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Dataset Title:  Alaska Region Digital Elevation Model (ARDEM) v2.0 Subscribe RSS
Institution:  Institute of Marine Sciences, University of Alaska Fairbanks   (Dataset ID: ARDEM)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      4201    0.008333333 (even)
  < slider >
 longitude (degrees_east) ?      6601    0.01666667 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 z (model Digital Elevation Model (DEM) depth/height, m) ?

File type: (more info)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.385856e+9, 1.385856e+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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 45.0, 80.0;
    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 130.0, 240.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  z {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "OceanDepth";
    String ioos_category "Sea Level";
    String long_name "model Digital Elevation Model (DEM) depth/height";
    String standard_name "sea_floor_depth_below_sea_surface";
    String units "m";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.dataset.conv.CF1Convention";
    String acknowledgement "We gratefully acknowledge the numerous organizations and individuals who have helped us assemble this expansive soundings dataset, including: National Oceanic and Atmospheric Administration (NOAA), the Canadian Hydrographic Service (CHS), NOAA's National Ocean Service (NOS) and their Hydrographic Survey Trackline Database, the National Geophysical Data Center (NGDC) and the creators of the GLOBE land elevations DEM, the Smith-Sandwell v14.1 DEM that elegantly includes ship sounding datapoints, the principal investigators on board research vessels who have made their data available to us, the Hawaii Mapping Research Group, the University of New Hampshire Center for Coastal and Ocean Mapping, the Lamont-Doherty Marine Geoscience Data System, Martin Jakobsson and the IBCAO grid, and the many individuals who have pointed us to additional data and supported our data assembly efforts. We thank the developers of the GMT toolkit for their software package that enables us to efficiently assemble this grid. Funding for this project was provided by the North Pacific Research Board (NPRB) and the Oil Spill Research Institute (OSRI).";
    String cdm_data_type "Grid";
    String comment "We would like to hear about uses that you apply this dataset to: this information will help us secure funding for future improvements. Valuable feedback includes both success stories and identified problems with the grid.";
    String Conventions "CF-1.6 ACDD-1.1, COARDS, Unidata Dataset Discovery v1.0";
    String creator_email "sldanielson@alaska.edu";
    String creator_name "Seth Danielson";
    Float64 Easternmost_Easting 240.0;
    Float64 geospatial_lat_max 80.0;
    Float64 geospatial_lat_min 45.0;
    Float64 geospatial_lat_resolution 0.008333333333333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 240.0;
    Float64 geospatial_lon_min 130.0;
    Float64 geospatial_lon_resolution 0.016666666666666666;
    String geospatial_lon_units "degrees_east";
    String GMT_version "5.1.0 (r12452) [64-bit]";
    String history 
"grdblend ARDEM.grd ibcao_subsetA.grd ibcao_subsetB.grd ibcao_subsetC.grd ibcao_subsetD.grd ibcao_subsetE.grd -Co -GARDEMblend.grd -Rg130/240/45/80 -I60s/30s
2018-05-25T09:17:20Z (local files)
2018-05-25T09:17:20Z http://erddap.axiomdatascience.com/erddap/griddap/ARDEM.das";
    String infoUrl "???";
    String institution "Institute of Marine Sciences, University of Alaska Fairbanks";
    String keywords "alaska, ardem, bathymetry, below, dem, depth, depth/height, digital, Earth Science > Land Surface > Topography > Topographical Relief, Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry, Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth, elevation, fairbanks, floor, height, institute, land, level, marine, model, oceans, region, relief, sciences, sea, sea level, sea_floor_depth_below_sea_surface, seafloor, seawater, surface, topographical, topography, university, v2.0, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "This Digital Elevation Model (DEM) is freely available and distributable but may not be repackaged for commercial purposes. USE THIS DEM AT YOUR OWN RISK. This product is not for navigational purposes. This is a research-grade product in development and we expect that there are regions that do not well reflect actual bathymetry and topography. See the Land Elevations and Citations sections below for additional use and copyright information.";
    String Metadata_Conventions "CF-1.6 ACDD-1.1, COARDS, Unidata Dataset Discovery v1.0";
    Float64 Northernmost_Northing 80.0;
    String source "ARDEM is based on ship sounding datapoints, including Electronic Navigation Chart (ENC) point soundings, research vessel underway soundings, multibeam swath mapping datasets and digitized point soundings from paper nautical charts.";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 45.0;
    String standard_name_vocabulary "cf-conventions v26";
    String summary "We have created a bathymetric digital elevation model (DEM) with nominal 1-km grid spacing over the domain 45ºN-80ºN and 130ºE-120ºW. With the exception of a portion of the outer Siberian shelves, the DEM is based solely on ship sounding datapoints, including Electronic Navigation Chart (ENC) point soundings, research vessel underway soundings, multibeam swath mapping datasets and digitized point soundings from paper nautical charts. Please note that in some regions the 1-km coverage is resolved and in many regions 1 km is not resolved. Land Elevations: In order to assist those who have interest in employing a combined bathymetric-topographic DEM, we have spliced the ocean DEM grid with land elevations from the Global Land One-kilometer Base Elevation (GLOBE) 1-km open source DEM. Because the GLOBE DEM is based on a pixel registration grid, we have employed a bilinear interpolation to re-register to gridline nodes. Please see the GLOBE web site for detailed documentation, use policies and copyright information. The GLOBE DEM use citation is listed below. Bathymetry in the Arctic: The ARDEMv2.0 grid employs depths from the International Bathymetric Chart of the Arctic Ocean (IBCAO) for the region within the polygon bounded by the following points: 130ºE/76.8ºN, 154ºE/76.8ºN, 154ºE/74ºN, 172ºE/74ºN, 172ºE/72ºN, 186ºE/72ºN, 186ºE/71.5ºN, 198ºE/71.5ºN, 198ºE/68ºN, 240ºE/68ºN, 240ºE/80ºN, 130ºE/80ºN. This region encompasses the northern Chukchi Sea, the Beaufort Sea, and the northern East Siberian Sea. See the IBCAO reference information below. Grid Details: Data is gridded to a regular 30 second latitude by 60 second longitude grid (nominally ~ 1 km), with gridline node registration. Software to to read, reproject, subsample and plot this dataset is freely available at the Generic Mapping Tools (GMT) website. ";
    String time_coverage_end "2013-12-01T00:00:00Z";
    String time_coverage_start "2013-12-01T00:00:00Z";
    String title "Alaska Region Digital Elevation Model (ARDEM) v2.0";
    Float64 Westernmost_Easting 130.0;
  }
}

 

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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[(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.


 
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