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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Fictitious datum? That’s
offensive, daan. When the datum is ignored, cartography is an entertainment
merely purporting to represent the real world. That’s fine, but (the)
datum is hardly fictitious. -Noel<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
proj-bounces@lists.maptools.org [mailto:proj-bounces@lists.maptools.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>strebe<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, March 29, 2009 2:15
PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">PROJ.4
and general Projections Discussions</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Proj] datum matters</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
On Mar 29, 2009, at 9:10:46 AM, "Richard Greenwood"
<richard.greenwood@gmail.com> wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=apple-style-span><font size=1 color=black
face=-webkit-monospace><span style='font-size:8.5pt;font-family:-webkit-monospace;
color:black'><span style='orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
-webkit-border-vertical-spacing: 0px;-webkit-text-decorations-in-effect: none;
-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0;word-spacing:0px'>The
"computational burden" of comparing the input and output datum is</span></font></span><font
size=1 color=black face=-webkit-monospace><span style='font-size:8.5pt;
font-family:-webkit-monospace;color:black'><br>
<span class=apple-style-span>no more intensive than converting from radians to
degrees.</span></span></span></font><font color=blue><span style='color:blue'><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>But this is quite my point about misplaced conceptual burdens. Many
people do not even have datums attached to their cartographic data because the
datum is irrelevant at the scale they are working.. What is the use of forcing
them to declare a fictitious datum in order to satisfy an ideological
conflation of datum and projection?<o:p></o:p></span></font></p>
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<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=apple-style-span><font size=1 color=black
face=-webkit-monospace><span style='font-size:8.5pt;font-family:-webkit-monospace;
color:black'><span style='orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
-webkit-border-vertical-spacing: 0px;-webkit-text-decorations-in-effect: none;
-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0;word-spacing:0px'>Hopefully</span></font></span><font
size=1 color=black face=-webkit-monospace><span style='font-size:8.5pt;
font-family:-webkit-monospace;color:black'><br>
<span class=apple-style-span>you will not argue that we limit ourselves to
radians. The "conceptual</span><br>
<span class=apple-style-span>burden" is more subjective, but closer to my
point: That to a growing</span><br>
<span class=apple-style-span>number of users, datum does matter.</span><br>
<br>
</span></font><font color=blue><span style='color:blue'></span><o:p></o:p></span></font></p>
</blockquote>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>The number may be growing, but they will never be even close to
everyone. I do not agree everyone should be forced into artificial procedures
in order to save some fraction of them from their own ignorance. That is
arrogance, if nothing else. No one knows what is best for everyone. Datum and
projection are distinct. Let those who need to treat them distinctly, treat
them distinctly. Let those who may or must ignore datums, ignore datums.<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Regards,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>— daan Strebe<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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