Data Access Form

Dataset Title:	SalishSeaCast NEMO Model Grid, Geo-location and Bathymetry, v21-08
Institution:	UBC EOAS (Dataset ID: ubcSSnBathymetryV21-08)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
gridY (count)	898	1.0 (even)

gridX (count)	398	1.0 (even)

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

bathymetry (Sea Floor Depth, metres)

latitude (degrees_north)

longitude (degrees_east)

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 {
  gridY {
    Int32 actual_range 0, 897;
    String comment "y values are grid indices in the model y-direction.";
    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 "x values are grid indices in the model x-direction.";
    String coverage_content_type "modelResult";
    String ioos_category "location";
    String long_name "Grid X";
    String standard_name "x";
    String units "count";
  }
  bathymetry {
    Float64 _FillValue 0.0;
    Float64 colorBarMaximum 450.0;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "OceanDepth";
    String coverage_content_type "modelResult";
    String ioos_category "bathymetry";
    Float64 least_significant_digit 0.1;
    String long_name "Sea Floor Depth";
    String standard_name "sea_floor_depth";
    String units "metres";
  }
  latitude {
    Float64 colorBarMaximum 52.0;
    Float64 colorBarMinimum 46.0;
    String coverage_content_type "modelResult";
    String ioos_category "location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    Float64 colorBarMaximum -121.0;
    Float64 colorBarMinimum -127.0;
    String coverage_content_type "modelResult";
    String ioos_category "location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  NC_GLOBAL {
    String acknowledgement 
"Canadian Hydrographic Service (CHS),
National Ocean and Atmospheric Administration (NOAA),
United States Geological Service (USGS),
Digital Research Alliance of Canada

This product has been produced by the University of British Columbia based in part on
Canadian Hydrographic Service charts and/or data, pursuant to CHS Direct User Licence
No. 2016-0504-1260-U.

The incorporation of data sourced from CHS in this product shall not be construed as
constituting an endorsement of CHS of this product.

This product does not meet the requirements of Charts and Nautical Publications Regulations,
1995 under the Canadian Shipping Act, 2001.
Official charts and publications, corrected and up-to-data,
must be used to meet the requirements of those regulations.";
    String cdm_data_type "Grid";
    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 drawLandMask "over";
    String history 
"[2021-08-06 09:57:36] Created netCDF4 zlib=True dataset.
2024-12-31T02:09:51Z (local files)
2024-12-31T02:09:51Z https://salishsea.eos.ubc.ca/erddap/griddap/ubcSSnBathymetryV21-08.das";
    String infoUrl "https://salishsea.eos.ubc.ca/";
    String institution "UBC EOAS";
    String institution_fullname "Dept of Earth, Ocean & Atmospheric Sciences, University of British Columbia";
    String keywords "bathymetry, depth, Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry, latitude, longitude, nav_lat, nav_lon, ocean, oceans, Salish Sea, sea floor, sea_floor_depth, seafloor, topography";
    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 references "https://github.com/SalishSeaCast/grid/blob/main/bathymetry_202108.nc";
    String source "https://github.com/SalishSeaCast/tools/blob/main/bathymetry/Process202108Bathymetry.ipynb";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary 
"SalishSeaCast NEMO Model Grid, Geo-location and Bathymetry, v21-08

Longitude, latitude, and bathymetry of the SalishSeaCast NEMO model grid.
The bathymetry values are those calculated by NEMO from the input bathymetry file.
NEMO modifies the input bathymetry to remove isolated holes, and too-small partial steps;
See the ubcSSn2DMeshMaskV21-08 dataset for the complete details of the calculation grid.
The model grid includes the Juan de Fuca Strait, the Strait of Georgia, Puget Sound,
and Johnstone Strait on the coasts of Washington State and British Columbia.

v1: longitude, latitude and bathymetry variables
v16-07: same variables,
        bathymetry uniformly deepened by 1 grid level,
        smoothed at Juan de Fuca & Johnstone Strait open boundaries,
        Fraser River lengthened,
        bathymetry deepened near mouth of Fraser River
v17-02: same variables,
        Bathymetry composed from 3 datasets:
        * USGS Digital elevation model (DEM) of Cascadia, latitude 39N-53N, longitude 116W-133W, Open-File Report 99-369, https://pubs.er.usgs.gov/publication/ofr99369
        * NOAA British Columbia, 3 arc-second MSL DEM, https://www.ngdc.noaa.gov/dem/squareCellGrid/download/4956
        * CHS Multibeam data and all point cloud data for the Salish Sea.
        Straightened and smoothed Juan de Fuca & Johnstone Strait open boundaries.
        Added proxy channel for Fraser River upstream of confluence with the Pitt River.
        Adjustments by Michael Dunphy to increase resolution of Fraser River channels downstream of
        confluence with the Pitt River.
v21-08: same variables,
        Bathymetry composed from 3 datasets:
        * USGS Digital elevation model (DEM) of Cascadia, latitude 39N-53N, longitude 116W-133W, Open-File Report 99-369, https://pubs.er.usgs.gov/publication/ofr99369
        * NOAA British Columbia, 3 arc-second MSL DEM, https://www.ngdc.noaa.gov/dem/squareCellGrid/download/4956
        * CHS Multibeam data and all point cloud data for the Salish Sea.
        Straightened and smoothed Juan de Fuca & Johnstone Strait open boundaries.
        Added proxy channel for Fraser River upstream of confluence with the Pitt River.
        Adjustments by Michael Dunphy to increase resolution of Fraser River channels downstream of
        confluence with the Pitt River.
        Moved coastline to 2m isobath and set depth there to 4m; in contrast to 4m depth at 0m isobath;
        volume is approximately conserved.
        Deepened Tacoma Narrows to chart depth.
        Added Fraser River North Arm spit,
        Iona sewage outfall spit,
        Robert's Bank port facility,
        and Tsawwassen ferry terminal.";
    String title "SalishSeaCast NEMO Model Grid, Geo-location and Bathymetry, v21-08";
  }
}

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.