John,<div><br></div><div> 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? </div><div>
<br></div><div> Thanks,</div><div><br></div><div> Arlindo</div><div><br></div><div><br><div class="gmail_quote">On Thu, Nov 12, 2009 at 10:52 AM, Huddleston, John <span dir="ltr"><<a href="mailto:Huddleston@cira.colostate.edu">Huddleston@cira.colostate.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Arlindo, here is a list of projections for Antartica:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">$ ls Coordinate\ Systems/Geographic\ Coordinate\
Systems/Antarctica/</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Australian Antarctic 1998.prj Deception Island.prj
Pointe Geologie Perroud 1950.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Camp Area
Astro.prj
Petrels 1972.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">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. </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Projections for the world would fall into one of two categories:
Geographic and Projected.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> $ ls Coordinate\ Systems/Geographic\ Coordinate\
Systems/World/</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">ITRF 1988.prj ITRF 1991.prj ITRF 1994.prj ITRF
2000.prj WGS 1966.prj </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">ITRF 1989.prj ITRF 1992.prj ITRF 1996.prj ITRF
2005.prj WGS 1972 TBE.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">ITRF 1990.prj ITRF 1993.prj ITRF 1997.prj NSWC
9Z-2.prj WGS 1972.prj and WGS 1984.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">and</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">$ ls Coordinate\ Systems/Projected\ Coordinate\ Systems/world</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Aitoff (world).prj
Flat Polar Quartic (world).prj Sinusoidal (world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Behrmann
(world).prj
Fuller
(world).prj
Sphere-based</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Bonne
(world).prj
Gall Stereographic (world).prj The World from Space.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Craster Parabolic
(world).prj Goode Homolosine
(Land).prj Times (world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Cube
(world).prj
Goode Homolosine (Ocean).prj Van der Grinten I (world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Cylindrical Equal Area (world).prj Hammer-Aitoff
(world).prj Vertical Perspective
(world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Eckert I
(world).prj
Loximuthal (world).prj
WGS 1984 PDC Mercator.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Eckert II
(world).prj
Mercator
(world).prj
WGS 1984 Web Mercator (Auxiliary Sphere).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Eckert III (world).prj
Miller Cylindrical (world).prj WGS 1984 Web Mercator.prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Eckert IV
(world).prj
Mollweide
(world).prj Winkel
I (world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Eckert V
(world).prj
Plate Carree (world).prj Winkel II
(world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Eckert VI
(world).prj
Polyconic
(world).prj Winkel
Tripel (NGS - world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Equidistant Conic
(world).prj Quartic Authalic
(world).prj</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Equidistant Cylindrical (world).prj Robinson (world).prj</span></p><div class="im">
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">John</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">John Huddleston, PhD</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Research Associate </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Cooperative Institute for Research in the Atmosphere</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Mail Stop 1375 @ CIRA</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Colorado State University</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Fort Collins, CO 80521</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">970-491-8602</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
</div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:arlindo.dasilva@gmail.com" target="_blank">arlindo.dasilva@gmail.com</a> [mailto:<a href="mailto:arlindo.dasilva@gmail.com" target="_blank">arlindo.dasilva@gmail.com</a>] <b>On Behalf Of </b>Arlindo
da Silva<br>
<b>Sent:</b> Thursday, November 12, 2009 8:36 AM<br>
<b>To:</b> Huddleston, John<br>
<b>Cc:</b> gradsusr<br>
<b>Subject:</b> Re: Another free shapefile for world maps</span></p>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal">On Thu, Nov 12, 2009 at 9:05 AM, Huddleston, John <<a href="mailto:Huddleston@cira.colostate.edu" target="_blank">Huddleston@cira.colostate.edu</a>>
wrote:</p>
<div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Arlindo,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Please excuse this direct email to you,
the GrADS email list does not allow me to reply or send anything to the list.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">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.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">As such, it is important to know the
projection of the world maps.</span></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">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:</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
</div>
<blockquote style="margin-left:30.0pt;margin-right:0in">
<p class="MsoNormal"><span><span style="font-size:13.5pt;font-family:"Times","serif"">The data is based upon a free map published
by <a href="http://www.terraspace.ru/" target="_blank">TerraSpace, Russia</a> as
referenced by <a href="http://data.geocomm.com/editorspicks/data_world11.html" target="_blank">Geocommunity</a>.
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 <span style="background:#FFFF66">reprojected into NAD27 to agree with the rest of the
world.</span></span></span></p>
</blockquote>
<div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">I am not sure what NAD27 is, but I was assuming it was a
standard projection. Let me know if you find anything.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal"> Arlindo</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
</div>
<p class="MsoNormal">-- <br>
Arlindo da Silva<br>
<a href="mailto:dasilva@alum.mit.edu" target="_blank">dasilva@alum.mit.edu</a></p>
</div></div></div>
</div>
</blockquote></div><br><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>
</div>