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Dataset Title:  Sea Surface Height Anomalies and Geostrophic Currents, Delayed-Time, NOAA/
NESDIS/STAR - Daily, 2012-2019
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Institution:  NOAA/NESDIS Center for Satellite Applications and Research   (Dataset ID: noaa_sla_dt)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Data Access Form
 
Graph Type:  ?
X Axis:  ?
Y Axis:  ?
Color:  ?
 
Dimensions ?    Start ?    Stop ?
time (UTC) ?     specify just 1 value →
    |< - >|
< <
latitude (degrees_north) ?
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    -
< slider >
longitude (degrees_east) ?
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< slider >
 
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:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.325376e+9, 1.5725664e+9;
    String axis "T";
    String calendar "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";
    Float32 actual_range -89.875, 89.875;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 89.875;
    Float32 valid_min -89.875;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 0.125, 359.875;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 359.875;
    Float32 valid_min 0.125;
  }
  sla {
    Float64 _FillValue NaN;
    Float64 colorBarMaximum 2.0;
    Float64 colorBarMinimum -2.0;
    String comment "The sea level anomaly is referenced using the DTU15 mean sea surface height";
    String grid_mapping "crs";
    String ioos_category "Sea Level";
    String long_name "Sea Level Anomalies";
    Float64 missing_value NaN;
    String standard_name "sea_surface_height_above_sea_level";
    String units "m";
    Float64 valid_max 3.0838;
    Float64 valid_min -2.0555;
  }
  currents_U {
    Float64 _FillValue NaN;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String comment "The Mean Dynamic Topography (MDT) used in the derivation of the geostrophic currents is the MDT CNES/CLS 2013";
    String grid_mapping "crs";
    String ioos_category "Currents";
    String long_name "Absolute Geostrophic Velocity: Zonal Component";
    Float64 missing_value NaN;
    String standard_name "surface_geostrophic_eastward_sea_water_velocity";
    String units "m s-1";
    Float64 valid_max 4.9538;
    Float64 valid_min -4.9203;
  }
  currents_V {
    Float64 _FillValue NaN;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String comment "The Mean Dynamic Topography (MDT) used in the derivation of the geostrophic currents is the MDT CNES/CLS 2013";
    String grid_mapping "crs";
    String ioos_category "Currents";
    String long_name "Absolute Geostrophic Velocity: Meridian Component";
    Float64 missing_value NaN;
    String standard_name "surface_geostrophic_northward_sea_water_velocity";
    String units "m s-1";
    Float64 valid_max 4.852;
    Float64 valid_min -4.9386;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "Eric.Leuliette@noaa.gov";
    String creator_name "Eric.Leuliette@noaa.gov";
    String creator_url "https://www.nesdis.noaa.gov/";
    String cw_processing_algorithm "RADS 4.3.5";
    String cw_product_status "Experimental";
    String cw_satellite 
"Jason-2
CryoSat-2
SARAL
Jason-3
Sentinel-3A
Sentinel-3B";
    String date_created "2020-04-03T09:16:58.026420Z";
    String date_modified "2020-04-03T09:16:58.026420Z";
    Float64 Easternmost_Easting 359.875;
    Float64 geospatial_lat_max 89.875;
    Float64 geospatial_lat_min -89.875;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.875;
    Float64 geospatial_lon_min 0.125;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"Mon Apr 13 09:47:08 2020: ncatted -O -a valid_max,longitude,o,f,359.875 rads_global_dt_sla_20191101_001-0-360.nc
Mon Apr 13 09:47:08 2020: ncatted -O -a valid_min,longitude,o,f,0.125 rads_global_dt_sla_20191101_001-0-360.nc
Mon Apr 13 09:47:07 2020: ncap2 -O -s where(longitude<0) longitude=longitude+360 rads_global_dt_sla_20191101_001-0-360.nc rads_global_dt_sla_20191101_001-0-360.nc
Mon Apr 13 09:47:07 2020: ncks -O --msa_usr_rdr -d longitude,0.0,180.0 -d longitude,-180.0,0.0 rads_global_dt_sla_20191101_001.nc rads_global_dt_sla_20191101_001-0-360.nc
2024-04-24T16:09:24Z (local files)
2024-04-24T16:09:24Z https://oceanwatch.pifsc.noaa.gov/griddap/noaa_sla_dt.das";
    String infoUrl "https://www.nesdis.noaa.gov/";
    String institution "NOAA/NESDIS Center for Satellite Applications and Research";
    String keywords "above, absolute, altimetry, anomalies, anomaly, applications, center, circulation, component, currents, daily, data, day, earth, Earth Science > Oceans > Ocean Circulation > Ocean Currents, Earth Science > Oceans > Sea Surface Topography > Sea Surface Height, eastward, environmental, geostrophic, height, information, latitude, level, longitude, merged, meridian, national, nesdis, noaa, northward, ocean, oceans, research, satellite, science, sea, sea level, sea_surface_height_above_sea_level, seawater, service, sla, ssh, surface, surface_geostrophic_eastward_sea_water_velocity, surface_geostrophic_northward_sea_water_velocity, time, topography, ugos, velocity, vgos, 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 NCO "4.3.7";
    Int32 nco_openmp_thread_number 1;
    Float64 Northernmost_Northing 89.875;
    String source "Altimetry measurements";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.875;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "The NOAA Laboratory for Satellite Altimetry's (LSA) sea surface height team produces 0.25-degree longitude/latitude Level-3 sea level anomaly (SLA) daily datasets by applying optimal interpolation to along-track satellite observations over the global ocean from a constellation of radar altimeter missions. More information: https://coastwatch.noaa.gov/cw/satellite-data-products/sea-surface-height/optimal-interpolation-level-3-sea-level-anomalies-from-multiple-altimeter-missions.html";
    String time_coverage_end "2019-11-01T00:00:00Z";
    String time_coverage_start "2012-01-01T00:00:00Z";
    String title "Sea Surface Height Anomalies and Geostrophic Currents, Delayed-Time, NOAA/NESDIS/STAR - Daily, 2012-2019";
    Float64 Westernmost_Easting 0.125;
  }
}

 

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.

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[(2015-06-09T09:00:00Z)][(-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.


 
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