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Pickers
UK
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 Posted - 11/25/2005 : 08:45:10 AM
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Hi, I'm very new to this and I was wondering if ORIGIN was capable of doing the following for me:
I have a list of galactic coordinates (sources of x and gamma rays), and I wanted to put them on a plot of longitude/latitude.
To visualise what Im trying to do, I want to fill a coordinate system of the form seen here - http://ngala.as.arizona.edu/dennis/instruct/ay14/galactic.html with several 'points' to see how they are distributed across the sky.
Can anyone help me with this?
Thanks
Pickers |
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Pickers
UK
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Posted - 11/26/2005 : 09:51:14 AM
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By the way that site isnt what Im trying to do (i.e im not in that lab, or even at the university  ). I stumbled across it when googling for a plotting program, and it displays graphically the kind of coordinate system I need to produce.
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fzimnoch
USA
28 Posts |
Posted - 11/29/2005 : 10:11:48 AM
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Hi Pickers:
It appears that you want to project objects referenced to the galactic center onto a sphere and then produce a map.
These maps are easy to make. All thats required are the two functions f&g that transform longitude and latitude from the sphere onto x&y of the map or: X=f(longitude, Latitude), and Y=g(longitude, latitude) along with associated parameters for the sphere and perspective.. There are numerous transformations that accomplish this projection. Usually they preserve angles (Mercator), or area, (Lambert) or distance (Azimuthal Equidistant) or some other aspect thats considered important.
See examples for the earth in our graph gallery under 2D graphs
FRED |
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Galactic Coordinates