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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