• Metadata catalogue
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Grid extracted from GMRT Map Tool for the BlackSea region

Ryan, W.B.F., S.M. Carbotte, J.O. Coplan, S. O'Hara, A. Melkonian, R. Arko, R.A. Weissel, V. Ferrini, A. Goodwillie, F. Nitsche, J. Bonczkowski, and R. Zemsky (2009), Global Multi-Resolution Topography synthesis, Geochem. Geophys. Geosyst., 10, Q03014, doi: 10.1029/2008GC002332

Extraction of the GMRT grid for the Black Sea region of EMODnet bathymetry.

GMRT overview from https://www.gmrt.org/about/index.php

The Global Multi-Resolution Topography (GMRT) Synthesis is a multi-resolution Digital Elevation Model (DEM) maintained in three projections and managed with a scalable global architecture that offers infrastructure for accessing the DEM as grids, images, points and profiles. A mask layer is available that highlights the location of high-resolution data. Most curatorial effort for GMRT is focused on cleaning and processing ship-based multibeam sonar data acquired by the US Academic Research Fleet (ARF) so they can be gridded at their full spatial resolution (~100m in the deep sea). These data are seamlessly overlain on lower resolution observed and predicted bathymetry data and are integrated with terrestrial elevation data to deliver to users the best resolution data that have been curated for a particular area area of interest.

 
Citation proposal
Lamont-Doherty Earth Observatory, Columbia University. Grid extracted from GMRT Map Tool for the BlackSea region. https://services.mspdata.eu:/geonetwork/srv/api/records/SDN_CPRD_1384_GMRT2024_BlackSea

Simple

Alternate title
Date ( Creation )
2024-06-05
Date ( Revision )
Identifier
GMRT2024_BlackSea

  Originator

Lamont-Doherty Earth Observatory, Columbia University  

P.O. Box 1000

61 Route 9W

Palisades 10964-1000 United States

  +1 (845) 359-2900  
  +1 (845) 359-2931 
Website
web site  

  Custodian

Lamont-Doherty Earth Observatory, Columbia University  

P.O. Box 1000

61 Route 9W

Palisades 10964-1000 United States

  +1 (845) 359-2900  
  +1 (845) 359-2931 
Website
web site  
Project name ( Theme )
SeaDataNet device categories ( Theme )
  • multi-beam echosounders , single-beam echosounders
http://vocab.ndg.nerc.ac.uk/ ( Stratum )
Parameter Discovery Vocabulary (P02) ( parameter )
  • Bathymetry and Elevation
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Hydrography
SeaDataNet depth measurement reference planes ( Theme )
  • sea level
Use limitation
Access constraints
unrestricted
Use constraints
academic
Other constraints

Citation

Ryan, W.B.F., S.M. Carbotte, J.O. Coplan, S. O'Hara, A. Melkonian, R. Arko, R.A. Weissel, V. Ferrini, A. Goodwillie, F. Nitsche, J. Bonczkowski, and R. Zemsky (2009), Global Multi-Resolution Topography synthesis, Geochem. Geophys. Geosyst., 10, Q03014, doi: 10.1029/2008GC002332

Use limitation
Spatial representation type
Grid
Denominator
50000
Distance
3.75  Arc second
Metadata language
English
Character set
UTF8
Topic category
  • Oceans
N
S
E
W


Unique resource identifier
Description

Map projection parameters, values and units :

Axes units :

Unique resource identifier
Codespace
EPSG
Version
7.4
Reference system identifier
EPSG / WGS 84 (EPSG:4326) / 7.4
Number of dimensions
3
Dimension name
Column
Dimension size
976
Dimension name
Row
Dimension size
504
Dimension name
Time
Dimension size
1
Cell geometry
Point
Transformation parameter availability
false
Checkpoint Availability
false
Point in Pixel
Distribution format
  • NetCDF ( )

    Specification

  Distributor

EDMO name  

  Distributor

Maurice Lamontagne Institute  
850, route de la Mer, Sainte-Flavie Mont-Joli G5H 3Z4 Canada

  4187750500  
  4187750730 
Website
web site  
Protocol
WWW:LINK
Name
Description
Function
Information
OnLine resource
EMODnet Bathymetry WMTS service  
Hierarchy level
Dataset

Vertical extent

Minimum value
205
Maximum value
1960

Vertical CS

Vertical datum

Statement
no information
Hierarchy level
Feature
Dataset
accuracy

Gridded data positional accuracy

Name of measure
horizontal accuracy
Measure identification
horizontal accuracy of coordinate
Measure description
Evaluation method description

Quantitative result

Value type
horizontal accuracy

Quantitative attribute accuracy

Name of measure
depth
Measure identification
depth accuracy
Measure description
Evaluation method description

Quantitative result

Value
not defined

Conformance result

Date
Explanation
Hierarchy level
Software
Description
Other
software
Hierarchy level
Property type
Description
parameters of data processing
Attributes
  •   Sea-floor depth (below Lowest Astronomical Tide datum) {bathymetric depth} in the water body
Statement

Description of data processing :

https://www.gmrt.org/about/index.php

How are swath data processed?

We use a combination of software developed in-house and open source software to process swath data for GMRT. MB-System provides the backbone of the code that we use for our data cleaning and processing. Raw multibeam sonar ping files available for each cruise are first run through a series of crude filters (e.g. ocean depth), and are then used to generate a development set of 100-m resolution tiled images and grids. These images and grids are reviewed and quantitatively interrogated using a custom version of GeoMapApp. This allows our team to assess data coverage and data quality, and to identify problems in the data that can be addressed using multibeam processing tools and techniques available through MB-System.

Data are typically processed to 100-m resolution. While our overall goal is to include only high-quality data, we sometimes include lower quality data in areas where data coverage is sparse (e.g. Southern Ocean). The data are reviewed, edited as necessary and re-gridded iteratively until the quality is suitable for inclusion in the tile set. During this process, we also determine the maximum data resolution for the cruise, the data are either gridded at 100m (default), 50m, and 25m resolution depending on sonar system capabilities and survey area. The chosen resolution is applied to the entire cruise and is therefore limited by maximum water depth. During QA/QC we also assign a quality value to the cruise on the range of 1-10 with 10 being applied to the highest quality cruises. This value is applied to the data and affects the degree of blending that happens when the data are merged into the compilation.

After extraction from the GMRT website, the grid is converted in the specified format of the EMODnet Bathymetry project before integration.

Description

Multisources bathymetry

Data sources for GMRT grid is described in https://www.gmrt.org/contributors/index.php

Hierarchy level
Dataset

Absolute external positional accuracy

Name of measure
emodnet-bathymetry.QI.Horizontal
Value
1 - Between 500m and 50m

Absolute external positional accuracy

Name of measure
emodnet-bathymetry.QI.Vertical
Value
2 - MBES low frequency (lower than 100kHz) (similar than 1+2%d)

Domain consistency

Name of measure
emodnet-bathymetry.QI.Purpose
Value
0 - Undefined

Metadata

File identifier
SDN_CPRD_1384_GMRT2024_BlackSea   XML
Metadata language
English
Character set
UTF8
Hierarchy level name
Product record
Date stamp
2024-06-05T14:04:03.254Z
Metadata standard name
ISO 19115:2003/19139 - EMODNET - BATHYMETRY
Metadata standard version
1.0

  Author

Ifremer, Marine Geosciences  

IFREMER Centre de Bretagne

ZI Pointe du diable

CS 10070

PLOUZANE 29280 France

Name
web site
Function
Information
 
 

  Overviews


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