[fdo-users] MapInfo provider

[Kenneth Skovhede, GEOGRAF A/S]

Frank Warmerdam skrev:
> On Wed, Mar 25, 2009 at 10:49 AM, Kenneth Skovhede, GEOGRAF A/S
> <ks at geograf.dk> wrote:
>   
>> That depends on what you want to accomplish.
>>
>> I find that speed is very good, even better than SDF when using TAB files.
>> All the data I have tested with renders fine, but date/time columns are not
>> supported.
>>     
>
> Folks,
>
> I do believe that date/time support has been incorporated into MITAB and
> the OGR bindings in recent versions of OGR.  If not it might be worth
> filing a ticket on this.  Does the OGR FDO provider support date/time fields?
> They are a relatively recent addition to OGR.
>
>   
I'm using GDAL 1.4, so date/time columns might work with a more recent 
OGR/GDAL version.
>> But, the OGR only supports a geometry and a single logical expression.
>> It would be cool to have it support arbitrary FDO expressions.
>> If that is your target, I belive some of the other providers have much of
>> the logic for this,
>> and that it would be a better solution than a pure MI provider.
>>     
>
> Is this an improvement that can be done right in the FDO OGR provider?
>
>   
Yes, to simplify the development, the FDO OGR provider does not parse 
full FDO statements, but
looks for a statement tree like: "<geom filter> AND <logical expr>" and 
supports either side missing
or swapped, but nothing else.

I have wanted to build full support for FDO expressions, but have not 
had the time or FDO knowledge to do so yet.
> Overall, I'd prefer to see the requirement for good mapinfo support drive
> improvements to the FDO OGR provider (and perhaps OGR/MITAB)
> rather than do something really custom.
>   
I support that idea.
> Best regards,
>   
-- 
Regards, Kenneth Skovhede, GEOGRAF A/S

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/fdo-users/attachments/20090326/b66bc876/attachment.html