| Skymap and Array Problems [message #35763] |
Tue, 08 July 2003 12:43 |
wissels
Messages: 2
Registered: July 2003
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Junior Member |
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Hello,
I'm an undergraduate and admittedly inexperiened in the ways of IDL
(more akin to C++ and Java). I've been working on the following
problem for a while and could use any help you can offer.
At any rate, I must use IDL to plot a contour skymap of some data in
a particular region first in celstial coordinates and then in galactic
coordinates. I've used a procedure from the astro libraries on the
web to convert from ra and dec to galactic latitude and longitude.
Frustrated with MAP_SET and contour plots, I turned to object-oriented
graphics. Basically, I used three arrays: one for the data, one for
the x-coordinates and one for the y-coordinates. This was all fine
and good, until I converted to galactic coordinates, because in the
conversion, the lat is dependent on the long and vice versa. While I
originally began with a 110x110 set of coordinates independent of one
another, I am left with an set of 12100 points (x and y) corresponding
to each data point.
Furthermore, the galactic coordinates do not come out in sequential
order, so I need to sort them (along with their referenced data
points). This poses another problem, because the three arrays are
separate from each other, galx, galy, and gal_arr and I don't know how
to combine them so that I could read
galx galy gal_arr.
In case you can't tell from my jumbled question(s?), I need some help.
Any would be greatly appreciated!
Thanks!
Stephanie Wissel
------------------------------------------------------------ -------------------
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wissels@harper.uchicago.edu
wissels@yahoo.com
Center for Cosmological Physics--University of Chicago
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