[R-sig-Geo] how to show polygons from e00 file (Grauss-Krüger coordinatensystem) in Google map?

[Paul Hiemstra]

Hi,

You have to do two things, read your data and export it to a format for 
Google Earth.

The Cran Spatial Taskview suggests the RArcInfo package to read the e00 
files into R. I'm not sure into what format they are loaded. Maybe 
readOGR from the rgdal package can also read e00 files, depending on the 
GDAL/OGR version you have available.

If you have your vector file in an R session in a SpatialPolygons object 
(see the sp-package), the following code shows an example how to export 
the data to a format that Google Earth can read:

library(rgdal)
data(meuse)
coordinates(meuse) = ~x+y
proj4string(meuse) = CRS("+init=epsg:28992")
proj4string(meuse)
meuse.ll = spTransform(meuse, CRS("+proj=longlat"))
writeOGR(meuse.ll, "meuse.kml", "meuse.kml", driver="KML")

I'm not sure if the RArcInfo reads the e00 file into a SpatialPolygons 
object (Virgillio?), or if it is easy to convert the output from 
RArcInfo to an sp-class. rgdal always reads data into an sp-class, but 
I'm not sure if this supports the e00 format.

I hope this e-mail provides you with some clues to work with,

cheers and good luck with your thesis,
Paul

Jian Li wrote:
>
>
>
>
>
> Dear r-sig-geo Members,
>
> recently, I've been trying to display the information from a e00 file (Grauss-Krüger coordinatensystem) in Google map but until now no success.    
>
> I would be very appreciated if anyone can help me to solve the problem which directly concerns my master thesis.
>
> e00 file is under http://jaguar.biologie.hu-berlin.de/~jian/phpMysqlGoogle/nat.e00 available
>
> Thank you in Advanced
>
> Best Regards,
> Jian  
>
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul