Make A Graph

Dataset Title:	Primary Productivity, Aqua MODIS, NPP, Global, 2003-present, EXPERIMENTAL (1 Day Composite), Lon0360
Institution:	NOAA NMFS SWFSC ERD (Dataset ID: erdMH1pp1day_Lon0360)
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 →

altitude (m)

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 1.0414224e+9, 1.7132688e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Centered Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float32 actual_range 0.0, 0.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.97916, 89.97918;
    String axis "Y";
    String coordsys "geographic";
    String ioos_category "Location";
    String long_name "Latitude";
    String point_spacing "even";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 0.020828, 359.9792;
    String axis "X";
    String coordsys "geographic";
    String ioos_category "Location";
    String long_name "Longitude";
    String point_spacing "even";
    String standard_name "longitude";
    String units "degrees_east";
  }
  productivity {
    Float32 _FillValue -99999.0;
    Float64 colorBarMaximum 2000.0;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "WhiteRedBlack";
    String coordsys "geographic";
    String ioos_category "Productivity";
    String long_name "Net Primary Productivity Of Carbon";
    Float32 missing_value -99999.0;
    String standard_name "net_primary_productivity_of_carbon";
    String units "mg C m-2 day-1";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.9.1,hdf5=1.12.2";
    String cdm_data_type "Grid";
    String contact "https://www.pfeg.noaa.gov/guest_book.html";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creation_date "2024-04-18";
    String creator_email "erd.data@noaa.gov";
    String creator_name "NOAA NMFS SWFSC ERD";
    String creator_type "institution";
    String creator_url "https://www.pfeg.noaa.gov";
    Float64 Easternmost_Easting 359.9792;
    Float64 geospatial_lat_max 89.97918;
    Float64 geospatial_lat_min -89.97916;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.9792;
    Float64 geospatial_lon_min 0.020828;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"erdMH1pp1day was created at NOAA NMFS SWFSC ERD (erd.data@noaa.gov) from data in the erdMH1chla1day, erdMH1sstd1day, and erdMH1par01day datasets.
2024-04-19T03:21:58Z (local files)
2024-04-19T03:21:58Z http://coastwatch.pfeg.noaa.gov/griddap/erdMH1pp1day_Lon0360.das";
    String infoUrl "https://coastwatch.pfeg.noaa.gov/infog/PPMH_las.html";
    String institution "NOAA NMFS SWFSC ERD";
    String keywords "altitude, aqua, biosphere, carbon, chemistry, chla, chlorophyll, chlorophyll-a, data, dynamics, Earth Science > Biosphere > Ecological Dynamics > Ecosystem Functions > Primary Production, Earth Science > Biosphere > Vegetation > Carbon, Earth Science > Oceans > Ocean Chemistry > Carbon, ecological, ecosystem, erd, experimental, functions, global, imaging, l3m, latitude, longitude, MHPProd, moderate, modis, national, net, net_primary_productivity_of_carbon, noaa, npp, ocean, oceans, orbiting, partnership, polar, polar-orbiting, primary, production, productivity, resolution, sea, spectroradiometer, sst, surface, temperature, time, vegetation";
    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 naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 89.97918;
    String publisher_email "erd.data@noaa.gov";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "institution";
    String publisher_url "https://www.pfeg.noaa.gov";
    String references "Behrenfield and Falkowski, L&O 1997";
    String rights "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, CoastWatch, 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 source_data "AQUA_MODIS.20240416.L3m.DAY.CHL.chlor_a.4km.NRT.nc, AQUA_MODIS.20240416.L3m.DAY.PAR.par.4km.NRT.nc, AQUA_MODIS.20240416.L3m.DAY.SSTMasked.sst.4km.NRT.nc";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.97916;
    String spatial_resolution "0.0417 degree";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "calculates vertically integrated primary productivity using the Behrenfield - Falkowski method and satellite-based measurements of Chlorophyll a, incident visible surface irradiance, and sea surface temperature.  see (Behrenfield and Falkowski, L&O 1997).";
    String testOutOfDate "now-4days";
    String time_coverage_end "2024-04-16T12:00:00Z";
    String time_coverage_start "2003-01-01T12:00:00Z";
    String title "Primary Productivity, Aqua MODIS, NPP, Global, 2003-present, EXPERIMENTAL (1 Day Composite), Lon0360";
    Float64 Westernmost_Easting 0.020828;
  }
}

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.