Active
Minimum internal wave packet area in grid cell | Description Source: NOAA
kilometers squared
0 - 373.3267
9
Max_Area_sqkm
NUMBER
No
No
Active
Maximum internal wave packet area in grid cell | Description Source: NOAA
kilometers squared
0 - 373.3267
10
Var_Area_sqkm
NUMBER
No
No
Active
Variance of internal wave packet areas in grid cell | Description Source: NOAA
kilometers squared
0 - 31472.735
11
SD_Area_sqkm
NUMBER
No
No
Active
Standard deviation of internal wave packet areas in grid cell | Description Source: NOAA
kilometers squared
0 - 177.4056
Data Steward
2006
Position
NCCOS Scientific Data Coordinator
NCCOS.data@noaa.gov
Distributor
2006
Position
NCCOS Scientific Data Coordinator
NCCOS.data@noaa.gov
Metadata Contact
2006
Position
NCCOS Scientific Data Coordinator
NCCOS.data@noaa.gov
Point of Contact
2006
Position
NCCOS Scientific Data Coordinator
NCCOS.data@noaa.gov
Principal Investigator
2006
Person
Costa, Bryan
bryan.costa@noaa.gov
Ground Condition
-71.529044
-69.109407
42.987986
41.235121
Range
1998-05-14
2003-09-29
Yes
Yes
6814
Unclassified
Please contact the Stellwagen Banks NMS Research Coordinator for additional information on data access (david.wiley@noaa.gov);
None.
None. Acknowledgement of the National Oceanic and Atmospheric Administration, National Centers for Coastal Ocean Science, Center for Coastal Monitoring and Assessment, Biogeography Program would be appreciated in products derived from these data.
http://coastalscience.noaa.gov/projects/detail?key=141
Online Resource
2015-06-18
Date that the source FGDC record was last modified.
2017-04-05
Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.
2017-09-13
Partial upload of Spatial Info section only.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722
Unknown
Unknown
1
BACKGROUND:Synthetic Aperture Radar (SAR) can detect internal waves by emitting pulses of X-band (3cm), C-band (6cm) and L-band (24 cm) microwave energy, producing a two-dimensional radar backscatter map of the roughness of the ocean surface (Jackson and Apel, 2004 p.21, 41). In SAR imagery, internal waves appear as packets or groups of waves characterized by: 1) Alternating bands of bright and dark bands. The bright band is associated with the convergence zone, as determined by the orbital particle motion within the internal wave. 2) Curvilinear wave crests bent by refraction 3) Decreasing wave crest lengths from front to back of each packet 4) Decreasing wavelengths from front to back of each packet, indicating propagation direction and that nonlinear wave dispersion is in effect. 5) Decreasing wave amplitudes from front to back of each packet 6) Propagation parallel to significant isobaths Less often, internal waves may also be seen composed of only dark bands with no associated bright bands. This varying appearance is due to sensitivity to wind speed and wind direction, as well as to the orientation of the wave groups to the radar platform (Jackson and Apel, 2004 p.47). METHODS: In this study, the following methodology was used to identify and delineate internal wave packets in ESRI ArcGIS (ArcView) 9.1. First of all, a search extent was defined in order to narrow the geographic area in which to look for the internal waves. This area roughly covered from 42 deg 44 min 19 sec N to 41 deg 30 min 2 sec N and from 71 deg 8 min 3 sec W to 69 deg 36 min 30 sec W.. Each of the 66 SAR images (which were taken between May 14, 1997 and August 29, 2003) were examined for internal waves, using the internal wave packet characteristics listed above as an identification guide. A ESRI polygon shapefile was created with columns recording the SAR image tile name, its year, date and time, as well as the internal wave packet area, packet propagation direction and moon phase during which it occurred. All internal wave packets were digitized at a 1:350,000 scale and saved in this shapefile, along with the necessary attribute information. The internal wave packet data were analyzed using a non-parametric Kruskal-Wallis test for significant differences in the median with a Dunn's post hoc test.
2006-02-01T00:00:00
41302
Entity
InternalWave_Packets_Binned1minGrid
gov.noaa.nmfs.inport:39342
Tyler Christensen
2017-04-05T12:52:00
SysAdmin InPortAdmin
2023-05-30T18:09:18
2017-09-13
National Centers for Coastal Ocean Science
NCCOS
1002
Public
No
2017-09-13
1 Year
2018-09-13