Another free shapefile for world maps

[Arlindo da Silva]

John,

    What is your recommendation? Should we reproject that free dataset for
general grads use? Are you setup for producing such a re-projected shapefile
with the corresponding .prj metadata?

    Thanks,

        Arlindo


On Thu, Nov 12, 2009 at 10:52 AM, Huddleston, John <
Huddleston at cira.colostate.edu> wrote:

>  Arlindo, here is a list of projections for Antartica:
>
>
>
> $ ls Coordinate\ Systems/Geographic\ Coordinate\ Systems/Antarctica/
>
> Australian Antarctic 1998.prj  Deception Island.prj  Pointe Geologie
> Perroud 1950.prj
>
> Camp Area Astro.prj            Petrels 1972.prj
>
>
>
> The NAD27 is North America Datum of 1927 and is, in general, not a good
> choice for projections of the world. The original maps that USGS created for
> the United States were based on NAD27 and the CLARK1866 sphere and they have
> been re-projected by USGS to NAD83 and the GRS80 sphere.
>
>
>
> Projections for the world would fall into one of two categories: Geographic
> and Projected.
>
>
>
>  $ ls Coordinate\ Systems/Geographic\ Coordinate\ Systems/World/
>
> ITRF 1988.prj  ITRF 1991.prj  ITRF 1994.prj  ITRF 2000.prj  WGS
> 1966.prj
>
> ITRF 1989.prj  ITRF 1992.prj  ITRF 1996.prj  ITRF 2005.prj  WGS 1972
> TBE.prj
>
> ITRF 1990.prj  ITRF 1993.prj  ITRF 1997.prj  NSWC 9Z-2.prj  WGS 1972.prj
> and WGS 1984.prj
>
>
>
> and
>
>
>
> $ ls Coordinate\ Systems/Projected\ Coordinate\ Systems/world
>
> Aitoff (world).prj                   Flat Polar Quartic (world).prj
> Sinusoidal (world).prj
>
> Behrmann (world).prj                 Fuller (world).prj
> Sphere-based
>
> Bonne (world).prj                    Gall Stereographic (world).prj  The
> World from Space.prj
>
> Craster Parabolic (world).prj        Goode Homolosine (Land).prj     Times
> (world).prj
>
> Cube (world).prj                     Goode Homolosine (Ocean).prj    Van
> der Grinten I (world).prj
>
> Cylindrical Equal Area (world).prj   Hammer-Aitoff (world).prj
> Vertical Perspective (world).prj
>
> Eckert I (world).prj                 Loximuthal (world).prj          WGS
> 1984 PDC Mercator.prj
>
> Eckert II (world).prj                Mercator (world).prj            WGS
> 1984 Web Mercator (Auxiliary Sphere).prj
>
> Eckert III (world).prj               Miller Cylindrical (world).prj  WGS
> 1984 Web Mercator.prj
>
> Eckert IV (world).prj                Mollweide (world).prj           Winkel
> I (world).prj
>
> Eckert V (world).prj                 Plate Carree (world).prj        Winkel
> II (world).prj
>
> Eckert VI (world).prj                Polyconic (world).prj           Winkel
> Tripel (NGS - world).prj
>
> Equidistant Conic (world).prj        Quartic Authalic (world).prj
>
> Equidistant Cylindrical (world).prj  Robinson (world).prj
>
>
>
> John
>
>
>
> John Huddleston, PhD
>
> Research Associate
>
> Cooperative Institute for Research in the Atmosphere
>
> Mail Stop 1375 @ CIRA
>
> Colorado State University
>
> Fort Collins, CO 80521
>
> 970-491-8602
>
>
>
> *From:* arlindo.dasilva at gmail.com [mailto:arlindo.dasilva at gmail.com] *On
> Behalf Of *Arlindo da Silva
> *Sent:* Thursday, November 12, 2009 8:36 AM
> *To:* Huddleston, John
> *Cc:* gradsusr
> *Subject:* Re: Another free shapefile for world maps
>
>
>
> On Thu, Nov 12, 2009 at 9:05 AM, Huddleston, John <
> Huddleston at cira.colostate.edu> wrote:
>
>  Arlindo,
>
>
>
> Please excuse this direct email to you, the GrADS email list does not allow
> me to reply or send anything to the list.
>
>
>
> I downloaded the world.tar.bz2 file and it does not contain a PRJ file.
> While the three DBF, SHP, and SHX files conform exactly to the ESRI 1994
> shapefile standard; the accuracy and precision of our software has increased
> significantly since the standard was propagated.
>
>
>
> As such, it is important to know the projection of the world maps.
>
>
>
> You may need to contact the data producers directly about this, it should
> be a simple matter to add a standard .prj file. However, on the website it
> says:
>
>
>
> The data is based upon a free map published by TerraSpace, Russia<http://www.terraspace.ru/> as
> referenced by Geocommunity<http://data.geocomm.com/editorspicks/data_world11.html>.
> I added Antarctica after Curt Mills pointed out that there was a missing
> continent. Antartica's data came from the Digital Chart of the World and was
> reprojected into NAD27 to agree with the rest of the world.
>
>
>
> I am not sure what NAD27 is, but I was assuming it was a standard
> projection. Let me know if you find anything.
>
>
>
>          Arlindo
>
>
>
> --
> Arlindo da Silva
> dasilva at alum.mit.edu
>



--
Arlindo da Silva
dasilva at alum.mit.edu
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