CDF Windows Imaging Tool (CWIT) Tutorial
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CDF is a conceptual data abstraction for storing multi-dimensional data sets.
The basic component of CDF is a software programming interface that is a
device independent view of the CDF data model.  The application developer is
insulated from the actual physical file format for reasons of conceptual
simplicity, device independence, and future expandability.

CWIT is an application that graphically visualizes CDF data sets
on Microsoft Windows.

The following tutorial walks you through a CWIT session, in which you display
data from two sample CDFs (d103a.cdf and fnoc1.cdf) located via anonymous ftp
on ncgl.gsfc.nasa.gov (128.183.10.238) in the /pub/cdf/samples/data directory.

Sample CDFs:

DE-1 Auroral Imager (SAI) images, CDAW-9:
        /pub/cdf/samples/data/d103a.cdf

FNOC Surface Grid - Global Spherical 73x144:
        /pub/cdf/samples/data/fnoc1.cdf

Climate Analysis Center Sea Surface Temperature data:
        /pub/cdf/samples/data/cacsst1.cdf

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Dataset 1: FNOC1.CDF

a. Press Ctrl-O to select and open the dataset 'fnoc1.cdf'.
b. Select '_TMP' as the pseudo-color variable from the Setup menu.
c. Press Ctrl-R to display the data in raw form.
d. Press Ctrl-P to use the play panel and select the following options:
	Rendering style	-> Global Warp
	Latitude	-> LATITUDE
	Longitude	-> LONGITUD
e. Click on the Coastlines and Fiducial lines checkboxes.
f. Select "Run" from the Action submenu from the Main window.
g. Press Ctrl-L to load palette, change to the palette directory,
   and select "rainbow.pal".


Dataset 2: D103A.CDF

a. Open "d103a.cdf" from File/Open menu item.
b. Select "D103KRAY" as the Pseudo-color variable from Setup menu.
c. Set 'Rendering Style' from the Setup menu to "As is in file"
d. Press Ctrl-R to display the data in raw form.
e. Press Ctrl-P to use the play panel and select the following options:
	Rendering style	-> Global Warp
	Latitude	-> D103GOLT
	Longitude	-> D103GOLN
f. Click on "Center Lat..Scale" box in upper-right corner to open a dialog;
   change the Center Lat to -45 and the Center Lon to 90, and press "OK".
g. Press Alt-F4 to close Playpanel
h. Press Ctrl-R to project data onto globe
i. Select "GreyScale" from Color menu
j. Click mouse on image and drag mouse while holding the left mouse button
   to select a region of the image
k. Choose "Crop" from Edit menu to cut out the selected region


Now that you know the basics of CWIT, you can have fun experimenting with
the other options and different CDF data sets.  If you need help, select
"Contents" from the Help submenu in the Main Window or press Shift+F1.

For more information about CDF and related products, read the readme files
located in /pub/cdf/cdf24-dist.

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