Make A Graph

Dataset Title:	PSMSL RLR Monthly Mean Sea Level
Institution:	PSMSL (Dataset ID: psmsl_rlr_monthly)
Information:	Summary \| License \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:

X Axis:

Y Axis:

Color:

Constraints	Optional Constraint #1		Optional Constraint #2

Server-side Functions

distinct()

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

Graph Settings

Marker Type:

Size:

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Color Bar:

Continuity:

Scale:

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Maximum:

N Sections:

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(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

)

[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 {
 s {
  station_id {
    Int32 actual_range 1, 2481;
    String ioos_category "Identifier";
    String long_name "Station Id";
  }
  year {
    Float32 actual_range 1807.042, 2025.958;
    String ioos_category "Unknown";
    String long_name "Decimal Year";
    String units "years";
  }
  sea_level {
    Float64 _FillValue -99999.0;
    Float64 actual_range -4041.0, 18808.0;
    String comment "RLR datum is ~7000mm below MSL.";
    String ioos_category "Unknown";
    String long_name "Mean Sea Level (RLR)";
    String units "mm";
  }
  missing_days {
    String comment "99 = unknown number of missing days.";
    String ioos_category "Unknown";
    String long_name "Number of Missing Days";
    String units "days";
  }
  attention_flag {
    String flag_meanings "000: no flags; 001: caution; 010: MTL in MSL series; 011: both flags set";
    String ioos_category "Unknown";
    String long_name "Attention Flag";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_name "PSMSL";
    String creator_type "institution";
    String creator_url "https://psmsl.org/data/obtaining/";
    String history 
"2026-05-13T21:35:24Z https://psmsl.org/data/obtaining/rlr.monthly.data/rlr_monthly.zip
2026-05-13T21:35:24Z http://erddap.ioc-sealevelmonitoring.org/tabledap/psmsl_rlr_monthly.das";
    String infoUrl "https://psmsl.org/data/obtaining/";
    String institution "PSMSL";
    String keywords "monthly, psmsl, rlr, sea level, tide gauge";
    String license "Public data. Citation required. Contact PI before commercial use.";
    String sourceUrl "https://psmsl.org/data/obtaining/rlr.monthly.data/rlr_monthly.zip";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "PSMSL Revised Local Reference (RLR) monthly mean sea level data.";
    String title "PSMSL RLR Monthly Mean Sea Level";
  }
}

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.

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