Upgrade Problems - Additional Info

[Kralidis,Tom [Burlington]]

> 
> 
> On 10/17/05, Kralidis,Tom [Burlington] <Tom.Kralidis at ec.gc.ca> wrote:
> > Is or has something happened to the way the .ovf or underlying OGR 
> > process handles precision of coordinates when doing spatial filters?
> 
> Tom,
> 
> I haven't dug through the previous emails closely to see what 
> is going on, but I thought I should answer this.
> 
> There has been a substantial improvement in the amount of 
> precision OGR maintains for WKT and GML encodings of 
> geometries.  The changes were applied a couple months ago.  
> They are definately in GDAL/OGR 1.3.1 and might be in 1.3.0.
> 
> OGR spatial filtering will also now use GEOS if built-in.  It 
> is possible that some "on the edge" situations would give 
> different results now compared to in the past.
> 
> I'm not sure if any of this relates to the problem you are 
> seeing though.

Thanks for the info.  I don't think these instances are using WKT/GML as
input or output, if that's what you mean.  Basic .ovf connection to
provide WMS output.  Is there anything we can do on our end to help with
this issue?  The problem is basically:

ENVIRONMENT
===========

OS: Win32
MapServer: 4.6.1 windows dist (non ms4w package from
http://maptools.org/dl)
Layer Data connection: OGR .ovf connection to M$ SQL Server 2000

SCENARIO 1
==========

- invoke OGC:WMS GetMap request against said layer with coordinates
formatted with 8 decimals

http://cabin.cciw.ca/cabin_ows.asp?version=1.1.1&service=WMS&request=Get
Map&layers=CABINPoints&styles=&bbox=-141.00000000,35.18749999,-51.999999
99,90.81250000&format=image/png&srs=EPSG:4326&width=500&height=300

Result: works

SCENARIO 2
==========

- invoke OGC:WMS GetMap request against said layer with coordinates
formatted with 9 decimals

http://cabin.cciw.ca/cabin_ows.asp?version=1.1.1&service=WMS&request=Get
Map&layers=CABINPoints&styles=&bbox=-141.000000002,35.187499998,-51.9999
99997,90.812500001&format=image/png&srs=EPSG:4326&width=500&height=300

Result: watch server timeout ensue

NOTES
=====
- this does not exist when the layer data connection is a shapefile, for
example

..Tom