Data Access Form

Dataset Title:	Best NWPS PHI Time Series [time], 2021-present
Institution:	NCEP (Dataset ID: ioos_eds_2ab0_d897_3b44)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

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Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				895	1h 0m 0s (even)

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

reftime (GRIB reference time, seconds since 1970-01-01T00:00:00Z)

File type: (more information)

(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 1.6358544e+9, 1.6390728e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "GRIB forecast or observation time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  reftime {
    String _CoordinateAxisType "RunTime";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "GRIB reference time";
    String standard_name "forecast_reference_time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.dataset.conv.CF1Convention";
    String Analysis_or_forecast_generating_process_identifier_defined_by_originating_centre "Nearshore Wave Prediction System (NWPS)";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_name "NCEP";
    String creator_type "institution";
    String creator_url "https://www.ncep.noaa.gov/";
    String file_format "GRIB-2";
    String GRIB_table_version "2,1";
    String grid_mapping__CoordinateAxisTypes "Lat Lon";
    String grid_mapping__CoordinateTransformType "Projection";
    Float64 grid_mapping_earth_radius 6371229.0;
    String grid_mapping_name "latitude_longitude";
    String history 
"Read using CDM IOSP GribCollection v3
2024-11-21T15:54:28Z https://eds.ioos.us/thredds/dodsC/ioos/nwps/phi/Best
2024-11-21T15:54:28Z http://upwell.pfeg.noaa.gov/erddap/griddap/ioos_eds_2ab0_d897_3b44.das";
    String id "ioos/nwps/phi/Best";
    String infoUrl "https://eds.ioos.us/thredds/dodsC/ioos/nwps/phi/Best.html";
    String institution "NCEP";
    String keywords "best, centers, data, environmental, forecast, forecast_reference_time, grib, national, ncep, nwps, phi, prediction, reference, reftime, series, time, time series";
    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, ERD, NOAA, 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 Originating_or_generating_Center "US National Weather Service, National Centres for Environmental Prediction (NCEP)";
    String Originating_or_generating_Subcenter "0";
    String sourceUrl "https://eds.ioos.us/thredds/dodsC/ioos/nwps/phi/Best";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Single time dimension: for each forecast time, use GRIB record with smallest offset from reference time";
    String testOutOfDate "now+4days";
    String time_coverage_end "2021-12-09T18:00:00Z";
    String time_coverage_start "2021-11-02T12:00:00Z";
    String title "Best NWPS PHI Time Series [time], 2021-present";
    String Type_of_generating_process "Forecast";
  }
}

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://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.