Make A Graph

Dataset Title:	The California ROMS model extends from just north of the CA-Oregon border so ...
Institution:	Remote Sensing Solutions (Dataset ID: CA_DAS)
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 →

depth (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:

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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 {
    UInt32 _ChunkSizes 1;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3647852e+9, 1.503846e+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";
  }
  depth {
    UInt32 _ChunkSizes 12;
    String _CoordinateAxesType "Height";
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 actual_range 0.0, 400.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  latitude {
    UInt32 _ChunkSizes 391;
    String _CoordinateAxisType "Lat";
    Float32 actual_range 31.3, 43.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    UInt32 _ChunkSizes 351;
    String _CoordinateAxisType "Lon";
    Float32 actual_range -127.5, -117.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  temp {
    UInt32 _ChunkSizes 1, 3, 95, 85;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Temperature";
    String long_name "Temperature";
    String standard_name "sea_water_temperature";
    String units "degree_Celsius";
  }
  salt {
    UInt32 _ChunkSizes 1, 3, 95, 85;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String ioos_category "Salinity";
    String long_name "Salinity";
    String standard_name "sea_water_salinity";
    String units "1e-3";
  }
  u {
    UInt32 _ChunkSizes 1, 3, 95, 85;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String ioos_category "Currents";
    String long_name "Zonal Current";
    String standard_name "eastward_sea_water_velocity";
    String units "m.s-1";
  }
  v {
    UInt32 _ChunkSizes 1, 3, 95, 85;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String ioos_category "Currents";
    String long_name "Meridional Current";
    String standard_name "northward_sea_water_velocity";
    String units "m.s-1";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.internal.dataset.conv.DefaultConventions";
    String acknowledgment "This model is operated by UCLA and Remote Sensing Solutions Inc.";
    String cdm_data_type "Grid";
    String comment "The ROMS model is described in detail at: https://www.myroms.org/ For differences between ROMS models, see Shchepetkin, A.F.,and J.C. McWilliams, 2009: Correction and Commentary for `Ocean Forecasting in Terrain-Following Coordinates: Formulation and Skill Assessment of the Regional Ocean Modeling System' by Haidvogel et al., J. Comp. Phys. 227, pp. 3595-3624. J. Comp. Phys., 228, 8985-9000.";
    String Conventions "Unidata Dataset Discovery v1.0, COARDS, CF-1.6";
    String creator_email "ychao@remotesensingsolutions.com";
    String creator_name "Yi Chao";
    String creator_url "http://www.remotesensingsolutions.com/about/bio_Chao.php";
    String date_issued "2010-09-17";
    Float64 Easternmost_Easting -117.0;
    Float64 geospatial_lat_max 43.0;
    Float64 geospatial_lat_min 31.3;
    Float64 geospatial_lat_resolution 0.03;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -117.0;
    Float64 geospatial_lon_min -127.5;
    Float64 geospatial_lon_resolution 0.03;
    String geospatial_lon_units "degrees_east";
    String history 
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/mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040715.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040721.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040803.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040809.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040821.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040909.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013040921.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041009.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041103.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041109.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041209.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041309.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041321.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041403.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041409.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041415.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041421.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041503.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041509.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041609.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041709.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041809.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013041909.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042009.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042109.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042209.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042215.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042221.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042303.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042309.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042315.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042321.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042403.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042409.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042415.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042421.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042503.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042509.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042515.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042521.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042603.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042609.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042615.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042621.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042703.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042709.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042715.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042721.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042803.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042809.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042815.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042821.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042903.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042909.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042915.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013042921.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013043015.nc /mnt/gluster/data/netCDF/ca_das/processed/ca_subCA_das_2013043021.nc
Mon Apr  1 02:24:27 2013: ncatted -O -aunits,time,o,c,days since 2009-01-01 00:00:00 ca_subCA_das_2013040103.nc
Mon Apr  1 02:24:27 2013: ncatted -O -atitle,global,o,c,CA-2013040103 ca_subCA_das_2013040103.nc
2023-03-31T10:11:20Z (local files)
2023-03-31T10:11:20Z http://erddap.axiomdatascience.com/griddap/CA_DAS.das";
    String infoUrl "http://www.remotesensingsolutions.com/about/bio_Chao.php";
    String institution "Remote Sensing Solutions";
    String keywords "border, ca-oregon, california, circulation, current, currents, density, Earth Science > Oceans > Ocean Circulation > Ocean Currents, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Salinity, eastward, eastward_sea_water_velocity, extends, just, meridional, model, modeling, north, northward, northward_sea_water_velocity, ocean, oceans, oregon, regional, regional ocean model, remote, roms, salinity, sea, sea_water_salinity, sea_water_temperature, seawater, sensing, solutions, system, temperature, velocity, water, zonal";
    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 Metadata_Conventions "Unidata Dataset Discovery v1.0, COARDS, CF-1.6";
    String metadata_link "https://www.cencoos.org/sections/models/roms/ca/";
    Int32 nco_openmp_thread_number 1;
    Float64 Northernmost_Northing 43.0;
    String publisher_name "Central and Northern California Ocean Observing System";
    String publisher_url "https://www.cencoos.org";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 31.3;
    String standard_name_vocabulary "CF-Standard Names 26";
    String summary "The California ROMS model extends from just north of the CA-Oregon border south to Mexico and has a resolution of 3 km. Near-real-time forecasts (72 hr) and nowcasts are available for sea surface height, water temperature, salinity, and currents. This model is operated by UCLA and Remote Sensing Solutions.";
    String time_coverage_end "2017-08-27T15:00:00Z";
    String time_coverage_start "2013-04-01T03:00:00Z";
    String title "The California ROMS model extends from just north of the CA-Oregon border so ...";
    Float64 Westernmost_Easting -127.5;
  }
}

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.