Data Access Form

Dataset Title:	Daily vertical displacement (in millimeters) of SONEL GNSS stations with solution ULR6B
Institution:	SONEL (Dataset ID: sonel_vlm_gnss_ulr6b)
Information:	Summary \| License \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
stationid	"019400jpn"	"zsu100usa"
time (UTC)	1995-01-01T12:15:50Z	2013-12-30T12:05:02Z

par (mm)	-52.19	66.28

Server-side Functions

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  stationid {
    String ioos_category "Identifier";
    String long_name "Stationid";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 7.889625504e+8, 1.388405102399e+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";
  }
  par {
    Float32 actual_range -52.19, 66.28;
    Float64 colorBarMaximum 70.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Optical Properties";
    String long_name "Daily vertical residual displacement (in millimeters) of the GNSS antenna";
    String standard_name "daily_vertical_residual_displacement_in_millimeters_of_the_gnss_antenna";
    String units "mm";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_name "SONEL";
    String creator_type "institution";
    String creator_url "https://www.sonel.org/-GPS-.html";
    String history 
"2026-05-13T21:33:31Z https://api.sonel.org/v1/products/vlm/gnss/timeseries?sampling=daily
2026-05-13T21:33:31Z http://erddap.ioc-sealevelmonitoring.org/erddap/tabledap/sonel_vlm_gnss_ulr6b.html";
    String infoUrl "https://www.sonel.org/-GPS-.html";
    String institution "SONEL";
    String keywords "displacement, GNSS, IGS14, ITRF, precision, SONEL, Tide Gauge, Vertical Land Motion, VLM";
    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, 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 solution "ULR6B";
    String sourceUrl "https://api.sonel.org/v1/products/vlm/gnss/timeseries?sampling=daily";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "SONEL GNSS Vertical Land Motion (VLM) Time Series With Solution ULR6B";
    String time_coverage_end "2013-12-30T12:05:02Z";
    String time_coverage_start "1995-01-01T12:15:50Z";
    String title "Daily vertical displacement (in millimeters) of SONEL GNSS stations with solution ULR6B";
  }
}

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link)

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.
(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.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
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
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.