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Dataset Title:	Northeast Pacific Regional Climatology : salinity Summer (Jul-Sep) 1.00 degree, 0000
Institution:	NOAA (Dataset ID: noaa_nodc_e542_7291_e227)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	4	91 days 8h 0m 0s (even)

depth (m)	102	54.45545 (uneven)

latitude (degrees_north)	36	1.0 (even)

longitude (degrees_east)	35	1.0 (even)

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

s_an (Objectively analyzed mean fields for salinity at standard depth levels., PSU)

s_mn (PSU)

s_dd (1)

s_sd (1)

s_se (1)

s_oa (statistical mean value minus the objectively analyzed mean value for salinity., 1)

s_ma (PSU)

s_gp (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 -6.21634176e+10, -6.2139744e+10;
    String axis "T";
    String climatology "climatology_bounds";
    String ioos_category "Time";
    String long_name "Time";
    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 0.0, 5500.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 20.5, 55.5;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -139.5, -105.5;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  s_an {
    Float32 _FillValue 9.96921e+36;
    String cell_methods "area: mean depth: mean time: mean";
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String grid_mapping "crs";
    String ioos_category "Sea Level";
    String long_name "Objectively analyzed mean fields for salinity at standard depth levels.";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  s_mn {
    Float32 _FillValue 9.96921e+36;
    String cell_methods "area: mean depth: mean time: mean";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String grid_mapping "crs";
    String ioos_category "Quality";
    String long_name "Average of all unflagged interpolated values at each standard depth level for salinity in each grid-square which contain at least one measurement.";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  s_dd {
    Int32 _FillValue -32767;
    String cell_methods "area: sum depth: point time: sum";
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String grid_mapping "crs";
    String ioos_category "Statistics";
    String long_name "The number of observations of salinity in each grid-square at each standard depth level.";
    String standard_name "salinity number_of_observations";
    String units "1";
  }
  s_sd {
    Float32 _FillValue 9.96921e+36;
    String cell_methods "area: mean depth: mean time: standard_deviation";
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum 0.0;
    String grid_mapping "crs";
    String ioos_category "Statistics";
    String long_name "The standard deviation about the statistical mean of salinity in each grid-square at each standard depth level.";
    String units "1";
  }
  s_se {
    Float32 _FillValue 9.96921e+36;
    String cell_methods "area: mean depth: mean time: mean";
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum 0.0;
    String grid_mapping "crs";
    String ioos_category "Statistics";
    String long_name "The standard error about the statistical mean of salinity in each grid-square at each standard depth level.";
    String standard_name "salinity standard_error";
    String units "1";
  }
  s_oa {
    Float32 _FillValue 9.96921e+36;
    String cell_methods "area: mean depth: mean time: mean";
    String grid_mapping "crs";
    String ioos_category "Salinity";
    String long_name "statistical mean value minus the objectively analyzed mean value for salinity.";
    String units "1";
  }
  s_ma {
    Float32 _FillValue 9.96921e+36;
    String cell_methods "area: mean depth: mean time: mean";
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String grid_mapping "crs";
    String ioos_category "Salinity";
    String long_name "The objectively analyzed value for the given time period minus the objectively analyzed annual mean value for salinity.";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  s_gp {
    Int32 _FillValue -32767;
    String cell_methods "area: mean depth: mean time: mean";
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String grid_mapping "crs";
    String ioos_category "Statistics";
    String long_name "The number of grid-squares within the smallest radius of influence around each grid-square which contain a statistical mean for salinity.";
    String units "1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment "Northeast Pacific Regional Climatology as part of the Ocean Regional Climatologies Project";
    String contributor_name "Regional Climatology Team";
    String contributor_role "Calculation of climatologies";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "NODC.Services@noaa.gov";
    String creator_name "Regional Climatology Team";
    String creator_type "group";
    String creator_url "https://www.nodc.noaa.gov";
    String date_created "2017-07-11";
    String date_modified "2017-07-11";
    Float64 Easternmost_Easting -105.5;
    Float64 geospatial_lat_max 55.5;
    Float64 geospatial_lat_min 20.5;
    Float64 geospatial_lat_resolution 1.0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -105.5;
    Float64 geospatial_lon_min -139.5;
    Float64 geospatial_lon_resolution 1.0;
    String geospatial_lon_units "degrees_east";
    String history 
"2018-08-21T04:05:32Z https://data.nodc.noaa.gov/thredds/dodsC/ncml/regclim/nep_ncml/salinity/salinity_seasonal_one.ncml
2018-08-21T04:05:32Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_nodc_e542_7291_e227.das";
    String id "ncml/regclim/nep_ncml/salinity/salinity_seasonal_one.ncmlhttps://data.nodc.noaa.gov/thredds/dodsC/ncml/regclim/nep_ncml/salinity/salinity_seasonal_one.ncml";
    String infoUrl "https://www.nodc.noaa.gov/OC5/regional_climate/nep-climate";
    String institution "NOAA";
    String keywords "about, all, analyzed, annual, around, average, climatology, contain, data, degree, density, depth, deviation, each, earth, Earth Science > Oceans > Salinity/Density > Salinity, east, error, fields, given, grid, grid-square, grid-squares, influence, interpolated, jul-sep, latitude, least, level, levels, longitude, mean, measurement, minus, nep, noaa, north, northeast, number, objectively, observations, ocean, oceans, one, pacific, period, practical, quality, radius, regional, s_an, s_dd, s_gp, s_ma, s_mn, s_oa, s_sd, s_se, salinity, salinity number_of_observations, salinity standard_error, science, sea, sea level, sea_water_practical_salinity, seawater, smallest, square, squares, standard, statistical, statistics, summer, time, unflagged, value, values, water, which, within";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "These data are openly available to the public. Please acknowledge the use of these data with the text given in the acknowledgment attribute.";
    String metadata_link "https://www.nodc.noaa.gov/OC5/regional_climate/nep-climate";
    String naming_authority "gov.noaa.nodc";
    String nodc_template_version "NODC_NetCDF_Grid_Template_v1.0";
    Float64 Northernmost_Northing 55.5;
    String processing_level "processed";
    String project "Norheast Pacific Regional Climatology as part of the Ocean Regional Climatologies Project";
    String publisher_email "NODC.Services@noaa.gov";
    String publisher_name "National Centers for Environmental Information (NCEI)";
    String publisher_type "group";
    String publisher_url "https://www.nodc.noaa.gov/";
    String references "Seidov, D., O.K. Baranova, T.P. Boyer, S.L. Cross, A.V. Mishonov and A.R. Parsons (2017), Northeast Pacific Regional Climatology, Regional Climatology Team, NOAA/NCEI (www.nodc.noaa.gov/OC5/regional_climate/nep-climate).";
    String sourceUrl "https://data.nodc.noaa.gov/thredds/dodsC/ncml/regclim/nep_ncml/salinity/salinity_seasonal_one.ncml";
    Float64 Southernmost_Northing 20.5;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Climatological mean salinity for the Northeast Pacific from in situ profile data";
    String time_coverage_duration "P03M";
    String time_coverage_end "0000-11-16T00:00:00Z";
    String time_coverage_resolution "P03M";
    String time_coverage_start "0000-02-16T00:00:00Z";
    String title "Northeast Pacific Regional Climatology : salinity Summer (Jul-Sep) 1.00 degree, 0000";
    Float64 Westernmost_Easting -139.5;
  }
}

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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://upwell.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://upwell.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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