Tutoriel

Naviguer la Datathèque de l'IRI : Un Tutoriel

La Datathèque est un outil extrêmement puissant qui permet d'accéder, manipuler, et visualiser une grande variété de données des sciences de la terre en tout type de format (par exemple, fichiers de données, tables), de tracé visuel (par exemple, contour, couleurs, vecteurs), et de format graphique (par exemple, PostScript, GIF). Ce tutoriel est une introduction à la structure de la Datathèque et aux différentes manières d'y naviguer.

Find and Understand

Dataset Structure

You should now be more comfortable with finding datasets in the Data Library. Let us take a closer look at the information and utilities available to you when you select a dataset. You will not use these utilities in this section, but it is important to know what they do and where they are for Parts II and III. The NOAA NCDC DAILY FSOD dataset is a commonly used dataset and is the example for this section.

Locating Data

There are three ways to locate data within the Data Library: 1) a listing of some of the datasets by category; 2) a complete list of datasets according to their source; and 3) a keyword search powered by Google.

Select

Selecting Stations and Regions

This section is divided into two parts representing station and gridded data. If you are only interested in using gridded data, then you may want to use the tab to skip ahead to that section. Otherwise, it is suggested that you work through both sections to become acquainted with the operations for both types of data.

Selecting Data Variables

At this point, you should feel comfortable with the many ways to select data for specific locations. Let us now look at the ways of selecting data variables. These techniques are independent of the data type and we therefore use just one of the datasets to illustrate them.

Selecting a Time Period

You should now feel comfortable with selecting data for a specific region and for a specific variable. The last parameter to which data is typically constrained is the time period. You saw in a few of the examples in previous sections that time period selection typically occurs along with other steps. We have kept this step separate here to ensure that all of the methods by which a time period can be chosen are covered. As in the previous section, these techniques are the same for both station and gridded datasets.

Manipulate, Visualize, Download

Manipulating Data

This section covers arithmetic operations, setting limits, averages, as well as some other analyses.

Visualizing Data

The data selection and manipulation capabilities of the Data Library are extremely valuable on their own, but its data visualization techniques make the Data Library the truly complete tool that it is.

Downloading Data

In addition to the tools that select, manipulate, and visualize data, the Data Library makes those results and all data available in a variety of formats.