I saw this cool map of ancient Rome overlayed on Google Earth and I thought to myself I bet I could do that.
So I took a few minutes and looked around for an old map of Boulder, Colorado. Rare-Maps.com, a local Boulder gallery had a cool map from 1910. I then open Google Earth navigated to Boulder and used the Add Image Overlay function.
The overlay function is pretty straightforward. You can zoom in and out, resize the overlay, and skew it if you need to. It took me a few minutes to get the correct sizing and positioning on the map. I think it helps to align a feature that is on both Google Earth and the overlay. Once the feature is lined up I scaled the overlay until most of the features matched. I say most because I noticed I couldn’t get everything to lineup. I think the overlay may be a little off on scale and we are use a flat image to represent a curved surface.
Here is the Google Earth file if you are interested in taking a look.