Here is a project by realworldmath.org. Real World Math integrates Google Earth with various math topics, this one on Complex Area. Below is a very brief excerpt from their site, but you need to visit the site itself for the full project:
•Find the area of complex polygons
•Solve word problems involving rates
This lesson consists of two parts. The first requires students to find the area of a complex shape using … the area formulas for a parallelogram and triangle.
The second part … Students will need to be able to solve rate problems with a proportion for this section.