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<p>Actually, coordinate systems used by military forces have traditionally published bounds. For instance, the Maroc Nord and Maroc Sud zones have an eastern limit to their Grids that are defined by the 448,000 meter Easting (X) coordinate of the North African
ellipsoidal Bonne projection.<span style="mso-spacerun: yes"> </span>The intersection of this Grid limit with the graticule was a graphical simplicity but a computational nightmare until the paper of Karl Rinner was used at Army Map Service.<span style="mso-spacerun: yes">
</span>In the 1930’s, Professor Rinner published a paper (in German) detailing his development of the formulae for the ellipsoidal Bonne projection in series form.<span style="mso-spacerun: yes">
</span>AMS developed a reversion of his series, and computational algorithms were developed for the North African Bonne in Morocco among other places.<span style="mso-spacerun: yes"> Most of the battle zones of WWII were in Grid Zones that had published boundaries,
and some of the boundaries famously employed ellipsoidal loxodromes.</span></p>
<p><span style="mso-spacerun: yes"></span> </p>
<p><span style="mso-spacerun: yes">With regard to the UTM, the traditional bounds are three degrees on either side of the central meridian. At higher latitudes there are some noted exceptions, including the "zipper" in Northern Scandanavia with respect to
the Military Grid Reference System (MGRS) which is based on the UTM.</span></p>
<p><span style="mso-spacerun: yes"></span> </p>
<p><span style="mso-spacerun: yes">Not common nowadays, bounds still exist for dozens of legacy Grid Systems.</span></p>
<p><span style="mso-spacerun: yes"></span> </p>
<p><span style="mso-spacerun: yes">People should read more of my publications ...</span></p>
<p><span style="mso-spacerun: yes"></span> </p>
<p><span style="mso-spacerun: yes">:-)</span></p>
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<p><font face="Copperplate Gothic Bold">Clifford J. Mugnier, c.p., c.m.s.</font></p>
<p><font face="Copperplate Gothic Bold">Chief of Geodesy</font></p>
<p><font face="Copperplate Gothic Bold">LSU Center for GeoInformatics (ERAD 266)</font></p>
<p><font face="Copperplate Gothic Bold">Dept. of Civil Engineering (P.F. Taylor 3531)</font></p>
<p><font face="Copperplate Gothic Bold">LOUISIANA STATE UNIVERSITY</font></p>
<p><font face="Copperplate Gothic Bold">Baton Rouge, LA 70803</font></p>
<p><font face="Copperplate Gothic Bold">Academic: (225) 578-8536</font></p>
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<div style="DIRECTION: ltr" id="divRpF831411"><font color="#000000" size="2" face="Tahoma"><b>From:</b> proj-bounces@lists.maptools.org [proj-bounces@lists.maptools.org] on behalf of Richard Greenwood [richard.greenwood@gmail.com]<br>
<b>Sent:</b> Thursday, October 24, 2013 10:57 AM<br>
<b>To:</b> PROJ.4 and general Projections Discussions<br>
<b>Subject:</b> Re: [Proj] Projection bounds question<br>
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<div>Coordinate systems do not generally have defined bounds although there may be laws that govern where a given coordinate system is to be used. In theory, you could represent any place on the earth in any coordinate system.<br>
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Regarding UTM, a given coordinate pair would be valid in any of the 60 UTM zones since false x and y are the same in every zone. Only the longitude origin changes between zones.<br>
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I don't know if this would be helpful in your case, but an interesting tool that was introduced at FOSS4G-NA this year can help make educated guesses about coordinate systems:
<a href="http://projfinder.com/" target="_blank">http://projfinder.com/</a><br>
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<div>Rich</div>
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-- <br>
Richard Greenwood<br>
<a href="mailto:richard.greenwood@gmail.com" target="_blank">richard.greenwood@gmail.com</a><br>
<a href="http://www.greenwoodmap.com" target="_blank">www.greenwoodmap.com</a> </div>
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<div class="gmail_quote">On Thu, Oct 24, 2013 at 3:11 AM, Tamas Szekeres <span dir="ltr">
<<a href="mailto:szekerest@gmail.com" target="_blank">szekerest@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div dir="ltr">Hi,
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Is there a way to find out the bounds of a given projection?<br>
Let’s say I have a given projection (UTM) and have a point (supposedly in the same utm) but I want to find out if that point is within the bounds of the projection.
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<div>Let me know if you have ideas.</div>
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<div>Best regards,</div>
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<div>Tamas</div>
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