[gdal-dev] RFC 29: OGR Set Desired Fields

[Jez Walters]

Frank,


I'm only concerned with ogr2ogr and how it works with OS MasterMap chunked data - which I'm currently finding a bit slow.  I'll gladly leave the development of anything else to those who understand much more than me!  :-)


Regards,


Jez


-----Original Message-----
From: Frank Warmerdam [mailto:warmerdam at pobox.com] 
Sent: Wednesday 21 July 2010 16:18
To: Jez Walters
Cc: 'gdal-dev at lists.osgeo.org'; 'Martin Dobias'
Subject: Re: [gdal-dev] RFC 29: OGR Set Desired Fields

Jez Walters wrote:
> Frank,
> 
> 
> If we "connect this to the -select option of ogr2ogr" as you suggest, it
> would probably be helpful to specify fields by name rather than by number in
> order to accommodate the OS MasterMap data.
 >
> At the risk of repeating myself from another thread, the OS MasterMap
> Topology Layer vector data has identical field names (for any given layer)
> in all data chunks, but the field numbers are different in different chunks.
> Just to complicate matters, some fields are entirely missing in some data
> chunks too!  :-(

Jez,

With all due respect:

  o The -select already uses names, which can be internally converted
    to field indexes within ogr2ogr.  Users don't ever give numbers for
    fields.
  o Within *one* layer the fields are consistent.  I don't think the
    issue with different field lists and ordering between gml files
    has any real bearing on the "set desired fields" RFC.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent



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