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<body lang=EN-US link=blue vlink=purple><p><font size=2 color=navy face=Arial>
Oracle saves the root mbr in one of the metadata tables. I don't have access at the moment to check.<br><br>Orest.<br>
<br>--------------------------
<br>Sent from my BlackBerry Wireless Handheld
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<b>From</b>: fdo-internals-bounces@lists.osgeo.org <fdo-internals-bounces@lists.osgeo.org>
<br><b>To</b>: FDO Internals Mail List <fdo-internals@lists.osgeo.org>
<br><b>Sent</b>: Mon Nov 17 14:54:09 2008<br><b>Subject</b>: RE: [fdo-internals] RE: FDO Function SpatialExtents
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<p class=MsoNormal><span style='color:#1F497D'>Can you help me little more, how
to get it from R-TREE ?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I know of SDO_TUNE.Extent_OF which
is faster for some types of data.<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'>BTW, so far I tested , Map calls
it twice, once together with Count, second time only SpatialExtents.<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'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<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>Orest
Halustchak<br>
<b>Sent:</b> Monday, November 17, 2008 11:22 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> [fdo-internals] RE: FDO Function SpatialExtents<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 Haris,<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'>Map3D asks for the spatial extents
first before fetching any of the geometry. The spatial extents will define the
extents of the window. The spatial extents function needs to be very quick in
this case. For Oracle, you could get it from the r-tree.<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'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Orest.<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>Haris
Kurtagic<br>
<b>Sent:</b> Monday, November 17, 2008 5:36 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> [fdo-internals] FDO Function SpatialExtents<o:p></o:p></span></p>
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<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>I have implemented support for SelectAggregates in
King.Oracle.<o:p></o:p></p>
<p class=MsoNormal>I am testing SpatialExtent function and I need help in
understanding how clients, MAP 3D , is using it. I am not sure if I understand
how is it supposed to be used.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have implemented function using Oracle SDO_AGGR_MBR. That
is rather slow process .<o:p></o:p></p>
<p class=MsoNormal>What I noticed is that MAP 3D 2009 is calling FDO command
SelectAggregates with SpatialExtents function.<o:p></o:p></p>
<p class=MsoNormal>That makes rendering of layers very slow in MAP 3D.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I know I am asking about non-open source client like MAP 3D
but from what I see makes me wonder if I understand SpatialExtents function
correctly.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thank you,<o:p></o:p></p>
<p class=MsoNormal>Haris<o:p></o:p></p>
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