[fdo-internals] RE: FDO Function SpatialExtents

[Haris Kurtagic]

Can you help me little more, how to get it from R-TREE ?

I know of SDO_TUNE.Extent_OF which is faster for some types of data.

 

BTW, so far I tested , Map calls it twice, once together with Count,
second time only SpatialExtents.

 

Thanks,

Haris

 

From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Orest
Halustchak
Sent: Monday, November 17, 2008 11:22 PM
To: FDO Internals Mail List
Subject: [fdo-internals] RE: FDO Function SpatialExtents

 

Hi Haris,

 

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.

 

Thanks,

Orest.

 

From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Haris
Kurtagic
Sent: Monday, November 17, 2008 5:36 PM
To: FDO Internals Mail List
Subject: [fdo-internals] FDO Function SpatialExtents

 

Hi,

 

I have implemented support for SelectAggregates in King.Oracle.

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.

 

I have implemented function using Oracle SDO_AGGR_MBR. That is rather
slow process .

What I noticed is that MAP 3D 2009 is calling FDO command
SelectAggregates with SpatialExtents function.

That makes rendering of layers very slow in MAP 3D.

 

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.

 

Thank you,

Haris

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