This map is an example of a DOQQ representation. They are traditionally orthorectified aerial photos taken usually by the USGS. Oftentimes, as we can see here, the image is taken using infrared light. This light can pick up frequencies that lay outside of the eyesight of the human eye. Therefore, we can see things that a normal photograph can't capture. In these images, the contrast between land and water is higher, and, as we learned in the lecture, things like foliage becomes more pronounced. In DOQQ's each pixel represents 1 meter of land on the ground. This allows for uniformity between different DOQQ images taken.
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