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Dataset Title:	Northeast Atlantic Ocean, Loire River, DIVAnd 4D seasonal analysis of Water body dissolved oxygen concentration 1950/2024 v2025 [observations]
Institution:	IFREMER, SISMER, Scientific Information Systems for the SEA (Dataset ID: oceanbrowser_opendap_9690_5f9b_392a)
Information:	Summary \| License \| Metadata \| Background \| Data Access Form

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Things You Can Do With Your Graphs

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  observations {
    Int32 actual_range 0, 25120;
    String long_name "Observations";
    String units "count";
  }
  obsdepth {
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String long_name "depth of the observations";
    String positive "down";
    String standard_name "depth";
    String units "meters";
  }
  obslat {
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String long_name "latitude of the observations";
    String standard_name "latitude";
    String units "degrees_north";
  }
  obslon {
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String long_name "longitude of the observations";
    String standard_name "longitude";
    String units "degrees_east";
  }
  obstime {
    String ioos_category "Time";
    String long_name "time of the observations";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  NC_GLOBAL {
    String abstract 
"Seasonal climatology of Water body dissolved oxygen concentration for Loire river for the period 1950-2024 and for the following seasons:
 - winter: January-March,
 - spring: April-June,
 - summer: July-September,
 - autumn: October-December. 
Observation data span from 1950 to 2024. 
Depth levels (m): [0.0, 2.0, 4.0, 6.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0, 40.0, 45.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 110.0, 120.0, 130.0]. 
Data sources: observational data from SeaDataNet/EMODNet Chemistry Data Network. 
Description of DIVAnd analysis: the computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.12, using GEBCO 15 sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps is 0.01 degrees. Horizontal correlation length is defined seasonally (in meters): 150000 (winter), 100000 (spring), 70000 (summer), 115000 (autumn). Vertical correlation length was optimized and vertically filtered and a seasonally-averaged profile was used (DIVAnd.fitvertlen). Signal-to-noise ratio was fixed to 1 for vertical profiles and 0.1 for time series to account for the redundancy in the time series observations. A logarithmic transformation (DIVAnd.loglin) was applied to the data prior to the analysis. Background field: the vertically-filtered data mean profile is substracted from the data. Detrending of data: no, advection constraint applied: no. 
Units: umol/l.";
    String Acknowledgements "Aggregated data products are generated by EMODnet Chemistry under the support of DG MARE Call for Tenders EASME/2020/OP/0006 (EASME/EMFF/2020/3.1.11/Lot 5/SI2.846161).";
    String area_keywords "Northeast Atlantic Ocean (40W)";
    String area_keywords_urn "SDN:C19::SVX00015";
    String Author_email "GaÃ«lle HERBERT <gaelle.herbert@ifremer.fr> Julie GATTI <julie.gatti@ifremer.fr>";
    String bathymetry_source "resolution: 0.01Â°, based on the global GEBCO Digital Atlas, 15 sec, 2019";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_name "IFREMER, SISMER, Scientific Information Systems for the SEA";
    String creator_type "institution";
    String creator_url "https://wwz.ifremer.fr/";
    String date "2025-10-16T18:14:56.535";
    String DIVAnd_code_doi "10.5281/zenodo.7016823";
    String DIVAnd_references "Barth, A.; Beckers, J.-M.; Troupin, C.; Alvera-Azcarate, A & Vandenbulcke, L. divand-1.0: n-dimensional variational data analysis for ocean observations. Geoscientific Model Development, 2014, 7, 225-241. DOI: 10.5194/gmd-7-225-2014";
    String DIVAnd_source "https://github.com/gher-uliege/DIVAnd.jl";
    String DIVAnd_version "v2.7.12";
    String doi "https://doi.org/10.13120/30439d84-f765-4feb-9316-a0d09914c563";
    String file_name "Water_body_dissolved_oxygen_concentration.nc";
    String history 
