Author Topic: How the illumination direction can change perspective  (Read 2661 times)

Geoff

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  • The history of astronomy is a history of receding horizons. - Hubble.
How the illumination direction can change perspective
« on: September 23, 2012, 09:34:35 am »
I have been exploring Anaxagoras crater which is close to the north pole of the Moon and the illumination often comes from below which can cause problems when trying to work out what you are seeing. The first image below appears to show "ridges" across the terrain:


M109309907LC  Latitude: 73.7  Longitude: -9.5


If you rotate the image 180 degrees you get the following:



- the "ridges" have now become cracks or depressions.


jules

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Re: How the illumination direction can change perspective
« Reply #1 on: September 23, 2012, 08:44:05 pm »
So these really are cracks then if illumination is from below. I wish my brain would agree without turning upside down!

kodemunkey

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Re: How the illumination direction can change perspective
« Reply #2 on: September 23, 2012, 08:45:36 pm »
You can turn your brain upside down? tell me more.

jules

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Re: How the illumination direction can change perspective
« Reply #3 on: September 23, 2012, 08:48:17 pm »
It's a skill. I usually recommend turning the computer upside down. It's less dangerous.