[fdo-internals] RE: FDO Function SpatialExtents

[Orest Halustchak]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/fdo-internals/attachments/20081117/bf378f59/attachment.html