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Huge rocks at Mons Hansteen
wildespace
post Jul 4 2013, 08:27 AM
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Greetings. What is your opinion on the origin of big rocks that are visible at this location at Mons Hansteen (also known as the "Arrowhead"). One of the rocks casts a particularly long shadow.

Could they be volcanic plugs, or simply hard rocks exposed through erosion? Would love to hear your take on this. Thanks.

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JohnVV
post Jul 6 2013, 10:54 PM
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without knowing the exact time the image was taken for that lat / long
And the exact pixel resolution < PPM> or <PPD>
knowing the exact position of the sun above the horizon for the location
i can not calculate the Height

If the Sun is right ON the horizon then they might be rather small .
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wildespace
post Jul 6 2013, 11:56 PM
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QUOTE (JohnVV @ Jul 6 2013, 11:54 PM) *
without knowing the exact time the image was taken for that lat / long
And the exact pixel resolution < PPM> or <PPD>
knowing the exact position of the sun above the horizon for the location
i can not calculate the Height

If the Sun is right ON the horizon then they might be rather small .


I believe you can find those details when looking at the individual NAC strips, such as http://wms.lroc.asu.edu/lroc/view_lroc/LRO....0/M181494651LC or http://wms.lroc.asu.edu/lroc/view_lroc/LRO....0/M166182355RC

But the problem with using shadow length in calculations is that it's falling downhill, therefore being longer than if it were on flat ground.


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