Make A Graph

Dataset Title:	SMAP 0.25x0.25 deg grid averaged 8-day SSS/WSPD
Institution:	Jet Propulsion Laboratory (Dataset ID: NASA_SSS_2018_v1)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
Color Bar:	Continuity:	Scale:
Minimum:	Maximum:	N Sections:
Draw land mask:
Y Axis Minimum:	Maximum:

(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:
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Click on the map to specify a new center point.

Zoom:

[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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.514808e+9, 1.5462576e+9;
    String axis "T";
    String calendar "gregorian";
    String comment "Midpoint of time interval of analyzed fields";
    String ioos_category "Time";
    String long_name "Reference time of SSS field";
    String observation_type "measured";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.875, 89.875;
    String axis "Y";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -179.875, 179.875;
    String axis "X";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  smap_high_spd {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Wind";
    String long_name "SMAP 10 m wind speed (using ancillary SSS)";
    String standard_name "wind_speed";
    String units "m s-1";
    Float64 valid_max 100.0;
    Float64 valid_min 0.0;
  }
  smap_spd {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Wind";
    String long_name "SMAP 10 m wind speed";
    String standard_name "wind_speed";
    String units "m s-1";
    Float64 valid_max 100.0;
    Float64 valid_min 0.0;
  }
  anc_sst {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 305.0;
    Float64 colorBarMinimum 273.0;
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Temperature";
    String long_name "Sea surface temperature";
    String standard_name "sea_surface_temperature";
    String units "K";
    Float64 valid_max 340.0;
    Float64 valid_min 0.0;
  }
  anc_sss {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Salinity";
    String long_name "HYCOM sea surface salinity";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
    Float64 valid_max 45.0;
    Float64 valid_min 0.0;
  }
  smap_sss {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Salinity";
    String long_name "SMAP sea surface salinity";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
    Float64 valid_max 45.0;
    Float64 valid_min 0.0;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment "Gaussian-weighted map gridding of SMAP L2B SSS Product";
    String contributor_name "Alexander Fore, Simon Yueh, Wenqing Tang, Akiko Hayashi, Bryan Stiles";
    String Conventions "CF-1.6, ACDD-1.3, COARDS";
    String creator_email "fore@jpl.nasa.gov";
    String creator_name "JPL";
    String creator_type "institution";
    String creator_url "https://www.jpl.nasa.gov/";
    String date_created "2020-10-22T18:32:27.362Z";
    Float64 Easternmost_Easting 179.875;
    Float64 Gaussian_window_half_power 30.0;
    Float64 Gaussian_window_radius 45.0;
    Float64 geospatial_lat_max 89.875;
    Float64 geospatial_lat_min -89.875;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.875;
    Float64 geospatial_lon_min -179.875;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"DATA_SOURCE_VERSION V5.0 L2B SMAP SSS/WSPD
2021-10-14 15:36:34 GMT Hyrax-1.16.0 https://opendap.jpl.nasa.gov/opendap/allData/smap/L3/JPL/V5.0/8day_running/2018/058/SMAP_L3_SSS_20180303_8DAYS_V5.0.nc.nc4?
2025-04-30T03:59:16Z (local files)
2025-04-30T03:59:16Z https://erddap.aoml.noaa.gov/hdb/griddap/NASA_SSS_2018_v1.das";
    String infoUrl "https://www.jpl.nasa.gov/";
    String institution "Jet Propulsion Laboratory";
    String keywords "0.25x0.25, 8-day, anc_sss, anc_sst, ancillary, atmosphere, atmospheric, averaged, coordinate, data, day, density, earth, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, Earth Science > Oceans > Salinity/Density > Salinity, grid, https://smap.jpl.nasa.gov/, hybrid, hycom, jet, jet propulsion laboratory, laboratory, latitude, longitude, model, nasa, ocean, oceans, practical, propulsion, salinity, science, sea, sea surface salinity, sea_surface_temperature, sea_water_practical_salinity, seawater, smap, smap radiometer, smap_high_spd, smap_spd, smap_sss, speed, sss, surface, temperature, time, using, water, wind, wind_speed, winds, wspd";
    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.";
    Float64 Northernmost_Northing 89.875;
    String platform "SMAP";
    String processing_level "3";
    String product_version "V5.0";
    String project "SMAP";
    String publisher_email "fore@jpl.nasa.gov";
    String publisher_name "Alexander G. Fore";
    String publisher_type "person";
    String references "10.1109/TGRS.2016.2601486, 10.1109/TGRS.2016.2600239, 10.1109/TGRS.2013.2266915, 10.1016/j.rse.2017.08.021";
    String sensor "SMAP";
    String source "SMAP L2B SSS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.875;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Gaussian-weighted map gridding of SMAP L2B SSS Product";
    String TB_CRID "R17000";
    String time_coverage_end "2018-12-31T12:00:00Z";
    String time_coverage_start "2018-01-01T12:00:00Z";
    String title "SMAP 0.25x0.25 deg grid averaged 8-day SSS/WSPD";
    Float64 Westernmost_Easting -179.875;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection 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. It makes 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.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.