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

[John]

Luke, Albert:

Thanks.. yes I'm thinking re is what I need... and using negative values for
west, and positive for east is our convention. The problem I have is that
not all the data was provided in that format, so I'm in the process of
converting...

There are a number of problems with my original post. For one, the
conversion to decimal fails if given a negative number (i.e. -9 30' in my
approach becomes 8.5 when it should be 9.5). So, to get around that I need
to use abs, and add some if cases to convert it back to negative..

Anyway, still working through this...


On 7/11/07, Albert Weiss <aweiss at unlnotes.unl.edu> wrote:
>
>
> 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
>    To
> tutor at python.org  cc
>   Subject
> [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
>  _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
>
>


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