Abstract:
We present a new bathymetric compilation around Ascension Island here defined by the following bounding box: 14.57 to 14.17 W, 8.12 to 7.75 S.
This bathymetry grid was compiled from a variety of multibeam swath bathymetry data acquired during 4 different cruises (see lineage). The data is available as a grid of approximately 50 m resolution in two different formats: a GMT-compatible (2-D) NetCDF and Arc/Info and ArcView ASCII grid format using geographic coordinates on the WGS84 datum.
Funding was provided by NERC grants NE/J023051/1 and NE/J020303/1
Keywords:
Ascension Island, Bathymetry, Multibeam
Fremand, A., & Barnes, D. (2019). A bathymetric compilation of Ascension Island, 2000-2017 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/afba710f-dab1-4a63-867b-520177388224
| Access Constraints: | None |
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| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions: 1. To cite the data Fremand, A.C. (2019) and Barnes, D. A bathymetric compilation of Ascension Island, 2000-2017. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. 2. The user recognizes the limitations of data and will not use this data for navigation purposes. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data. |
| Creation Date: | 2019-09-12 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | PDC BAS |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Ms Alice C Fremand |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | David Barnes |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Quality: | Quality control was undertaken manually to remove any outliers in the source datasets. This involved cleaning much of the raw data using the "mbedit" command from MB-system. | |
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| Lineage: | The multibeam swath bathymetry data were collected on scientific cruises undertaken by British Antarctic Survey (BAS) on RRS James Clark Ross: JR53-AMT11, JR287, JR15001 and JR16-NG. The grid was created using the mbgrid program from MB-system version 5.5.2336 , using the parameters " -E0.0005/0.0005/degrees! -G4 -A2 -F1 -R-14.57/-14.17/-8.12/-7.75" for Arc/Info and ArcView ASCII grid and " -E0.0005/0.0005/degrees! -G3 -A2 -F1 -R-14.57/-14.17/-8.12/-7.75" for the netCDF file. This uses a Gaussian weighted mean filter and the bathymetry is gridded as topography (positive upwards) |
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| Temporal Coverage: | |
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| Start Date | 2000-01-01 |
| End Date | 2017-12-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -8.12 |
| Northernmost | -7.75 |
| Longitude | |
| Westernmost | -14.57 |
| Easternmost | -14.17 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | -39 |
| Max Depth | -3508 |
| Data Resolution: | |
| Latitude Resolution | 0.0005 degrees |
| Longitude Resolution | 0.0005 degrees |
| Horizontal Resolution Range | 30 meters - < 100 meters |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | St Helena |
| Detailed Location | Ascension Island |
| Sensor(s): |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 6.1 MB |
| Distribution Format | ASCII |
| Fees | N/A |
| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 2.3 MB |
| Distribution Format | netCDF |
| Fees | N/A |