Make A Graph

Dataset Title:	Cascade \| NiN \| Wave Period
Institution:	UNIZG (Dataset ID: NiN_3560_bf8e_8d6c)
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:
(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 1.6752096e+9, 1.675296e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    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 44.22902861673904, 44.48945571689895;
    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 14.790213745648925, 15.232939815920764;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  vtza {
    Float64 _FillValue NaN;
    Float64 colorBarMaximum 1.5;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Mean wave period";
    Float64 missing_value NaN;
    String standard_name "sea_surface_swell_wave_period";
    String units "s";
  }
  NC_GLOBAL {
    String CDI "Climate Data Interface version 1.9.9rc1 (https://mpimet.mpg.de/cdi)";
    String cdm_data_type "Grid";
    String CDO "Climate Data Operators version 1.9.9rc1 (https://mpimet.mpg.de/cdo)";
    String Conventions "netCDF-4 classic model, COARDS, CF-1.6, ACDD-1.3";
    Float64 Easternmost_Easting 15.232939815920764;
    String GDAL "GDAL 3.6.2, released 2023/01/02";
    String GDAL_NETCDF_DIM_EXTRA "{time}";
    Int32 GDAL_NETCDF_DIM_time_DEF 25, 6;
    Int32 GDAL_NETCDF_DIM_time_VALUES 1078944, 1078945, 1078946, 1078947, 1078948, 1078949, 1078950, 1078951, 1078952, 1078953, 1078954, 1078955, 1078956, 1078957, 1078958, 1078959, 1078960, 1078961, 1078962, 1078963, 1078964, 1078965, 1078966, 1078967, 1078968;
    Float64 geospatial_lat_max 44.48945571689895;
    Float64 geospatial_lat_min 44.22902861673904;
    Float64 geospatial_lat_resolution 5.661458699128452e-4;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 15.232939815920764;
    Float64 geospatial_lon_min 14.790213745648925;
    Float64 geospatial_lon_resolution 5.66145869912837e-4;
    String geospatial_lon_units "degrees_east";
    String grid_mapping_crs_wkt "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AXIS[\"Latitude\",NORTH],AXIS[\"Longitude\",EAST],AUTHORITY[\"EPSG\",\"4326\"]]";
    String grid_mapping_GeoTransform "14.78993067271397 0.0005661458699128379 0 44.48973878983391 0 -0.0005661458699128379";
    Float64 grid_mapping_inverse_flattening 298.257223563;
    String grid_mapping_long_name "CRS definition";
    Float64 grid_mapping_longitude_of_prime_meridian 0.0;
    String grid_mapping_name "latitude_longitude";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String grid_mapping_spatial_ref "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AXIS[\"Latitude\",NORTH],AXIS[\"Longitude\",EAST],AUTHORITY[\"EPSG\",\"4326\"]]";
    String history 
"Thu May 25 12:36:45 2023: cdo settaxis,2023-02-01,00:00,1hour band.nc wave-period.nc
Thu May 25 12:36:45 2023: ncatted -a units,time,o,c,hours since 1970-01-01 band.nc
Thu May 25 12:36:43 2023: cdo cat band1.nc band2.nc band3.nc band4.nc band5.nc band6.nc band7.nc band8.nc band9.nc band10.nc band11.nc band12.nc band13.nc band14.nc band15.nc band16.nc band17.nc band18.nc band19.nc band20.nc band21.nc band22.nc band23.nc band24.nc band25.nc band.nc
Thu May 25 12:36:42 2023: ncrename -v Band1,vtza band1.nc
Thu May 25 12:36:42 2023: ncks -v Band1 out_wave_period.nc band1.nc
Tue Mar 21 14:59:30 2023: GDAL Create( C:/Users/db/Desktop/out_wave_period.nc, ... )
2024-09-19T15:46:38Z (local files)
2024-09-19T15:46:38Z https://erddap.cmcc-opa.eu/griddap/NiN_3560_bf8e_8d6c.das";
    String infoUrl "unizg.hr";
    String institution "UNIZG";
    String keywords "data, earth, Earth Science > Oceans > Ocean Waves > Swells, Earth Science > Oceans > Ocean Waves > Wave Period, local, mean, ocean, oceans, period, science, sea, sea_surface_swell_wave_period, source, surface, surface waves, swell, swells, time, vtza, wave, waves";
    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 4.9.1 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Float64 Northernmost_Northing 44.48945571689895;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 44.22902861673904;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Cascade | NiN | Wave Period";
    String time_coverage_end "2023-02-02T00:00:00Z";
    String time_coverage_start "2023-02-01T00:00:00Z";
    String title "Cascade | NiN | Wave Period";
    Float64 Westernmost_Easting 14.790213745648925;
  }
}

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.