Make A Graph

Dataset Title:	Topography, SRTM30+ Version 1.0, 30 arc second, Global
Institution:	Scripps (Dataset ID: usgsCeSrtm30v1)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
Color Bar: Continuity: Scale:
Min: Max: N Sections:
Draw the land mask:

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

Optional:
Then set the File Type: and

or view the URL:
(Documentation / Bypass this form

) (File Type information)

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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 Slide Sorter to build a personal web page that displays graphs of the latest data, each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 90.0, -89.99166666666667;
    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 -180.0, 179.99166666666667;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  topo {
    Int16 _FillValue -9999;
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "Topography";
    String grid_mapping "GDAL_Geographics";
    String ioos_category "Location";
    String long_name "Topography";
    String standard_name "altitude";
    String units "meters";
  }
  NC_GLOBAL {
    String AREA_OR_POINT "Area";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, Unidata Dataset Discovery v1.0";
    String creator_email "jjbecker@ucsd.edu, dsandwell@ucsd.edu";
    Float64 Easternmost_Easting 179.99166666666667;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -89.99166666666667;
    Float64 geospatial_lat_resolution 0.008333333333333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.99166666666667;
    Float64 geospatial_lon_min -180.0;
    Float64 geospatial_lon_resolution 0.008333333333333333;
    String geospatial_lon_units "degrees_east";
    String history 
"Thu Apr 24 16:06:31 2008: ncrename srtm30plus_v1.nc -d x,lon -d y,lat
Fri Apr 18 07:21:42 2008: ncrename -v Band1,topo srtm30plus_v1.nc foo.nc
2013-05-22T05:47:20Z http://geoport.whoi.edu/thredds/dodsC/bathy/srtm30plus_v1.nc
2013-05-22T05:47:20Z http://coastwatch.pfeg.noaa.gov/griddap/usgsCeSrtm30v1.das";
    String infoUrl "http://topex.ucsd.edu/WWW_html/srtm30_plus.html";
    String institution "Scripps";
    String keywords 
"Oceans > Bathymetry/Seafloor Topography > Bathymetry,
altitude, arc, atmosphere, global, height, scripps, second, srtm30+, station,
topography, version";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"David T. Sandwell, Walter H. F. Smith, and Joseph J. Becker Copyright 2008.
The Regents of the University of California. All Rights Reserved. Permission
to copy, modify and distribute any part of this gridded bathymetry at 30
second resolution for educational, research and non-profit purposes, without
fee, and without a written agreement is hereby granted, provided that the
above copyright notice, this paragraph and the following three paragraphs
appear in all copies. Those desiring to incorporate this global bathymetry
into commercial products or use for commercial purposes should contact the
Technology Transfer and Intellectual Property Services, University of
California, San Diego, 9500 Gilman Drive, Mail Code 0910, La Jolla, CA
92093-0910, Ph: (858) 534-5815, FAX: (858) 534-7345, E-MAIL:invent@ucsd.edu.
IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
LOST PROFITS, ARISING OUT OF THE USE OF THIS global bathymetry, EVEN IF THE
UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
THE global bathymetry PROVIDED HEREIN IS ON AN \"AS IS\" BASIS, AND THE
UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
UPDATES, ENHANCEMENTS, OR MODIFICATIONS. THE UNIVERSITY OF CALIFORNIA MAKES
NO REPRESENTATIONS AND EXTENDS NO WARRANTIES OF ANY KIND, EITHER IMPLIED OR
EXPRESS, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR THAT THE USE OF THE
global bathymetry WILL NOT INFRINGE ANY PATENT, TRADEMARK OR OTHER RIGHTS.";
    String Metadata_Conventions "COARDS, CF-1.6, Unidata Dataset Discovery v1.0";
    Float64 Northernmost_Northing 90.0;
    String reference 
"Becker, J. J., D. T. Sandwell, W. H. F. Smith, J. Braud, B. Binder, J.
Depner, D. Fabre, J. Factor, S. Ingalls, S-H. Kim, R. Ladner, K. Marks, S.
Nelson, A. Pharaoh, G. Sharman, R. Trimmer, J. vonRosenburg, G. Wallace, P.
Weatherall., Global Bathymetry and Elevation Data at 30 Arc Seconds
Resolution: SRTM30_PLUS, revised for Marine Geodesy, January 20, 2009";
    String sourceUrl "http://geoport.whoi.edu/thredds/dodsC/bathy/srtm30plus_v1.nc";
    Float64 Southernmost_Northing -89.99166666666667;
    String standard_name_vocabulary "CF-12";
    String summary 
"This is global topography data. The grid resolution is 30 seconds which is
roughly one kilometer.

Land data are based on the 1-km averages of topography derived from the USGS
SRTM30 grided DEM data product created with data from the NASA Shuttle Radar
Topography Mission. GTOPO30 data are used for high latitudes where SRTM data
are not available.

Ocean data are based on the Smith and Sandwell global 1-minute grid between
latitudes +/- 81 degrees. Higher resolution grids have been added from the
LDEO Ridge Multibeam Synthesis Project, the JAMSTEC Data Site for Research
Cruises, and the NGDC Coastal Relief Model. Arctic bathymetry is from the
International Bathymetric Chart of the Oceans (IBCAO) [Jakobsson et al.,
2003].";
    String title "Topography, SRTM30+ Version 1.0, 30 arc second, Global";
    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 Data Access Protocol (DAP) and its projection constraints.

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
http://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.htmlTable?sst[(2007-10-21T00:00:00)][0][(-75):100:(75)][(180):100:(360)]
Thus, the query is often a variable name (e.g., sst),
followed by a set of [] for each of the variable's dimensions
(for example, [time][altitude][latitude][longitude]),
with your desired (start):stride:(stop) values within each [].

For details, see the griddap Documentation.

ERDDAP, Version 1.42
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