Method’s Con-trails

Caught a small
blip of discussion
yesterday concerned with whether or not Google Earth


the lost city of Atlantis
. Remnants of the elusive, underwater cityscape?

According to Google Maps Mania,


It’s true that many amazing discoveries have been made in Google Earth
including a pristine forest in Mozambique that is home to previously unknown
species and the remains of an Ancient Roman villa.

In this case, however, what users are seeing is an artefact of the data
collection process. Bathymetric (or sea floor terrain) data is often
collected from boats using sonar to take measurements of the sea floor.

The lines reflect the path of the boat as it gathers the data. The fact
that there are blank spots between each of these lines is a sign of how
little we really know about the world’s oceans.

How little we know, indeed. Is this Atlantis? The conspiracy doesn’t interest me all that much.
Instead, I’m struck by the impression: the stamp left by the "systematic"
tracing, the residue of the surface-to-sea-floor method (a term others
have smartly untangled it into meta-hodos or something like ‘beyond
ways’, even ‘ways
beyond’; this etymological dig lingers with me). The deep blue grid of
"bathymetric data" elicits questions: why don’t we see these in the adjacent
areas? What was it about this boat, this collection process,
translation from sound to image, that left behind the vivid trails?

Robert Sarmast
elaborated on the image’s trail-grid, noting:

The lines you’re referring to are known as "ship-path artifacts" in the
underwater mapping world. They merely show the path of the ship itself as it
zig-zagged over a predetermined grid. Sonar devices cannot see directly
underneath themselves. The lines you see are the number of turns that the
ship had to make for the sonar to be able to collect data for the entire
grid. I’ve checked with my associate who is a world-renowned geophysicist
and he confirmed that it is artifact. Sorry, no Atlantis.

More provocations here: the grid’s unevenness, its predetermination, the
inability of the sonar devices to see (erm…hear) directly below. And
yet, a telling illustration of method alongside method: seems to me a subtle
allegory in the adjacency of ocean floor imagery with lines and without.
Presumably, the surrounding ground was measured similarly. Why no lines?