Make A Graph

Dataset Title:	MODIS Aqua rolling 8-day composite at 9KM
Institution:	NASA (Dataset ID: Aqua_rolling8day_NASA)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

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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 {
    Int32 _ChunkSizes 1048576;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.0257552e+9, 1.5777684e+9;
    String axis "T";
    String cell_methods "time: mean";
    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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.95833587646484, 89.95833587646484;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -179.9583282470703, 179.95835876464844;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  chl_ocx {
    Int32 _ChunkSizes 1, 720, 1440;
    Float32 _FillValue -999.0;
    String cell_methods "time: mean";
    String ioos_category "Unknown";
    String long_name "Chl Ocx";
    String units "mg m^-3";
  }
  sst {
    Int32 _ChunkSizes 1, 720, 1440;
    Float32 _FillValue -999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Temperature";
    String long_name "Sea Surface Temperature";
    String standard_name "sea_surface_temperature";
    String units "degree_C";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "NASA";
    String creator_type "institution";
    String creator_url "https://www.nasa.gov/";
    Float64 Easternmost_Easting 179.95835876464844;
    Float64 geospatial_lat_max 89.95833587646484;
    Float64 geospatial_lat_min -89.95833587646484;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.95835876464844;
    Float64 geospatial_lon_min -179.9583282470703;
    String geospatial_lon_units "degrees_east";
    String history 
"Tue May  6 13:39:18 2025: ncks -v sst,chl_ocx /lustre/scratch/orb/aqua/9km/8day/aqua_9km_8day_2010.nc4 2010.extracted.nc4
Thu May 12 07:48:10 2022: ncrcat A2009359_2010001.nc4 A2009360_2010002.nc4 A2009361_2010003.nc4 A2009362_2010004.nc4 A2009363_2010005.nc4 A2009364_2010006.nc4 A2009365_2010007.nc4 A2010001_2010008.nc4 A2010002_2010009.nc4 A2010003_2010010.nc4 A2010004_2010011.nc4 A2010005_2010012.nc4 A2010006_2010013.nc4 A2010007_2010014.nc4 A2010008_2010015.nc4 A2010009_2010016.nc4 A2010010_2010017.nc4 A2010011_2010018.nc4 A2010012_2010019.nc4 A2010013_2010020.nc4 A2010014_2010021.nc4 A2010015_2010022.nc4 A2010016_2010023.nc4 A2010017_2010024.nc4 A2010018_2010025.nc4 A2010019_2010026.nc4 A2010020_2010027.nc4 A2010021_2010028.nc4 A2010022_2010029.nc4 A2010023_2010030.nc4 A2010024_2010031.nc4 A2010025_2010032.nc4 A2010026_2010033.nc4 A2010027_2010034.nc4 A2010028_2010035.nc4 A2010029_2010036.nc4 A2010030_2010037.nc4 A2010031_2010038.nc4 A2010032_2010039.nc4 A2010033_2010040.nc4 A2010034_2010041.nc4 A2010035_2010042.nc4 A2010036_2010043.nc4 A2010037_2010044.nc4 A2010038_2010045.nc4 A2010039_2010046.nc4 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A2010275_2010282.nc4 A2010276_2010283.nc4 A2010277_2010284.nc4 A2010278_2010285.nc4 A2010279_2010286.nc4 A2010280_2010287.nc4 A2010281_2010288.nc4 A2010282_2010289.nc4 A2010283_2010290.nc4 A2010284_2010291.nc4 A2010285_2010292.nc4 A2010286_2010293.nc4 A2010287_2010294.nc4 A2010288_2010295.nc4 A2010289_2010296.nc4 A2010290_2010297.nc4 A2010291_2010298.nc4 A2010292_2010299.nc4 A2010293_2010300.nc4 A2010294_2010301.nc4 A2010295_2010302.nc4 A2010296_2010303.nc4 A2010297_2010304.nc4 A2010298_2010305.nc4 A2010299_2010306.nc4 A2010300_2010307.nc4 A2010301_2010308.nc4 A2010302_2010309.nc4 A2010303_2010310.nc4 A2010304_2010311.nc4 A2010305_2010312.nc4 A2010306_2010313.nc4 A2010307_2010314.nc4 A2010308_2010315.nc4 A2010309_2010316.nc4 A2010310_2010317.nc4 A2010311_2010318.nc4 A2010312_2010319.nc4 A2010313_2010320.nc4 A2010314_2010321.nc4 A2010315_2010322.nc4 A2010316_2010323.nc4 A2010317_2010324.nc4 A2010318_2010325.nc4 A2010319_2010326.nc4 A2010320_2010327.nc4 A2010321_2010328.nc4 A2010322_2010329.nc4 A2010323_2010330.nc4 A2010324_2010331.nc4 A2010325_2010332.nc4 A2010326_2010333.nc4 A2010327_2010334.nc4 A2010328_2010335.nc4 A2010329_2010336.nc4 A2010330_2010337.nc4 A2010331_2010338.nc4 A2010332_2010339.nc4 A2010333_2010340.nc4 A2010334_2010341.nc4 A2010335_2010342.nc4 A2010336_2010343.nc4 A2010337_2010344.nc4 A2010338_2010345.nc4 A2010339_2010346.nc4 A2010340_2010347.nc4 A2010341_2010348.nc4 A2010342_2010349.nc4 A2010343_2010350.nc4 A2010344_2010351.nc4 A2010345_2010352.nc4 A2010346_2010353.nc4 A2010347_2010354.nc4 A2010348_2010355.nc4 A2010349_2010356.nc4 A2010350_2010357.nc4 A2010351_2010358.nc4 A2010352_2010359.nc4 A2010353_2010360.nc4 A2010354_2010361.nc4 A2010355_2010362.nc4 A2010356_2010363.nc4 A2010357_2010364.nc4 A2010358_2010365.nc4 /home/1097/workdir/seawifs_concat/aqua_8day.2010.concat.nc4
Wed May 11 10:18:06 2022: /home/1097/nco/nco-5.0.2/src/nco/.libs/lt-ncra 2010/A2010001.nc4 2009/A2009365.nc4 2009/A2009364.nc4 2009/A2009363.nc4 2009/A2009362.nc4 2009/A2009361.nc4 2009/A2009360.nc4 2009/A2009359.nc4 ../8day/2010/A2009359_2010001.nc4
2025-05-16T13:57:56Z (local files)
2025-05-16T13:57:56Z http://robots.ceoe.udel.edu/griddap/Aqua_rolling8day_NASA.das";
    String infoUrl "https://www.nasa.gov/";
    String institution "NASA";
    String keywords "chl, chl_ocx, chlorophyll, data, earth, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, local, nasa, ocean, oceans, ocx, science, sea, sea_surface_temperature, source, sst, surface, temperature, time";
    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 NCO "netCDF Operators version 4.7.6 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Float64 Northernmost_Northing 89.95833587646484;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.95833587646484;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "MODIS Aqua rolling 8-day composite at 9KM";
    String time_coverage_end "2019-12-31T05:00:00Z";
    String time_coverage_start "2002-07-04T04:00:00Z";
    String title "MODIS Aqua rolling 8-day composite at 9KM";
    Float64 Westernmost_Easting -179.9583282470703;
  }
}

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/jplMURSST.htmlTable?analysed_sst[(2015-06-09T09:00:00Z)][(-89.9945):1000:(89.9945)][(-179.995):1000:(179.995)]
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.