[Tutor] An interesting case... of east vs. west

[Albert Weiss]

John: One way to handle the situation of longitude is to make everything 
west of the Greenwich meridan a negative value until -180 degrees and 
everything east of Greenwich a positive value. HTH.
        Albert





John <washakie at gmail.com> 
Sent by: tutor-bounces at python.org
07/10/2007 04:22 PM

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[Tutor] An interesting case... of east vs. west






I was trying to read in a tab delimited file i was given with lat and lon, 
the thing is I needed decimal lat, and decimal long... well, anyway I 
think you can see what my problem was:
 
for i in range(0,344) 
   y=d[i][2].split('\xb0') 
    x=d[i][3].split('\xb0') 
    ydeg,ymin=y[0].strip(),y[1].rstrip('\' N').rstrip("\' S") 
    xdeg,xmin=x[0].strip(),x[1].rstrip("\' E").rstrip("\' W")
    if re.search('\ZW','x[1]') xmin=-1*xmin 
    if re.search('\ZS','y[1]') ymin=-1*ymin 
    declat=int(ydeg)+(float(ymin)/60) 
    declon=int(xdeg)+(float(xmin)/60) 
 
The thing is, it isn't terribly robust (I'm not even positive it's working 
correctly!!). For instance, as you might have guessed I was given Lat and 
Lon in the following format:
STNA 45° 49' N 08° 38' E
STNB 46° 58' 19° 33' E
STNC 53°33'  -9°54' 
STND 51°32' N 12°54' W 
 
Some indicating north or some, and some not. This wasn't a concern, as I 
knew they were all North. However, the West / East issue is another story. 
Anyone have a more elegant solution?
 
-john
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