IRI Web Tutorials > Drought Monitoring Information

§ Global WASP Analyses
This page displays the WASP Index average over 1, 3, 6, 9, and 12 months. You can find explanatory information about the WASP index and a legend for interpreting the plots at the bottom of the page.
> Click on any of the plots to activate a data viewer that allows you to adjust with the plot.

§ IRI Data Library "Data Viewer"
The Data Viewer allows you to do many things, including zooming in on a location, changing the size of the plot, and changing the date of the plot.

What would you like to do?

Zoom on a particular region
> Click on the "Zoom" button, on the left-hand side of the plot, to get a menu of zooming options. The options "x2" and "x4" zoom in, and the options "x1/2" and "x1/4" zoom out. Choosing x4 will zoom in twice as much as x2, while x1/4 will zoom out twice as much as x1/2.
> Select one of the zooming options from the menu.
> Click on any point on the map that interests you. This action will bring up a zoomed map centered over the point you clicked.

Change the date
Above the plot in the data viewer you will see the date for which the plot applies (e.g., "Aug 2002"). You can change the date of the plot (within the available range of data, of course) in two ways:
> Click on the date and edit it to the date you want (e.g., "Jan 1982").
> Click on the "Redraw" button on the lower-left side of the plot to generate a plot for the new date.
> Click on the button immediately to the right of the date. This button(s) allows you to see the plot for one month earlier (or later).

Animate the plot
You can loop over many months of the plot to see how conditions have changed over time.
> Click on the date and edit it to the following format: "Date1 to Date2" (but don't include the quotation marks), where Date1 is earlier than Date 2 (e.g., Mar 1982 to Mar 1983).
> Click on the "Redraw" button on the lower-left side of the plot to generate an animated loop of plots from Date1 to Date2.
You can change the speed of the animation by changing the "animation frame times" in the box under the plot.
> To slow down the animation, change the default "first" and "middle" settings to a larger number (say 100).
>Click on the "Redraw" button to apply the new settings.

This should be enough to get you started. Feel free to experiment.