Data Access Form

Dataset Title:	Daily estimated MUR SST v4.1 Frontal edges, x_gradient, y_gradient and gradient magnitude, US West Coast, 2002-present, Lon0360
Institution:	NOAA NMFS SWFSC ERD (Dataset ID: erdMurFront41USWest_Lon0360)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	8172	1 day 0h 6m 10s (uneven)

altitude (m)	1	(just one value)

latitude (degrees_north)	2901	0.01 (even)

longitude (degrees_east)	3001	0.01 (even)

Grid Variables (which always also download all of the dimension variables)

magnitude_gradient (Magnitude of SST Gradient)

edges (Frontal Edge)

x_gradient (East-West Gradient of SST)

y_gradient (North-South Gradient of SST)

File type: (more information)

(Documentation / Bypass this form)

(Please be patient. It may take a while to get the data.)

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.0228896e+9, 1.731888e+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";
  }
  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 22.0, 51.0;
    String axis "Y";
    String grid_mapping "Equidistant Cylindrical";
    String ioos_category "Location";
    String long_name "Latitude";
    String reference_datum "geographical coordinates, WGS84 projection";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 51.0;
    Float32 valid_min 22.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 225.0, 255.0;
    String axis "X";
    String grid_mapping "Equidistant Cylindrical";
    String ioos_category "Location";
    String long_name "Longitude";
    String reference_datum "geographical coordinates, WGS84 projection";
    String standard_name "longitude";
    String units "degrees_east";
  }
  magnitude_gradient {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "KT_amp";
    String grid_mapping "LatLon_Projection";
    String ioos_category "Temperature";
    String long_name "Magnitude of SST Gradient";
    Float32 missing_value NaN;
  }
  edges {
    Int16 _FillValue 32767;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "KT_amp";
    String grid_mapping "LatLon_Projection";
    String ioos_category "Temperature";
    String long_name "Frontal Edge";
    Int16 missing_value 32767;
  }
  x_gradient {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum -1.0;
    String colorBarPalette "KT_balance";
    String grid_mapping "LatLon_Projection";
    String ioos_category "Temperature";
    String long_name "East-West Gradient of SST";
    Float32 missing_value NaN;
  }
  y_gradient {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum -1.0;
    String colorBarPalette "KT_balance";
    String grid_mapping "LatLon_Projection";
    String ioos_category "Temperature";
    String long_name "North-South Gradient of SST";
    Float32 missing_value NaN;
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.9.1,hdf5=1.12.2";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    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 255.0;
    Float64 geospatial_lat_max 51.0;
    Float64 geospatial_lat_min 22.0;
    Float64 geospatial_lat_resolution 0.01;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 255.0;
    Float64 geospatial_lon_min 225.0;
    Float64 geospatial_lon_resolution 0.01;
    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 
"created from MUR SST file 20241118090000-JPL-L4_GHRSST-SSTfnd-MUR-GLOB-v02.0-fv04.1.ncusing python scikit-image canny algorithm, sigma = 10, thresholds of 0.8, 0.9 and OpenCV findContours function with minimum length 20
2024-11-21T11:36:36Z (local files)
2024-11-21T11:36:36Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdMurFront41USWest_Lon0360.das";
    String infoUrl "https://www.pfeg.noaa.gov";
    String institution "NOAA NMFS SWFSC ERD";
    String keywords "altitude, daily, data, day, east, east-west, edge, edges, erd, estimated, frontal, gradient, high, magnitude, magnitude_gradient, multi, multi-scale, mur, noaa, north, north-south, resolution, scale, sea, south, sst, surface, temperature, time, ultra, ultra-high, west, x_gradient, y_gradient";
    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.";
    Float64 Northernmost_Northing 51.0;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 22.0;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Front Edges estimated from daily Multi-scale Ultra-high Resolution (MUR) Sea Surface Temperature (SST) v4.1 files using the Python scikit-image canny algorithm with sigma = 10., and threshold values of .8 and .9, as well as the OpenCV algorithm findContours with a minimum length of 20. The SST x-gradient, y-gradient and gradient magnitude are also included";
    String testOutOfDate "now-4days";
    String time_coverage_end "2024-11-18T00:00:00Z";
    String time_coverage_start "2002-06-01T00:00:00Z";
    String title "Daily estimated MUR SST v4.1 Frontal edges, x_gradient, y_gradient and gradient magnitude, US West Coast, 2002-present, Lon0360";
    Float64 Westernmost_Easting 225.0;
  }
}

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.