08-16-2009, 12:59 PM
Gus, you don’t necessarily need Google earth. I usually use the bird’s eye view of Bing Maps (if it is available for that area). In the lower right corner you’ll see a little ruler that shows the scale of the pic on the screen. If I take a real ruler and measure the dimensions of a structure on the screen, I can compare them to this ruler in the corner. This method is not totally accurate, but it is good enough to get a good idea of the size of the building. To get the other dimension of a structure, I am using exactly the same method as Ed.
Kurt