Thank you very much Andrea, I really appreciate!
All the best,
--
Lmhelp
On 05/08/2011 5:22 PM, Andrea Aime wrote:
On Sun, May 8, 2011 at 12:58 AM, Lmhelp<[email protected]> wrote:
> Hi Andrea,
>
> I am sorry for my late answer.
>
> You probably are right about EPSG:2154 though I am not a specialist...
>
> In the near future, I'll not be working anymore with these data.
> Instead of French departments I'll need world states.
> And actually... I don't know "where" I can get these data for free... do
> you?
Try here, they have worldwide free vector data:
http://www.naturalearthdata.com/
> But, yes indeed, you are totally right: "Knowing the exact spatial reference
> system of your data is important, otherwise you don't really know what part
> of the earth the data refers to."
> So maybe, if it's not too much asking, could you advise me some good
> literature about these issues?
The Snyder would be the bible in the respect:
http://www.amazon.com/Flattening-Earth-Thousand-Years-Projections/dp/0226767477/ref=sr_1_2?ie=UTF8&qid=1304868068&sr=8-2
Anyways, if you look for "map projection datum primer" on Google you'll find
some useful introductory links
Cheers
Andrea
-- ------------------------------------------------------- Ing. Andrea
Aime GeoSolutions S.A.S. Tech lead Via Poggio alle Viti 1187 55054
Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313
http://www.geo-solutions.it http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf
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