ogr user wrote:
This patch does not do anything regarding direction of winding.
What it does is - discover the exterior ring for a polygon, and make it
the first ring in the polygon object. This was in response to your
earlier comment that said "The S-57 driver uses
OGRBuildPolygonFromEdges() to form the set of lines into a polygon. No
effort is currently made to properly represent exterior vs. interior
rings as is required by the simple features geometry specification."
This is that effort. FWIW, with this patch, polygons read from ENC data
that were assembled "out of order" (i.e. exterior ring was assembled
later than a first one) would be rearranged (in that exterior ring is
found and made the "exterior" ring) so that they could be drawn/handled
correctly using OGR geometry.
Mike,
This would indeed be a useful change. I'd encourage you to file it in Trac
and I'll look at incorporating it.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmer...@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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