Make A Graph

Dataset Title:	MSI: AREA1 L2
Institution:	Atlantic OceanWatch (Dataset ID: AREA1_L2_798d_a1b3_3810)
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:
(Documentation / Bypass this form

)

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 1.468368e+9, 1.6288128e+9;
    String axis "T";
    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 48.3801, 48.4;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_max 48.4;
    Float64 valid_min 48.3801;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -124.751, -124.5811;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max -124.5811;
    Float64 valid_min -124.751;
  }
  B1 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B1";
    Float32 radiation_wavelength 443.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B2 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B2";
    Float32 radiation_wavelength 490.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B3 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B3";
    Float32 radiation_wavelength 560.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B4 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B4";
    Float32 radiation_wavelength 665.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B5 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B5";
    Float32 radiation_wavelength 705.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B6 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B6";
    Float32 radiation_wavelength 740.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B7 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B7";
    Float32 radiation_wavelength 783.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B8 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B8";
    Float32 radiation_wavelength 842.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B8A {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B8A";
    Float32 radiation_wavelength 865.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B9 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B9";
    Float32 radiation_wavelength 945.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B11 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B11";
    Float32 radiation_wavelength 1610.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  B12 {
    Float32 _FillValue NaN;
    String ioos_category "Optical Properties";
    String long_name "Reflectance in band B12";
    Float32 radiation_wavelength 2190.0;
    String radiation_wavelength_unit "nm";
    String units "dl";
  }
  pixel_classif_flags {
    Int32 _FillValue 0;
    Float64 colorBarMaximum 1500000.0;
    Float64 colorBarMinimum 0.0;
    Int32 flag_masks 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576;
    String flag_meanings "IDEPIX_INVALID IDEPIX_CLOUD IDEPIX_CLOUD_AMBIGUOUS IDEPIX_CLOUD_SURE IDEPIX_CLOUD_BUFFER IDEPIX_CLOUD_SHADOW IDEPIX_SNOW_ICE IDEPIX_BRIGHT IDEPIX_WHITE IDEPIX_COASTLINE IDEPIX_LAND IDEPIX_CIRRUS_SURE IDEPIX_CIRRUS_AMBIGUOUS IDEPIX_CLEAR_LAND IDEPIX_CLEAR_WATER IDEPIX_WATER IDEPIX_BRIGHTWHITE IDEPIX_VEG_RISK IDEPIX_MOUNTAIN_SHADOW IDEPIX_POTENTIAL_SHADOW IDEPIX_CLUSTERED_CLOUD_SHADOW";
    String ioos_category "Quality";
    String long_name "Pixel Classif Flags";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.6.3,hdf5=1.10.2";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    Float64 Easternmost_Easting -124.5811;
    Float64 geospatial_lat_max 48.4;
    Float64 geospatial_lat_min 48.3801;
    Float64 geospatial_lat_resolution 9.999999999999903e-5;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -124.5811;
    Float64 geospatial_lon_min -124.751;
    Float64 geospatial_lon_resolution 9.999999999999906e-5;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-04-30T15:09:50Z (local files)
2024-04-30T15:09:50Z https://oceanwatch.aoml.noaa.gov/griddap/AREA1_L2_798d_a1b3_3810.das";
    String infoUrl "???";
    String institution "Atlantic OceanWatch";
    String keywords "b11, b12, b8a, band, classif, data, flags, local, optical, optical properties, pixel, pixel_classif_flags, properties, quality, reflectance, source, time";
    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 48.4;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 48.3801;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "MSI: AREA1 L2";
    String TileSize "512:512";
    String time_coverage_end "2021-08-13T00:00:00Z";
    String time_coverage_start "2016-07-13T00:00:00Z";
    String title "MSI: AREA1 L2";
    Float64 Westernmost_Easting -124.751;
  }
}

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.