Dear all,

I'm new to this list and spatial analyses, apologize for any repetition from previous question.
I exported a shapefile from ArcView, representing gap areas on several forest plots. In ArcView, the attribute table (or dbf) sepcifies notably the gap ID and the plot ID. I imported successfully this shapefile in R, using readShapePoly(), however it seem that the plot ID information is no longer available  in the SpatialPolygoneDataFrame object. This raise several questions:

1.       Do I have to name the gaps in function of the plot to not lose this information?
Secondly, I would like to work with individual polygons in each plot.

2.       How to handle single polygon from a polygone list?
Finally, I would like to transform the gaps coordinates (UTM WSG84) in relative coordinates (xy coordinates in the plot 250mx250m).

3.       Does the  function elide() allows to do that? Or any other way to do that?

I spent quite long time looking for tutorials on the web, but couldn't find any. Any suggestion...
Thank you very much for any advice and  help.

Best regards,
Ervan
______________________________________________________________________________

Ervan Rutishauser
PhD student
CIRAD - UMR AMAP
BP 701
97387 Kourou Cedex
tel. 00594.594.32.92.96



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