<div dir="ltr">It is my experience that defined descriptive bounds tagged to coordinate systems has caused great confusion in GIS circles - especially for "legacy" systems. <div><strong style="margin:0px;padding:0px;border:0px;outline:0px;font-size:14px;vertical-align:baseline;color:rgb(77,77,77);font-family:Arial,Helvetica,sans-serif;line-height:19px">NAD_1983_To_WGS_1984_2</strong><span style="color:rgb(77,77,77);font-family:Arial,Helvetica,sans-serif;font-size:14px;line-height:19px"> for example, tagged for use in the Aleutians still is being used today with modern positional tools (like GPS).</span><br>
</div><div style><span style="color:rgb(77,77,77);font-family:Arial,Helvetica,sans-serif;font-size:14px;line-height:19px">Over the years, ESRI has refined their use of these and we welcome these changes. See the red text on this page.</span></div>
<div style><a href="http://support.esri.com/cn/knowledgebase/techarticles/detail/24159">http://support.esri.com/cn/knowledgebase/techarticles/detail/24159</a><span style="color:rgb(77,77,77);font-family:Arial,Helvetica,sans-serif;font-size:14px;line-height:19px"><br>
</span></div><div style><br></div><div style><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Oct 25, 2013 at 9:00 AM, <span dir="ltr"><<a href="mailto:proj-request@lists.maptools.org" target="_blank">proj-request@lists.maptools.org</a>></span> wrote:<br>
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1. Re: Projection bounds question (Hermann Peifer)<br>
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Message: 1<br>
Date: Thu, 24 Oct 2013 20:11:10 +0200<br>
From: Hermann Peifer <<a href="mailto:peifer@gmx.eu">peifer@gmx.eu</a>><br>
Subject: Re: [Proj] Projection bounds question<br>
To: "PROJ.4 and general Projections Discussions"<br>
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On 2013-10-24 17:57, Richard Greenwood wrote:<br>
> Coordinate systems do not generally have defined bounds although there<br>
> may be laws that govern where a given coordinate system is to be used.<br>
> In theory, you could represent any place on the earth in any coordinate<br>
> system.<br>
><br>
<br>
(Ahem)<br>
<br>
How would you represent a point at 52S 170W in ETRS89/LAEA Europe, also<br>
known EPSG:3035? 52S 170W happens to be the antipodal point of the<br>
coordinate system's projection centre.<br>
<br>
Hermann<br>
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End of Proj Digest, Vol 113, Issue 8<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Joel Cusick<div>GIS Specialist</div><div>c: 907.280.9724 w: 907.644.3549</div><div>240 W. Fifth Ave. Anchorage AK 99501</div></div>
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