[FWTools] ogr2ogr shp --> kml conversion failing on some complicated polygons

[Lennox Antoine]

You are probably experiencing a tesselation problem. Here is a polygon
template I normally use for filling complex polygons in GE. Note the
tesselation attribute, and how to use it.

<Polygon>
  <extrude>0</extrude>
  <altitudeMode>clampToGround</altitudeMode>
  <tessellate>1</tessellate>
  <outerBoundaryIs>
     <LinearRing><coordinates></coordinates></LinearRing>
  </outerBoundaryIs>
</Polygon>

<Style>
  <LineStyle>
    <color></color>
    <width></width>
  </LineStyle>
  <PolyStyle>
    <fill>1</fill>
    <color></color>
  </PolyStyle>
</Style>

-Lennox

On 4/8/07, Bryan Keith <bryan at geomega.com> wrote:
>
> Hello,
>
> I have a shapefile with a single record, a polygon shape.  I tried
> attaching the shapefile to this e-mail, but the server didn't like it.
> I'll gladly e-mail the shapefile to anyone who's willing to look into
> this.  It's ~722KB.  I can convert the shapefile to kml like this:
>
> ogr2ogr -f kml testblm_py.kml testblm_py.shp
>
> When I look at the kml in Google Earth, it looks fine.  The outline of
> the shapefile shows up as a red line which, I guess, is the default for
> ogr2ogr kml output.  However, I want to see filled polygons so I replace
> part of the "style" line in the kml like this:
>
> cat testblm_py.kml | sed "s/<fill>0<\/fill>/<color>ff37d9f0<\/color>/" >
> testblmfill_py.kml
>
> The shaded area does not show up correctly in Google Earth.  It shows up
> as lots of vertical striped areas within the polygon.
>
> My actual workflow is a fair bit different from what I've described
> here, but I've tried to boil the problem down to a simple example.  I
> realize, however, that this polygon is not simple.  I'm processing over
> 10000 land ownership polygons in Utah, and I'm only having a problem
> with a few of the big, complicated polygons.
>
> I'm wondering if it might be a problem with the line length in the kml,
> but I'm not sure.  I'm still doing some testing.  Any ideas are
> appreciated.
>
> Bryan
>
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