Data Access Form

Dataset Title:	PSMSL Revised Local Reference (RLR) annual data
Institution:	PSMSL (Dataset ID: PSMSL_rlr_annual)
Information:	Summary \| License \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
stationid (psmsl station id)	1	2417
time (UTC)	1807-01-01T00:00:00Z	2023-01-01T00:00:00Z

SLEV (mean sea level, mm)	-4244.0	2830.0
MISSINGDAYSFLAG (1)
ATTENTIONFLAG (1)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  stationid {
    Int32 _FillValue 2147483647;
    Int32 actual_range 1, 2417;
    String long_name "psmsl station id";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range -5.143824e+9, 1.6725312e+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";
  }
  SLEV {
    Float64 actual_range -4244.0, 2830.0;
    String long_name "mean sea level";
    Float64 missing_value -106999.0;
    String units "mm";
  }
  MISSINGDAYSFLAG {
    String flag_meanings "The missing days flag is either \"N\" or \"Y\". \"Y\" indicates that either one monthly value is missing from the average or that the total number of missing days in the year was at least 30. If over two monthly values are missing, no annual mean is calculated";
    String long_name "missing days flag for the year";
    String units "1";
  }
  ATTENTIONFLAG {
    String flag_meanings "For both the monthly and annual data, the 'flag for attention' is \"001\", indicating that the data should be treated with caution and that the associated documentation file should be read. A second flag, \"010\", indicates a mean tidal level (MTL) value in a mean sea level (MSL) time series. (Note that these values may have been adjusted to a MSL estimate in the RLR time series. See the psmsl.hel file.) These flags are based upon the octal representation used for UNIX permission flags. For example, a value of \"011\" indicates both that the 'flag for attention' and the MTL flags are set.";
    String long_name "number of missing days of data in the month";
    String units "1";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String citation "Permanent Service for Mean Sea Level (PSMSL), 2020, \"Tide Gauge Data\", Retrieved 01 Jun 2020 from http://www.psmsl.org/data/obtaining/";
    String contact "contacts at emodnet-physics.eu";
    String Conventions "COARDS, CF-1.6, ACDD-1.3, NCCSV-1.2";
    String creator_email "psmsl at noc.ac.uk";
    String creator_name "EMODnet Physics";
    String creator_type "institution";
    String creator_url "http://www.emodnet-physics.eu/";
    String DOI "https://doi.org/10.2112/JCOASTRES-D-12-00175.1";
    String history 
"2024-12-22T06:16:14Z (local files)
2024-12-22T06:16:14Z https://erddap.sochic-h2020.eu/erddap/tabledap/PSMSL_rlr_annual.html";
    String infoUrl "https://www.psmsl.org/";
    String institution "PSMSL";
    String license "These data are public and free of charge. User assumes all risk for use of data. User must display citation in any publication or product using data. User must contact PI prior to any commercial use of data.";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Permanent Service for Mean Sea Level (PSMSL), 2020, \"Tide Gauge Data\", Retrieved 01 Jun 2020 from http://www.psmsl.org/data/obtaining/";
    String time_coverage_end "2023-01-01T00:00:00Z";
    String time_coverage_start "1807-01-01T00:00:00Z";
    String title "PSMSL Revised Local Reference (RLR) annual data";
  }
}

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Data Access Protocol (DAP) (external link)

and its selection 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 or Subset form. They make the URL for you.
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Tabledap request URLs must be in the form
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For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
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For details, see the tabledap Documentation.