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Map and Plot

Climate4impact allows you to view your data in the form of maps or more analytical plots before actually downloading the data you need. This should help you in selecting the (subsets of the) data you need much more precise. As a consequence this should considerably reduce the amount of data you need to transfer over the internet to your own computer, as the visualisation and analyses services run at the archive, not on your own computer.

Viewer

http://climate4impact.eu/impactportal/adagucviewer/

Which data can be visualized?

Climate4impact can visualize any OpenDAP server over HTTP port 80 (port 8080 is currently not supported), and a selected set of secured ESGF OpenDAP servers over HTTPS using port 443. In the latter case you will need an ESGF account which can be created according to these instructions. The data served by the OpenDAP server must comply to the Climate and Forecast Conventions (CF conventions) in order to be correctly visualized. Currenty regular latlon grids, projected grids, timeseries and swath data is supported. Data is visualized using the ADAGUC geographical information system.

How to visualize?

  1. Find a file to visualize.
    If you already have a THREDDS catalog or OpenDAP endpoint you can go to Browse your own catalogs or datasets.
    If you are looking for a CMIP5 or CORDEX set in the ESGF infrastructure you can go to Search.
  2. Browse the file in the datasetviewer, some variables in the file have the button "Visualize". These variables can be visualized.
  3. Click on visualize, the ADAGUC viewer opens. If you already have the viewer open, the new file will be added as a new layer for comparison.

Below is an example of an unrestricted OpenDAP URL served over port 80:
http://opendap.knmi.nl/knmi/thredds/dodsC/IS-ENES/TESTSETS/sic_ARC-44_ECMWF-ERAINT_evaluation_r1i1p1_SMHI-RCA4-SN_v1_day_20060101-20101231.nc
It will display the following when visited in a browser:
Opendap endpoint in browser

If you would like to see something more interesting you can always append the .das option to the url:
http://opendap.knmi.nl/knmi/thredds/dodsC/IS-ENES/TESTSETS/sic_ARC-44_ECMWF-ERAINT_evaluation_r1i1p1_SMHI-RCA4-SN_v1_day_20060101-20101231.nc.das
This will describe the variables and attributes of the file.
You can also explore the file in the datasetviewer, e.g.
http://climate4impact.eu/impactportal/data/datasetviewer.jsp?dataset=http%3A%2F%2Fopendap.knmi.nl%2Fknmi%2Fthredds%2FdodsC%2FIS-ENES%2FTESTSETS%2Fsic_ARC-44_ECMWF-ERAINT_evaluation_r1i1p1_SMHI-RCA4-SN_v1_day_20060101-20101231.nc.

When you click on visualize you will see the following:

Geographic map projections can be selected to see the file in a more natural way by selecting "Map Type"-->"Northern Hemisphere":


The same data in Northern hemisphere projection:

 

Visualization styles can be adjusted by choosing an other style, for example alpha transparency with contourlines for sea ice visualization:

A direct link is given here:
ADAGUC viewer with Sea Ice visualization over the north pole.

image: