Data Access Form

Dataset Title:	SSC-ajac: SLSMF (ajac2) real time sea level data
Institution:	VLIZ (Dataset ID: SSC-ajac_ajac2_SLSMF)
Information:	Summary \| License \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
station_id	"SSC-ajac"	"SSC-ajac"
slevel	-999.0	99.999
time (Stime, UTC)	2011-01-11T05:30:00Z	2025-06-11T12:05:00Z

sensor	"rad"	"rad"

Server-side Functions

distinct()

Hover here to see a list of options. Click on an option to select it.

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 {
 s {
  station_id {
    String ioos_category "Identifier";
    String long_name "Station Id";
  }
  slevel {
    Float32 actual_range -999.0, 99.999;
    String ioos_category "Unknown";
    String long_name "Slevel";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.2947238e+9, 1.7496435e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Stime";
    String source_name "stime";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  sensor {
    String ioos_category "Unknown";
    String long_name "Sensor";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_name "VLIZ";
    String creator_type "institution";
    String creator_url "https://www.ioc-sealevelmonitoring.org/service.php";
    String history 
"2026-03-06T21:24:50Z (local files)
2026-03-06T21:24:50Z http://erddap.ioc-sealevelmonitoring.org/erddap/tabledap/SSC-ajac_ajac2_SLSMF.html";
    String infoUrl "https://www.ioc-sealevelmonitoring.org/service.php";
    String institution "VLIZ";
    String keywords "ajac, ajac2, data, frequency, global, gloss, HF, high, identifier, level, observing, real, real time, relative, rsl, sea, sensor, slevel, slsmf, ssc, ssc-ajac, station, station_id, stime, system, time, vliz";
    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 sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "This Global Sea Level Observing System (GLOSS) data center focusses on collecting and redistributing high frequency, relative sea level data in real-time.";
    String testOutOfDate "now-50days";
    String time_coverage_end "2025-06-11T12:05:00Z";
    String time_coverage_start "2011-01-11T05:30:00Z";
    String title "SSC-ajac: SLSMF (ajac2) real time sea level data";
  }
}

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.