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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Dan,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We didn’t want to require providers to start building
coordinate system libraries into their implementations. Currently, all
coordinate system projection work is done outside of FDO. The OS version of
MapGuide does its projection work outside of FDO using Proj4 for example.
Simple calculations would be Euclidian geometry based calculations.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>These functions are meant to be 2d functions. We could add 3d
functions in the future, e.g. called Length3D. The proposed functions should
compute area and length on the 2d data and ignore any z that is there. 3d
calculations would necessarily need to be more complex: area of a polygon would
need to deal with surfaces and not just polygon boundaries, length would need
to account for different xy and z units, etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Orest.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></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-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org [mailto:fdo-internals-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Dan Stoica<br>
<b>Sent:</b> Friday, September 07, 2007 11:10 AM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] RFC 11 has been posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>A few questions:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:black'>“It is the proposal of this RFC that providers that do not
use coordinate system libraries simply return simple calculations directly against
the lat/long data (i.e. using Euclidian geometry based calculations).”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>What “simple calculations” means exactly? It implies
returning the length in radians and area in square radians… </span><span
lang=EN style='font-family:Wingdings;color:#1F497D'>L</span><span lang=EN
style='font-family:"Verdana","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>There are algorithms around to do such transformations. How about
implementing them as common utilities? Is it too much trouble?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>Or say the user has a CSYS library like proj4. I believe it
would make sense to allow him to use it.<o:p></o:p></span></p>
<p><span lang=EN style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>“It should also be noted that the functions execute 2D
calculations only. Therefore, if an object is defined in space, the functions
should not be used to determine the area or length of such an object. “<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>Do you mean these functions will not work with 3D data (“</span><span
lang=EN style='font-family:"Verdana","sans-serif";color:black'>an object is
defined in space”) </span><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN style='font-family:"Verdana","sans-serif";
color:#1F497D'>Dan.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></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-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-family:"Tahoma","sans-serif"'> fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Thomas
Knoell<br>
<b>Sent:</b> Thursday, September 06, 2007 5:33 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> [fdo-internals] RFC 11 has been posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>A new RFC (<a href="http://trac.osgeo.org/fdo/wiki/FDORfc11">http://trac.osgeo.org/fdo/wiki/FDORfc11</a>)
has been posted. The RFC follows up on RFC 8 by adding geometric functions to
the list of well-known FDO functions. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Please review the RFC. Any comments/suggestions and
questions are welcome. All feedback is expected by the end-of-day <u>September
12<sup>th</sup> 2007</u>. If no changes are required it is my intent to motion
that a vote for the acceptance of the RFC be made and subsequently voted on by
the PSC.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> Thomas<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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