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Dataset Title:	Model Monthly Means
Institution:	Irish Marine Institute (Dataset ID: IMI_Model_Stats)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (time of mid month, UTC)	154	30 days 10h 30m 35s (uneven)

latitude (degrees_north)	440	0.025 (even)

longitude (degrees_east)	640	0.025 (even)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3265856e+9, 1.7289504e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "time of mid month";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 48.0125, 58.9875;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -17.9875, -2.0125;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  sea_surface_temperature {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "20.0";
    String colorBarMinimum "0";
    String colorBarPalette "KT_thermal";
    String coordinates "time latitude longitude";
    String ioos_category "Temperature";
    String long_name "Monthly mean sea surface temperature";
    Float64 missing_value -9999.0;
    String standard_name "sea_surface_temperature";
    String time "time";
    String units "C";
  }
  sea_bottom_temperature {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "20.0";
    String colorBarMinimum "0";
    String colorBarPalette "KT_thermal";
    String coordinates "time latitude longitude";
    String ioos_category "Temperature";
    String long_name "Monthly mean sea bottom temperature";
    Float64 missing_value -9999.0;
    String standard_name "sea_bottom_temperature";
    String time "time";
    String units "C";
  }
  sea_surface_salinity {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "36.0";
    String colorBarMinimum "20";
    String colorBarPalette "KT_haline";
    String coordinates "time latitude longitude";
    String ioos_category "Salinity";
    String long_name "Monthly mean sea surface salinity";
    Float64 missing_value -9999.0;
    String standard_name "sea_surface_salinity";
    String time "time";
    String units "PSU";
  }
  sea_bottom_salinity {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "36.0";
    String colorBarMinimum "30";
    String colorBarPalette "KT_haline";
    String coordinates "time latitude longitude";
    String ioos_category "Salinity";
    String long_name "Monthly mean sea bottom salinity";
    Float64 missing_value -9999.0;
    String standard_name "sea_bottom_salinity";
    String time "time";
    String units "PSU";
  }
  sea_surface_x_velocity {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "1";
    String colorBarMinimum "-1";
    String coordinates "time latitude longitude";
    String ioos_category "Currents";
    String long_name "Monthly mean surface U velocity component";
    Float64 missing_value -9999.0;
    String standard_name "sea_surface_x_velocity";
    String time "time";
    String units "m/s";
  }
  sea_surface_y_velocity {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "1";
    String colorBarMinimum "-1";
    String coordinates "time latitude longitude";
    String ioos_category "Currents";
    String long_name "Monthly mean surface V velocity component";
    Float64 missing_value -9999.0;
    String standard_name "sea_surface_y_velocity";
    String time "time";
    String units "m/s";
  }
  mixed_layer_depth {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "100";
    String colorBarMinimum "0";
    String colorBarPalette "KT_deep";
    String coordinates "time latitude longitude";
    String ioos_category "Other";
    String long_name "Monthly mean mixed layer depth";
    Float64 missing_value -9999.0;
    String standard_name "mixed_layer_depth";
    String time "time";
    String units "m";
  }
  significant_wave_height {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "4";
    String colorBarMinimum "0";
    String colorBarPalette "KT_amp";
    String coordinates "time latitude longitude";
    String ioos_category "Surface Waves";
    String long_name "Monthly mean significant wave height";
    Float64 missing_value -9999.0;
    String standard_name "significant_wave_height";
    String time "time";
    String units "m";
  }
  mean_wave_direction {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "360";
    String colorBarMinimum "0";
    String coordinates "time latitude longitude";
    String ioos_category "Surface Waves";
    String long_name "Monthly mean mean wave direction";
    Float64 missing_value -9999.0;
    String standard_name "mean_wave_direction";
    String time "time";
    String units "degrees";
  }
  mean_wave_period {
    Float64 _FillValue -9999.0;
    String colorBarMaximum "15";
    String colorBarMinimum "0";
    String colorBarPalette "KT_tempo";
    String coordinates "time latitude longitude";
    String ioos_category "Surface Waves";
    String long_name "Monthly mean absolute zero-crossing period";
    Float64 missing_value -9999.0;
    String standard_name "mean_wave_period";
    String time "time";
    String units "s";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    Float64 Easternmost_Easting -2.0125;
    Float64 geospatial_lat_max 58.9875;
    Float64 geospatial_lat_min 48.0125;
    Float64 geospatial_lat_resolution 0.024999999999999988;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -2.0125;
    Float64 geospatial_lon_min -17.9875;
    Float64 geospatial_lon_resolution 0.025;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-11-22T03:16:59Z http://milas.marine.ie/thredds/dodsC/IMI_MODEL_STATISTICS/MONTHLY_STATISTICS
2024-11-22T03:16:59Z https://erddap.marine.ie/erddap/griddap/IMI_Model_Stats.das";
    String infoUrl "https://data.marine.ie/geonetwork/srv/eng/catalog.search#/metadata/ie.marine.data:dataset.2782";
    String institution "Irish Marine Institute";
    String license "Creative Commons Attribution 4.0 (https://creativecommons.org/licenses/by/4.0/)";
    Float64 Northernmost_Northing 58.9875;
    String sourceUrl "http://milas.marine.ie/thredds/dodsC/IMI_MODEL_STATISTICS/MONTHLY_STATISTICS";
    Float64 Southernmost_Northing 48.0125;
    String summary "Irish Marine Institute modelled monthly means for Irish waters";
    String time_coverage_end "2024-10-15T00:00:00Z";
    String time_coverage_start "2012-01-15T00:00:00Z";
    String title "Model Monthly Means";
    Float64 Westernmost_Easting -17.9875;
  }
}

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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.
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(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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