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fivemackY'know, if testing an algorithm which turns out to rely absolutely critically on precise to-the-pixel identification of surface features between images, maybe I should have chosen something other than Titan, an object all of whose surface features have critically fuzzy edges.
To obtain this image (click on it! it grows bigger!), I took the four photos that I photo-mosaiced incompetently yesterday, then solved for the best-fit circle to the ones showing limbs, then solved for the circle parameters for the ones not showing limbs by requiring the features to map to the same places as features whose positions I knew by reference to the limbs. I've then cropped off the bits that were black, or so close to a pole as to be absurdly fuzzy. I'm impressed at the continuity of scale and of colour.
The scale on this map is slightly too small to see the Mysterious Scratch without the eye of faith, but it's visible at the terminator on the big image.
This is a cylindrical projection, nothing like as good even as Mercator's, and with arbitrarily chosen equator and poles.
It is an odd feeling to be producing what I think may be the first maps of unexplored parts of a new world. I wonder if anyone will bother to name these craters. There are enough hundreds of them to drain the name-stocks of the Aeneid many times over.
To obtain this image (click on it! it grows bigger!), I took the four photos that I photo-mosaiced incompetently yesterday, then solved for the best-fit circle to the ones showing limbs, then solved for the circle parameters for the ones not showing limbs by requiring the features to map to the same places as features whose positions I knew by reference to the limbs. I've then cropped off the bits that were black, or so close to a pole as to be absurdly fuzzy. I'm impressed at the continuity of scale and of colour.
The scale on this map is slightly too small to see the Mysterious Scratch without the eye of faith, but it's visible at the terminator on the big image.
This is a cylindrical projection, nothing like as good even as Mercator's, and with arbitrarily chosen equator and poles.
It is an odd feeling to be producing what I think may be the first maps of unexplored parts of a new world. I wonder if anyone will bother to name these craters. There are enough hundreds of them to drain the name-stocks of the Aeneid many times over.
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Date: 2004-12-17 02:01 pm (UTC)This is very cool. Also gorgeous.
There are a lot of names in the Aeneid, all those sailors and spear-carrying Carthaginians. What I think would be beyond weird would be calling one of those craters Aeolus -- opener of the bag of the winds -- who appears in book 1 to cause a storm at Juno's behest and then have an argument with Neptune. If there's one thing Dione doesn't have more than anything else it's wind. It might have ice, which is like an ocean, sort of, but you can just tell looking at those images that there was never any wind, not even once.