Data Access Form

Dataset Title:	Green, Salish Sea, 3d u Grid Variable Fields, Hourly, v21-11
Institution:	UBC EOAS (Dataset ID: ubcSSg3DuGridFields1hV21-11)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (Time axis, UTC)	157776	1h 0m 0s (even)

depth (m)	40	11.30682 (uneven)

gridY (count)	898	1.0 (even)

gridX (count)	398	1.0 (even)

Grid Variables (which always also download all of the dimension variables)

uVelocity (Ocean Current Along x-axis, m s-1)

File type: (more info)

(Documentation / Bypass this form)

(Please be patient. It may take a while to get the data.)

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.1676114e+9, 1.7356014e+9;
    String axis "T";
    String calendar "gregorian";
    String comment "time values are UTC at the centre of the intervals over which the calculated model results are averaged; e.g. the field average values for the 00:00 to 01:00 UTC hour on 2021-06-03 have a time value of 2021-06-03 00:30:00Z";
    String coverage_content_type "modelResult";
    String ioos_category "Time";
    String long_name "Time axis";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 actual_range 0.5000003, 441.4661;
    String axis "Z";
    String coverage_content_type "modelResult";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  gridY {
    Int16 actual_range 0, 897;
    String comment "gridY values are grid indices in the model y-direction; geo-location data for the SalishSeaCast NEMO model grid is available in the ubcSSnBathymetryV21-08 dataset.";
    String coverage_content_type "modelResult";
    String ioos_category "location";
    String long_name "Grid Y";
    String standard_name "y";
    String units "count";
  }
  gridX {
    Int16 actual_range 0, 397;
    String comment "gridX values are grid indices in the model x-direction; geo-location data for the SalishSeaCast NEMO model grid is available in the ubcSSnBathymetryV21-08 dataset.";
    String coverage_content_type "modelResult";
    String ioos_category "location";
    String long_name "Grid X";
    String standard_name "x";
    String units "count";
  }
  uVelocity {
    Float32 _FillValue 1.0e+20;
    Float64 colorBarMaximum 8.0;
    Float64 colorBarMinimum -8.0;
    String coverage_content_type "modelResult";
    String ioos_category "currents";
    String long_name "Ocean Current Along x-axis";
    Float32 missing_value 1.0e+20;
    String standard_name "sea_water_x_velocity";
    String units "m s-1";
  }
  NC_GLOBAL {
    String acknowledgement "MEOPAR, Ocean Networks Canada (ONC), Digital Research Alliance of Canada";
    String cdm_data_type "Grid";
    String comment 
"If you use this dataset in your research,
please reference it with wording similar to the example below,
and include citations of the publications below.
Inclusion of the date(s) when you downloaded the dataset,
and the dataset id help to ensure reproducibility of your work.

Reference wording:

3d zonal (u) component velocity fields from the SalishSeaCast model
(Soontiens et al, 2016; Soontiens and Allen, 2017)
were downloaded from their ERDDAP server
(https://salishsea.eos.ubc.ca/erddap/)
on DATE from dataset ubcSSg3DuGridFields1hV21-11.

Citations:

Soontiens, N., Allen, S., Latornell, D., Le Souef, K., Machuca, I., Paquin, J.-P., Lu, Y., Thompson, K., Korabel, V., 2016.
Storm surges in the Strait of Georgia simulated with a regional model. Atmosphere-Ocean 54 1-21.
https://dx.doi.org/10.1080/07055900.2015.1108899

Soontiens, N. and Allen, S., 2017.
Modelling sensitivities to mixing and advection in a sill-basin estuarine system. Ocean Modelling, 112, 17-32.
https://dx.doi.org/10.1016/j.ocemod.2017.02.008";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "sallen@eoas.ubc.ca";
    String creator_name "SalishSeaCast Project Contributors";
    String creator_url "https://salishsea-meopar-docs.readthedocs.io/";
    String description "U velocity";
    String drawLandMask "over";
    String history 
"2024-12-31T01:59:39Z (local files)
2024-12-31T01:59:39Z https://salishsea.eos.ubc.ca/erddap/griddap/ubcSSg3DuGridFields1hV21-11.das";
    String infoUrl "https://salishsea.eos.ubc.ca/";
    String institution "UBC EOAS";
    String institution_fullname "Earth, Ocean & Atmospheric Sciences, University of British Columbia";
    String keywords "circulation, current, currents, depthu, Earth Science > Oceans > Ocean Circulation > Ocean Currents, ocean, oceans, sea, sea_water_x_velocity, seawater, time_counter, u grid, u velocity component, velocity along x-axis, vozocrtx";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"The SalishSeaCast NEMO model results are copyright
by the SalishSeaCast Project Contributors and The University of British Columbia.

They are licensed under the Apache License, Version 2.0. https://www.apache.org/licenses/LICENSE-2.0";
    String project "SalishSeaCast NEMO Model";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary 
"Green, Salish Sea, 3d u Grid Variable Fields, Hourly, v21-11

Variable values at the 3d zonal (u) component velocity grid points averaged over 1 hour intervals
from SalishSeaCast NEMO model runs with physics, biology and chemistry. The values are calculated for the entire model grid
that includes the Juan de Fuca Strait, the Strait of Georgia, Puget Sound,
and Johnstone Strait on the coasts of Washington State and British Columbia.
The time values are UTC.
They are the centre of the intervals over which the calculated model results are averaged;
e.g. the field average values for the 00:00 to 01:00 UTC hour on 2021-06-03 have a time value of 2021-06-03 00:30:00Z.
Geo-location and depth data for the SalishSeaCast NEMO model grid are available in the ubcSSnBathymetryV21-08 dataset.

v1: uVelocity variable
v16-10: NEMO-3.6; ubcSSnBathymetry2V16-07 bathymetry; see infoUrl link for full details.
v17-02: NEMO-3.6; ubcSSnBathymetryV17-02 bathymetry; see infoUrl link for full details.
v18-06: NEMO-3.6 SalishSeaCast-201806 configuration; ubcSSnBathymetryV17-02 bathymetry;
        see infoUrl link for full details.
v18-12: NEMO-3.6 SalishSeaCast-201812 configuration; ubcSSnBathymetryV17-02 bathymetry;
        see infoUrl link for full details.
v19-05: NEMO-3.6 SalishSeaCast-201905 configuration; ubcSSnBathymetryV17-02 bathymetry;
        see infoUrl link for full details.
v21-11: NEMO-3.6 SalishSeaCast-202111 configuration; ubcSSnBathymetryV21-08 bathymetry;
        see infoUrl link for full details.";
    String testOutOfDate "now-16hours";
    String time_coverage_end "2024-12-30T23:30:00Z";
    String time_coverage_start "2007-01-01T00:30:00Z";
    String timeStamp "2024-Dec-30 17:03:58 GMT";
    String title "Green, Salish Sea, 3d u Grid Variable Fields, Hourly, v21-11";
    String uuid "63699437-ac0e-485d-ad6d-2f8adde5b3f5";
  }
}

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.