Writing SpatialPolygonsDataFrame object to an ESRI Shape File format? `

Wed, Dec 21, 2005 11:53 AM #

Thanks for earlier help finding the new SpatialPolygons classes..
My final (for now) question, that I can't answer from various
documents is:

How to write my SpatialxxxxDataFrame object to an ESRI Shape File?

the previous method I used was:

writeSRDFShape(SRDF, OutputShapeFileRoot)

I have both a SpatialPolygon and SpatialPolygonDataFrame objects to use
as input...

Thanks, RR

Rick Reeves	
Scientific ProgrammerAnalyst
National Center for Ecological Analysis and Synthesis (NCEAS)
University of California, Santa Barbara
reeves at nceas.ucsb.edu
805 892 2533

Roger Bivand

Wed, Dec 21, 2005 12:31 PM #

On Wed, 21 Dec 2005, Rick Reeves wrote:

The functions are wrappers in maptools using sp classes, but because 
shapefiles have to have dbf, the easy wrapper takes a 
SpatialPolygonDataFrame object:

writePolyShape(obj, file="whatever")

with reading now being readShapePoly()

We haven't managed to write a correct *.prj file yet, but would like to - 
I think the code is in GDAL and PROJ.4 with examples in GRASS, but I 
haven't done it - help would be welcome!

Best wishes,

Roger

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