"Thu Nov  6 15:59:47 2025: ncks -7 -O -L 5 --baa=4 --ppc default=3 /media/ctroupin/T7 Shield/data/EMODnet-Chemistry/Eutrophication2024/Results/Coastal_areas-water_body/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_oxygen_concentration.nc /media/ctroupin/T7 Shield/data/EMODnet-Chemistry/Eutrophication2024/Results/Coastal_areas-water_body/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_oxygen_concentration.nc
2026-03-14T00:01:28Z http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2025/Coastal_areas-water_body/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_oxygen_concentration.nc
2026-03-14T00:01:28Z https://erddap.emodnet.eu/griddap/oceanbrowser_opendap_9690_5f9b_392a.das";
    String id "DatasetScan/emodnet-projects/v2025/Coastal_areas-water_body/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_oxygen_concentration.nc";
    String infoUrl "http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2025/Coastal_areas-water_body/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_oxygen_concentration.nc.html";
    String institution "IFREMER, SISMER, Scientific Information Systems for the SEA";
    String institution_urn "SDN:EDMO::486";
    String keywords "analysis, atlantic, body, concentration, data, depth, dissolved, divand, exploitation, francais, ifremer, information, institut, latitude, loire, longitude, mer, northeast, O2, obsdepth, observations, obslat, obslon, obstime, ocean, oxygen, pour, recherche, river, scientific, sea, seasonal, seawater, sismer, systems, time, v2025, water";
    String license 
"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.";
    String NCO "netCDF Operators version 5.2.1 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco, Citation = 10.1016/j.envsoft.2008.03.004)";
    String parameter_keyword "Water body dissolved oxygen concentration";
    String parameter_keyword_urn "SDN:P35::EPC00002";
    String product_code "Loire-Water_body_dissolved_oxygen_concentration-v2025-ANA";
    String product_id "30439d84-f765-4feb-9316-a0d09914c563";
    String product_version "1";
    String project "EMODNET Chemistry â€" Phase 5";
    String search_keywords "Dissolved oxygen parameters in the water column";
    String search_keywords_urn "SDN:P02::DOXY";
    String source "observational data from SeaDataNet/EMODnet Chemistry Data Network";
    String sourceUrl "http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2025/Coastal_areas-water_body/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_oxygen_concentration.nc";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary 
"Northeast Atlantic Ocean - Loire River - DIVAnd 4D seasonal analysis of Water body dissolved oxygen concentration 1950/2024 v2025. Seasonal climatology of Water body dissolved oxygen concentration for Loire river for the period 1950-2024 and for the following seasons:
 - winter: January-March,
 - spring: April-June,
 - summer: July-September,
 - autumn: October-December. 
Observation data span from 1950 to 2024. 
Depth levels (m): [0.0, 2.0, 4.0, 6.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0, 40.0, 45.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 110.0, 120.0, 130.0]. 
Data sources: observational data from SeaDataNet/EMODNet Chemistry Data Network. 
Description of DIVAnd analysis: the computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.12, using GEBCO 15 sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps is 0.01 degrees. Horizontal correlation length is defined seasonally (in meters): 150000 (winter), 100000 (spring), 70000 (summer), 115000 (autumn). Vertical correlation length was optimized and vertically filtered and a seasonally-averaged profile was used (DIVAnd.fitvertlen). Signal-to-noise ratio was fixed to 1 for vertical profiles and 0.1 for time series to account for the redundancy in the time series observations. A logarithmic transformation (DIVAnd.loglin) was applied to the data prior to the analysis. Background field: the vertically-filtered data mean profile is substracted from the data. Detrending of data: no, advection constraint applied: no. 
Units: umol/l.";
    String title "Northeast Atlantic Ocean, Loire River, DIVAnd 4D seasonal analysis of Water body dissolved oxygen concentration 1950/2024 v2025 [observations]";
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection constraints (external link)

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

(easy) You can get data by using the dataset's Data Access Form. It makes the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.

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