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(Click on the images to enlarge.)

5. The “eye altitude” (shown at the bottom right) at this point is still at quite a distance.  For the most accurate measurement, it helps to zoom in so that the roof fills as much of the image field as possible. There are two ways to zoom in: you can use the slider in the top right corner of the image field, or you can scroll with your mouse wheel. (Make sure the cursor is within the image field to scroll.)

 

6. To make sure the image field stays centered on your roof, put the cursor (looks like a little hand) on your roof and hold down your left mouse button. This lets you drag the roof to the center of the image field: