3. Displaying Data

The satellite image window (see Figure 1) that appears on the screen is comprised of a few distinct sections. At the top is the control area. It contains the buttons that control what is drawn in the image area directly below it.

Figure 1: The Satellite Image Window

The image area is where maps, satellite swaths, and overlays will appear. On the bottom and right side of the image area are two scroll bars. Their function is to scroll the image. If you don't see the use of this now, hopefully it will become clear later.

On the right-hand side of the image area is a long vertical box. When a satellite swath is rendered, this box will contain a color bar. Below the image area is the status indicator. The message displayed in the lower left corner will keep you apprised of exactly what operation SatView is performing, and when it is free to accept new commands.

Finally, directly to the right of the image area is the toggle button area. When a satellite image window is first created, there is only one button in this area and it is labeled Map. This object is a toggle button; it turns the map on and off. If you click on it once, a map will appear in the image area and the button's label will turn red (on a color screen). Clicking on it again will remove the map and return the label to its former color. Later, this button will be joined by other toggle buttons. Each time you plot a satellite swath or an overlay, another toggle button will be created beneath the Map button. The function of each button is to toggle the visibility of the viewable data it is associated with.