[gdal-dev] Geometry as EWKB (PostGIS)

[Paul Ramsey]

I'll read closer. Indeed, I see EWKBToGeometry is already there.
However, I'm pretty sure that feature *creation* still uses WKT, which
would explain the drift in my round-trip case. So, a different patch
:) that should not require any guidance about where's and how's.
Thanks Frank,
P.

On Wed, Jun 29, 2011 at 1:04 PM, Frank Warmerdam <warmerdam at pobox.com> wrote:
> On 11-06-29 03:56 PM, Paul Ramsey wrote:
>>
>> Hi all (Evan!):
>>
>> In my FGDB project, the participants compared a file I generated with
>> FGDB>PostGIS>FGDB and noticed that the coordinates had drifted a
>> little in some cases. Turns out, the PostGIS OGR driver using WKT as
>> the transit format, so that's allowing occasional coordinate drift.
>> I'd like to write up an EWKB encoder for OGR geometries (or maybe add
>> an option to the current encoder to generate EWKB?). Could you
>> recommend whether I should do another big utility method like the
>> shapeBuffer code, or a method on the OGRGeometry? whether you prefer
>> an alteration to existing WKB writer or a separate code path?
>>
>> I want to avoid what happened last time, having to re-jig the whole
>> thing at the end.
>
> Paul,
>
> I think, perhaps, that in trunk and perhaps 1.8.0 EWKB is already used.
> I based this partly on the following changeset.  I imagine Even will fill
> in the details.
>
>  http://trac.osgeo.org/gdal/changeset/20697/trunk/gdal/ogr/ogrsf_frmts/pg
>
> 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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