Data Access Form

Dataset Title:	Great Lakes Long Term Average Ice Concentration, 1973-2015
Institution:	NOAA GLERL (Dataset ID: glerlLTIce1973_2015)
Information:	Summary \| License \| Metadata \| Background \| Subset \| Files \| Make a graph

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Variable

Optional
Constraint #1

Optional
Constraint #2

Minimum

or a List of Values

Maximum

lake

dayOfYear (count)

335

515

ice_concentration (percent)

0.0

70.16

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 {
  lake {
    String comment "h=Huron, o=Ontario, m=Michigan, e=Erie, s=Superior";
    String ioos_category "Location";
    String long_name "Lake";
  }
  dayOfYear {
    Int16 actual_range 335, 515;
    String ioos_category "Time";
    String long_name "Day of Year";
    String units "count";
  }
  ice_concentration {
    Float32 actual_range 0.0, 70.16;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Ice Distribution";
    String long_name "Long Term Average Ice Concentration";
    String units "percent";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "songzhi.liu@noaa.gov";
    String creator_name "NOAA GLERL";
    String creator_url "https://coastwatch.glerl.noaa.gov";
    String defaultDataQuery "&lake=\"s\"";
    String defaultGraphQuery "dayOfYear,temperature&.draw=lines&lake=\"s\"";
    String history 
"2024-12-22T05:57:24Z https://coastwatch.glerl.noaa.gov/statistic/statistic.html
2024-12-22T05:57:24Z https://apps.glerl.noaa.gov/erddap/tabledap/glerlLTIce1973_2015.html";
    String infoUrl "https://coastwatch.glerl.noaa.gov/statistic/statistic.html";
    String institution "NOAA GLERL";
    String keywords "average, concentration, daily, data, day, dayOfYear, environmental, erie, glerl, great, great lakes, huron, ice, laboratory, lakes, long, michigan, noaa, ontario, research, St. Clair, superior, term, time, water, year";
    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 "https://coastwatch.glerl.noaa.gov/statistic/statistic.html";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String subsetVariables "lake";
    String summary "Great Lakes Long Term Average Ice Concentration, 1973-2015. Daily interpolations for 2006-2013 provided by the Great Lakes Aquatic Habitat Framework (http://ifr.snre.umich.edu/projects/glahf/) and used with their permission.";
    String title "Great Lakes Long Term Average Ice Concentration, 1973-2015";
  }
}

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.