Saw that I only mailed yhe asker and I will be corrected if I has wrong. ---------- Forwarded message ---------- From: Johan Nilsson <[email protected]> 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 <[email protected]>
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 <[email protected]> > 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 > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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