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Dataset Title:	Tide Model (Barotropic) for the Pacific Ocean: Tidal Velocity
Institution:	Pacific Islands Ocean Observing System (PacIOOS) (Dataset ID: tide_pac_vel)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

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Graph Type:
X Axis:
Y Axis:
Vector X:
Vector Y:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

depth (m)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings

Color:

Vector Standard:

Y Axis Minimum:

Maximum:

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

Optional:
Then set the File Type: (File Type information)
and

or view the URL:
(Documentation / Bypass this form

)

Click on the map to specify a new center point.

Zoom:

[The graph you specified. Please be patient.]

Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6725312e+9, 1.735686e+9;
    String axis "T";
    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";
    Float64 actual_range 0.0, 0.0;
    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";
    Float64 actual_range -66.0, 66.0;
    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 118.0, 290.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  u {
    Float64 _FillValue -999.99;
    Float64 colorBarMaximum 0.15;
    Float64 colorBarMinimum -0.15;
    String ioos_category "Currents";
    String long_name "u-velocity component";
    Float64 missing_value -999.99;
    String standard_name "eastward_sea_water_velocity";
    String units "meter second-1";
  }
  v {
    Float64 _FillValue -999.99;
    Float64 colorBarMaximum 0.15;
    Float64 colorBarMinimum -0.15;
    String ioos_category "Currents";
    String long_name "v-velocity component";
    Float64 missing_value -999.99;
    String standard_name "northward_sea_water_velocity";
    String units "meter second-1";
  }
  NC_GLOBAL {
    String acknowledgement "The Pacific Islands Ocean Observing System (PacIOOS) is funded through the National Oceanic and Atmospheric Administration (NOAA) as a Regional Association within the U.S. Integrated Ocean Observing System (IOOS). PacIOOS is coordinated by the University of Hawaii School of Ocean and Earth Science and Technology (SOEST).";
    String cdm_data_type "Grid";
    String comment "Model runs produced by Jim Potemra (jimp@hawaii.edu).";
    String contributor2_email "jimp@hawaii.edu";
    String contributor2_institution "University of Hawaii at Manoa";
    String contributor2_name "James T. Potemra";
    String contributor2_role "custodian";
    String contributor2_type "person";
    String contributor2_url "https://iprc.soest.hawaii.edu/people/potemra.php";
    String contributor_email "serofeev@ceoas.oregonstate.edu";
    String contributor_institution "Oregon State University (OSU)";
    String contributor_name "Svetlana Y. Erofeeva";
    String contributor_role "originator";
    String contributor_type "person";
    String contributor_url "https://ceoas.oregonstate.edu/svetlana-erofeeva";
    String Conventions "CF-1.6, ACDD-1.3";
    String creator_email "egbert@coas.oregonstate.edu";
    String creator_institution "Oregon State University (OSU)";
    String creator_name "Gary D. Egbert";
    String creator_type "person";
    String creator_url "https://ceoas.oregonstate.edu/profile/egbert/";
    String date_created "2011-06-27";
    String date_issued "2011-06-27";
    String date_metadata_modified "2023-12-07";
    String date_modified "2023-12-07";
    String defaultGraphQuery "u,v&.draw=vectors";
    Float64 Easternmost_Easting 290.0;
    String geospatial_bounds "POLYGON ((-66.0 118.0, 66.0 118.0, 66.0 180.0, -66.0 180.0, -66.0 118.0), (-66.0 -180.0, 66.0 -180.0, 66.0 -70.0, -66.0 -70.0, -66.0 -180.0))";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 66.0;
    Float64 geospatial_lat_min -66.0;
    Float64 geospatial_lat_resolution 2.0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 290.0;
    Float64 geospatial_lon_min 118.0;
    Float64 geospatial_lon_resolution 2.0;
    String geospatial_lon_units "degrees_east";
    String history 
"2011-06-27T00:00:00Z New PacIOOS dataset (J. Potemra) using Oregon State University (OSU) Tidal Prediction Software (OTPS).
2019-11-29T00:00:00Z Limited archive to 2019-2020.
2020-12-07T00:00:00Z Limited archive to 2020-2021.
2021-12-15T00:50:00Z Limited archive to 2020-2022.
2022-12-08T22:38:00Z Limited archive to 2021-2023.
2023-12-07T20:05:00Z Limited archive to 2023-2024.
2024-10-30T20:47:49Z https://pae-paha.pacioos.hawaii.edu/thredds/dodsC/tide_pac
2024-10-30T20:47:49Z https://pae-paha.pacioos.hawaii.edu/griddap/tide_pac_vel.das";
    String id "tide_pac";
    String infoUrl "http://volkov.oce.orst.edu/tides/PO.html";
    String institution "Pacific Islands Ocean Observing System (PacIOOS)";
    String instrument "Not Applicable > Not Applicable";
    String instrument_vocabulary "GCMD Instrument Keywords";
    String ISO_Topic_Categories "oceans";
    String keywords "Earth Science > Oceans > Ocean Circulation > Ocean Currents, Earth Science > Oceans > Sea Surface Topography > Sea Surface Height, Earth Science > Oceans > Tides > Tidal Height, Earth Science Services > Models > Ocean General Circulation Models (OGCM)/Regional Ocean Models, Earth Science Services > Models > Weather Research/Forecast Models";
    String keywords_vocabulary "GCMD Science Keywords";
    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, University of Hawaii, PacIOOS, NOAA, State of Hawaii 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 locations "Ocean > Pacific Ocean";
    String locations_vocabulary "GCMD Location Keywords";
    String metadata_link "https://www.pacioos.hawaii.edu/metadata/tide_pac.html";
    String naming_authority "org.pacioos";
    Float64 Northernmost_Northing 66.0;
    String platform "Models/Analyses > > Operational Models";
    String platform_vocabulary "GCMD Platform Keywords";
    String program "Pacific Islands Ocean Observing System (PacIOOS)";
    String project "Pacific Islands Ocean Observing System (PacIOOS)";
    String publisher_email "info@pacioos.org";
    String publisher_institution "Pacific Islands Ocean Observing System (PacIOOS)";
    String publisher_name "Pacific Islands Ocean Observing System (PacIOOS)";
    String publisher_type "institution";
    String publisher_url "http://www.pacioos.hawaii.edu";
    String references "https://www.tpxo.net/otis";
    String source "Oregon State University (OSU) Tidal Prediction Software (OTPS), OSU Tidal Data Inversion (OTIS)";
    String sourceUrl "https://pae-paha.pacioos.hawaii.edu/thredds/dodsC/tide_pac";
    Float64 Southernmost_Northing -66.0;
    String standard_name_vocabulary "CF Standard Name Table v39";
    String summary "Barotropic tide model for the Pacific Ocean. The model is based on harmonics distributed by Oregon State University (OSU) and assimilates satellite altimetry data from TOPEX/Poseidon. It was generated using OSU Tidal Prediction Software (OTPS), modified locally by J. Potemra, using barotropic inverse tidal solutions from OSU. While considerable effort has been made to implement all model components in a thorough, correct, and accurate manner, numerous sources of error are possible. As such, please use this output with the caution appropriate for any ocean related activity.";
    String time_coverage_end "2024-12-31T23:00:00Z";
    String time_coverage_resolution "PT1H";
    String time_coverage_start "2023-01-01T00:00:00Z";
    String title "Tide Model (Barotropic) for the Pacific Ocean: Tidal Velocity";
    Float64 Westernmost_Easting 118.0;
  }
}

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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