Hi Tim,
I don't know the answer to your problem, but I do know that you might
consider reposting this question to the r-sig-geo mailing list. There
you will find a geographically oriented audience, which will probably
lead to better and faster answers.
cheers,
Paul
Tim Clark wrote:
Dear List,
I am analyzing the home range area of fish and seem to have lost the
individuals ID names during my manipulations, and can't find out how to rename
them. I calculated the MCP of the fish using mcp() in Adehabitat. MCP's were
converted to spatial points data frame and exported to qGIS for manipulations.
At this point the ID names were lost. I brought the manipulated shapefiles
back into qGIS, but can't figure out how to rename the individuals.
#Calculate MCP and save as a shapefile
my.mcp<-mcp(xy, id=id, percent=100)
spol<-area2spol(my.mcp)
spdf <- SpatialPolygonsDataFrame(spol, data=data.frame
+(getSpPPolygonsLabptSlots(spol),
+row.names=getSpPPolygonsIDSlots(spol)), match.ID = TRUE)
writeOGR(spdf,dsn=mcp.dir,layer="All Mantas MCP", driver="ESRI
+Shapefile")
#Read shapefile manipulated in qGIS
mymcp<-readOGR(dsn=mcp.dir,layer="All mantas MCP land differenc")
My spatial points data frame has a number of "Slot"s, including one that contained the original names called Slot "ID". However, I can not access this slot using slot() or slotNames().
slotNames(mymcp)
[1] "data" "polygons" "plotOrder" "bbox" "proj4string"
What am I missing here? Is Slot "ID" not a slot? Can I export the ID's with
the shapefiles to qGIS? Can I rename the ID's when I bring them back into R? When is a
slot not a slot()?
Thanks,
TIm
Tim Clark
Department of Zoology
University of Hawaii
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Department of Physical Geography
Faculty of Geosciences
University of Utrecht
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