Make A Graph

Dataset Title:	TCHP_D26 Fields
Institution:	USDOC/NOAA/OAR/AOML/PHOD (Dataset ID: aomlTCHP)
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:	Ascending:

(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 {
    Int32 _ChunkSizes 524288;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.484568e+9, 1.7132688e+9;
    String axis "T";
    String calendar "Gregorian";
    String CoordinateAxisType "Time";
    String ioos_category "Time";
    String long_name "Reference Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    Int32 _ChunkSizes 721;
    String _CoordinateAxisType "Lat";
    Float32 actual_range -90.0, 90.0;
    String axis "Y";
    String CoordinateAxisType "Lat";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    Int32 _ChunkSizes 1441;
    String _CoordinateAxisType "Lon";
    Float32 actual_range -180.0, 180.0;
    String axis "X";
    String CoordinateAxisType "Lon";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Tropical_Cyclone_Heat_Potential {
    Int32 _ChunkSizes 1, 721, 1441;
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 237.07;
    Float64 colorBarMaximum 220.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Other";
    String long_name "Tropical Cyclone Heat Potential";
    String palette_info_variable "Uncertain";
    String standard_name "integral_of_sea_water_potential_temperature_wrt_depth_expressed_as_heat_content";
    String units "KJcm-2";
    String variable_info "To be Completed";
  }
  D26 {
    Int32 _ChunkSizes 1, 721, 1441;
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 237.07;
    Float64 colorBarMaximum 200.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Temperature";
    String long_name "Depth of the 26C isotherm";
    String palette_info_variable "Uncertain";
    String standard_name "depth_of_isosurface_of_sea_water_potential_temperature";
    String units "m";
    String variable_info "To be Completed";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment 
"Tropical Cyclone Heat Potential V2.1
 www.aoml.noaa.gov/phod/cyclone";
    String contact "Joaquin.Trinanes@noaa.gov";
    String Conventions "COARDS, CF-1.6";
    String creator_email "Joaquin.Trinanes@noaa.gov";
    String creator_name "Physical Oceanography Division at NOAA/AOML";
    String creator_url "http://www.aoml.noaa.gov/phod/cyclone/data/gl.html";
    String data_source "USDOC/NOAA/OAR/AOML/PHOD ATLANTIC OCEANWATCH";
    Float64 Easternmost_Easting 180.0;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -90.0;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 180.0;
    Float64 geospatial_lon_min -180.0;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-04-18T18:39:44Z https://cwcgom.aoml.noaa.gov/thredds/dodsC/TCHP/TCHP.nc
2024-04-18T18:39:44Z http://cwcgom.aoml.noaa.gov:8080/griddap/aomlTCHP.das";
    String history_of_appended_files 
"Thu Apr 18 07:15:07 2024: Appended file kkd.nc had following \"history\" attribute:
Thu Apr 18 07:15:07 2024: ncrename -v z,D26 kkd.nc
Thu Apr 18 07:15:07 2024: ncatted -a standard_name,z,c,c,depth_of_isosurface_of_sea_water_potential_temperature kkd.nc
Thu Apr 18 07:15:07 2024: ncatted -a ioos_category,z,c,c,Temperature kkd.nc
Thu Apr 18 07:15:07 2024: ncatted -a variable_info,z,c,c,Depth of the 26deg isotherm kkd.nc
Thu Apr 18 07:15:07 2024: ncatted -a coordsys,z,c,c,geographic kkd.nc
Thu Apr 18 07:15:07 2024: ncatted -a units,z,c,c,m kkd.nc
Thu Apr 18 07:15:07 2024: ncatted -a long_name,z,m,c,D26 kkd.nc
Thu Apr 18 07:15:07 2024: ncap2 -s lon=float(lon);lat=float(lat) kk.grd d26.grd
grdmath 20240415.grd 0 AND landmask.grd NAN = kk.grd";
    String infoUrl "http://www.aoml.noaa.gov/phod/cyclone/data/gl.html";
    String institution "USDOC/NOAA/OAR/AOML/PHOD";
    String keywords "altimeter, heat content, hurricane, hurricane intensification, SST, temperature";
    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.";
    Int32 nco_openmp_thread_number 1;
    Int32 node_offset 0;
    Float64 Northernmost_Northing 90.0;
    String origin "USDOC/NOAA/OAR/AOML/PHOD ATLANTIC OCEANWATCH";
    String source_data "Altimeter SHA+MW SST";
    String sourceUrl "https://cwcgom.aoml.noaa.gov/thredds/dodsC/TCHP/TCHP.nc";
    Float64 Southernmost_Northing -90.0;
    String spatial_resolution "0.25 degree";
    String standard_name_vocabulary "CF-1.6";
    String summary "Tropical Cyclone Heat Potential";
    Float64 temporal_extent 86400.0;
    String temporal_extent_unit "seconds";
    String time_coverage_end "2024-04-16T12:00:00Z";
    String time_coverage_start "2017-01-16T12:00:00Z";
    String title "TCHP_D26 Fields";
    Float64 Westernmost_Easting -180.0;
  }
}

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.