[GRASS-user] Fwd: what's this coordinate?How can I do if I want to traverse the entire map

Johan Nilsson joni8135 at gmail.com
Sat Mar 9 10:29:30 PST 2013


Saw that I only mailed yhe asker and I will be corrected if I has wrong.

---------- Forwarded message ----------
From: Johan Nilsson <joni8135 at gmail.com>
Date: 2013/3/9
Subject: Re: [GRASS-user] what's this coordinate?How can I do if I want to
traverse the entire map
To: 孔晓泉 <u1mail2me at gmail.com>


As I understand it the coordinate you write is just a format, degrees in
grades:minutes and seconds in East and North. It say nothing about the
projection. Threre are a global projection used by GPS and it is called
WGS1980. You can with Google earth, see if the object on the map have the
same coordinates and see if that are correcct. But there are a lot of local
projection....

To register a unknown map, you need at least 4 coordinate and see how they
corenspond to the objekt.

If it is a digital map, there may bee projection information in meta data
sometimes in a separate file, or in the file it self.

Hope this may hrlp and if I'm wrong that someone can correct me.

/Cheers


2013/3/9 孔晓泉 <u1mail2me at gmail.com>

>  106:32:29.490774E   39:53:38.049989N
>  103:13:40.937174E   41:23:25.138711N
> what's this coordinate.
> How can I do if I want to traverse the entire map with this kind of
> coordinate or some another suggestion?
> The original plan was ready to use bash to get the value of the map
> and then increase the latitude and longitude of the method, which
> traverse the entire map data in the form I want, but this coordinate
> format, I have not seen, how can I use, or do you hava better
> traversal methods? thank you
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> grass-user at lists.osgeo.org
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>
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