rgdal writeOGR, KML examples

Dear all,
I was wondering if anyone has a few more examples on creating KML files with
the fantastic writeOGR() function in the rgdal package. The meuse example is
great but I am particularly interested in modifying some of the simple style
attributes (marker size, type, etc..) in the resulting kml files. Is that
possible at all via writeOGR(..., , driver="KML") ?

What is possible in writeOGR() is what is possible in the OGR driver, so 
please refer to:

http://www.gdal.org/ogr/drv_kml.html

You will see that there is "little support" for formatting, but as the 
driver documentation says, try a few simple test files to see what can be 
done. Alternatives not using this driver are kmlLine() and kmlPolygon() in 
maptools, which may permit more customising, or the GE_SpatialGrid() and 
kmlOverlay() tandem in maptools for making an image overlay. This permits 
arbitrary R symbology, but no querying in GE.

Hope this helps,

Roger

Thanks !

Markus Loecher

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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no

What is possible in writeOGR() is what is possible in the OGR driver, so
please refer to:

http://www.gdal.org/ogr/drv_kml.html

You will see that there is "little support" for formatting, but as the
driver documentation says, try a few simple test files to see what can be
done. Alternatives not using this driver are kmlLine() and kmlPolygon() in
maptools, which may permit more customising, or the GE_SpatialGrid() and
kmlOverlay() tandem in maptools for making an image overlay. This permits
arbitrary R symbology, but no querying in GE.

Another possibility when you want total flexibility in your KML
output is to roll-your-own conversion, using the 'brew' package. This
lets you set up a template with embedded chunks of R code. You'll need
to understand the KML file format, of course, but that's quite simple
and well documented.

You can use the standard KML conversion functions to give you a head
start. Do a 'writeOGR' on your data for starters, then edit the KML
and spot the bit that recurs for each point or polygon. Put one copy
of that section in a loop and save as a brew template. Add salt,
pepper, and cook for five minutes.

Barry

[once again apologies for sending this with the wrong 'From:' address
first time]

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