Moving Around in the Viewfinder

When you first open the image tutorial_l7.tif, it fills only a small part of main view. To get a better feel for how the viewer works, the image needs to fill the window.

1. In order to zoom in on the view, choose the zoom in icon button from the toolbar at the top of the viewer and click on the image in the main view. If you want to zoom back out, use the zoom out icon icon. Zoom in until the image fills the main view. Here's an example screenshot.


2. Now take some time to notice some things about the three different widows. Notice that the upper left window (the location view) has a white box in it outlining the area that is in the main window.


3. To change the area shown in the main view (right side), hold the left mouse button down inside the white box in the location view (upper left) and drag the window to a new location. The image in the main view moves as you do this.


4. To change the size of the area shown in the main view, hold the left button down on a corner of the white box in the location view to resize the window. After you release the button, the image seen in the main window changes to match the extent of the box.


5. The detail view works in much the same way, except that it is linked to the main window instead of the location window.


6. Try using these three windows to take a closer look at one section in the main view, and a single field in the detail view.


7. You can also use the move image icon icon on the toolbar or the slider bars to move the location of the image in the main view. Explore the features discussed above until you feel comfortable with the function of each.


8. Another way to zoom in and out is to select a specific scale to view the imagery at. Do this by typing the scale you desire in the scale window scale window box. Alternatively, you can choose the pull down menu on the window and choose a predefined zoom level. Notice that as the scale goes from lower numbers (1:1000) to higher numbers (1:1000000) the area covered by the image on the screen increases.