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converting planetographic coordinates to planetocentric coordinates?
ncc1701d
post Oct 17 2016, 10:02 PM
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Hello
Can someone explain to me the math behind converting planetographic coordinates to planetocentric coordinates and vise versa?
The best info i found is on this link
ftp://naif.jpl.nasa.gov/pub/naif/too...ib/plnsns.html
but it is incomplete and I dont know fortran.
Thank you.
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nogal
post Oct 17 2016, 11:08 PM
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Hi ncc1701d!

Here is a link to an interactive demonstration of planetocentric and planetographic coordinates. It is part of the ISIS workshop which contains a wealth of information in a well explained maner.

You may also like this article: http://www.daviddarling.info/encyclopedia/...oordinates.html

In ISIS I found this bit of code for planetographic to planetocentric convertion: https://isis.astrogeology.usgs.gov/IsisSupp...hp?topic=1550.0

Fernando
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JohnVV
post Oct 18 2016, 02:12 AM
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for the earth in my home state Michigan
the island i like to backpack " Isl Royale" , Lake Desor is at
Planetocentric on the left
Planetographic on the right
is 302 x 125 for Planetocentric
is 302 x 113 for Planetographic
at 60 PPD


depending on the resolution and latitude this might be as little as 1 or 2 px or 50+

Planetocentric is a circle ( center is used)
Planetographic is an Ellipse ( the focus points of the ellipse are used )
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ncc1701d
post Oct 18 2016, 07:40 AM
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thanks guys for the info!
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