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<p class="MsoNormal"><span style="color:#1F497D">Please see </span><b><span style="color:black">inline.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Dan.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> fdo-internals-bounces@lists.osgeo.org [mailto:fdo-internals-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Gavin Cramer<br>
<b>Sent:</b> Thursday, June 14, 2012 12:54 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> Re: [fdo-internals] FDO RFC 63 In-memory Spatial Index - for review<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I do have more comments, but just have not gotten to reply previously.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Can there be a way to get segment information (at least for line segments) out of the results without having to implement a segment visitor? At least for callers who need XY information (the main mode
of operation for spatial filtering), it only requires two more binary digits (two Boolean values) to encode ordinate order, mapping extents (four doubles in a fixed order) back to the original XY ordinates. Example, one Boolean indicates whether Min X represents
the first X ordinate of the original line segment, and the other Boolean indicates whether the Min Y represents the first Y ordinate of the original line segment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="color:black">In order to retrieve the original XY ordinates they have to be stored into the R-tree. The two booleans are not enough. Regardless, a segment visitor is very fast and in my opinion this extra memory consumption
is not justified.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">The Marker encoding for sub-part and segment index is easy to overflow in Mode 3. A larger result needs to be available, or at least a return value to indicate an overflow. Both can be done, so that
the caller can just call a different method to get the larger result when needed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="color:black">The RFC states the following:<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div style="mso-element:para-border-div;border:solid #D7D7D7 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;background:#F7F7F7;margin-left:28.5pt;margin-right:28.5pt">
<p class="MsoNormal" style="mso-margin-top-alt:12.0pt;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:#F7F7F7;border:none;padding:0in">
<span style="font-size:10.0pt;font-family:"Courier New";color:black">/// In Mode #3 a exception will be thrown in case the encoding fails. In this case Mode #2 can be used instead.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Marker sorting should be supported, especially if #1 above is not supported. It’s just as useful to callers as the DecodeMarker method.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="color:black">Not sure marker sorting fits too well into this RFC. It’s trivial for the client to collect the markers in a standard vector and then call sort().
<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Gavin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> fdo-internals-bounces@lists.osgeo.org [mailto:fdo-internals-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Greg Boone<br>
<b>Sent:</b> Thursday, June 14, 2012 12:34 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> Re: [fdo-internals] FDO RFC 63 In-memory Spatial Index - for review<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">If there are no comments, I would like to request a vote on this RFC.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">+1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Greg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;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> Monday, June 04, 2012 11:42 AM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> [fdo-internals] FDO RFC 63 In-memory Spatial Index - for review<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Please review the proposal for an in-memory Spatial Index.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="http://trac.osgeo.org/fdo/wiki/FDORfc63">http://trac.osgeo.org/fdo/wiki/FDORfc63</a><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks in advance for your feedback,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Dan.<o:p></o:p></span></p>
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