I need to know the square footage of a long, curving private road with two irregularly shaped adjoining driveways. I've printed out a bird's eye view of the property with Google, used the exact known dimensions of a house in the photo to establish the scale, then made measurements as best I can on the photo, which indicates the road total is about 6,000 square feet (the red box is about 235' wide and 300' tall):
Is some kind of online tool available that will give me a more accurate estimate? For example, by outlining a region the tool will tell me the area? Even a "pixel painting" program that lets me do a flood-fill then tells me the number of pixels used would work.