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GES DISC Interactive Online Visualization and ANalysis Infrastructure (Giovanni) Online Users Manual:    Plotting Output Options in Giovanni

 

Plotting Output Options in Giovanni

For each of the plot functions described below, the "Generate Plot" button at the bottom of the Giovanni interface would be clicked after the selection information has been provided to the interface.

Generate Plot button  Generate Plot button

5.1  Area Plot

The first output option in Giovanni is the Area Plot option.    On the Selection Functions page, the following area was selected.   The year 2004 was selected as the Time Period.

 

Giovanni area plot selection illustration, North Atlantic region

The output  result of these selections is shown below.   Note that Giovanni provides header information indicating the time period.  The data shown are the chlorophyll concentrations for this region averaged over the entire year January-December 2004.

Chlorophyll concentration, North Atlantic Ocean, January-December 2004

5.2  Time Plot

The second output option in Giovanni is the Time Plot option.   On the Selection Functions page, a smaller area was selected, as shown below.

Giovanni selection, North Atlantic Ocean, time plot region

The Time Period selected was also January-December 2004.   The Time Plot output result is shown below.

Giovanni, North Atlantic ocean, time plot output, January to December 2004

5.3  Animation

The Animation output option creates a series of monthly Area Plots for the selected region, and displays them sequentially.    This option is useful for rapidly visualizing regions with seasonal variability and determining the most illustrative months for Area Plot output.

5.4  Hovmöller Plot (longitude versus time)

The two Hovmöller Plot output options create plots of the selected parameter as either longitudinal variation versus time or latitudinal variation versus time.      These plots allow a two-dimensional representation of changes occurring in a given region spanning a selected time period.  Using the same Area and Time Period selections as for the preceding Time Plot, the output result shown below is theHovmöller longitude versus time plot.   Time is the Y-axis and longitude is the X-Axis.   The data is averaged over the latitude range for the selected area.

;Giovanni, North Atlantic Ocean selected region, Hovmoller longitude versus time plot

5.5  Hovmöller Plot (latitude versus time)

The other Hovmöller Plot output option is the latitude versus time option.    The same region and Time Period selections used for the two previous plots are used again for this output option.    In this case, time is again the Y-axis, and latitude is the X-axis.   The data are averaged over the longitude range of the selected region.

Giovanni, North Atlantic Ocean selected region, Hovmoller latitude versus time plot, January-December 2004

Since most maps are plotted with latitude changing vertically, it may be easier to comprehend this image if it is rotated so that the latitude variation becomes the Y-axis:

Giovanni, North Atlantic region selection, Hovmoller latitude versus time plot, January-December 2004

Hovmöller plots allow visualization of spatial variability that may not be apparent in a simple time plot in which the data for the entire selected region are averaged to a single value.  

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Last updated: May 08, 2012 02:05 PM ET
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