SIMON KEAY: Aerial photography has really been very important for telling us a lot about the external area of Portus. In other words, between the Trajanic hexagonal basin and the river Tiber. And it’s revealed details of the ancient aqueduct which ran from Ponte Galeria to Portus, parts of the canal system, and a whole series of buildings on the river port. So it’s been very helpful there. It tells us less about the interior of the port around the hexagonal basin, simply because so much tree coverage obscures seeing structures on the ground. But, on the other hand, that’s where LiDAR comes in. Because LiDAR as a form of airborne scanning, if you like.
And it’s, therefore, possible to see below the tree line and to get quite a clear image of the topography of buildings and structures associated with the port there. So if you put the two together, they are, in fact, very complementary techniques.
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