|An annual glacial moraine.|
|LiDAR image of annual glacial moraines in West Falmouth.The |
image above represents about a third of a mile from north to south.
A month or so ago, I ran into a former student who was researching the glacial history of Maine at Bowdoin, and he introduced me to LiDAR (Light Detection And Ranging) hillshade images that are available for large portions of Maine, including my own backyard. What he revealed was that with the current imaging technology, we could see not only the large scale features, like Cape Cod, but the yearly inchings of the glacier. Unfulfilled with the images on the screen, I went out into the woods to groundtruth the pictures I saw. Small hills and low areas I have walked over for years without really thinking about their origin were shown to be moraines dropped each summer by the ice sheet as it receded northward.
|Looking up a moraine from a lowpoint in the terrain.|