Have you tried
readShapePoints
writePointsShape
both in maptools.
Also, I don't think you really need a proj4string specified unless
you are actually doing some spatial operations such as buffers and
distances.
I take it that you have already considered and discarded the
possibility of using using a unique ID for the tax records and after
the analysis in R just joining the resulting table in a GIS to your
original shapefile.
Nikhil
On 28 Oct 2009, at 1:33PM, PDXRugger wrote:
Hello R Community,
I have imported a dataset which contain X Y coordinates and would
like to
recreate a shape file after some data analysis. What i have done is
to
import some taxlot data and join them based on some criteria. I
want to
check to see how well the joining went by reviewing the results in
GIS.
A couple things. I cant seem to import a shape file correctly using
the
maptools package and the readShapeSpatial. I have tried
Building=file("data/input/BuildingShape/Building.shp")
Bldg<-readShapeSpatial(fn=data/input/BuildingShape/
Building,proj4string=NAD83)
#----------------------
Bldg<-readShapeSpatial(data/input/BuildingShape/
Building,proj4string=NAD83)
#---------------
Building=file("data/input/BuildingShape/Building.shp")
Bldg<-readShapeSpatial(Building,proj4string=NAD83)
I know i am mis interpreting the documentation but it doesnt seem
like it is
very complicated so i am of course confused.
Also, i am wondering if i can create a shape file by simply using XY
coordinates from a data frame.
So for:
Ycoord=c( 865296.4, 865151.5, 865457.0 ,865363.4 ,865311.0, 865260.9
,865210.7 ,865173.3,
865123.6 ,865038.2 ,864841.1 ,864745.4 ,864429.1 ,864795.6 ,864334.9
,864882.0)
Xcoord=c( 4227640 ,4227816 ,4228929 ,4228508 ,4229569 ,4229498 ,
4226747,
4226781, 4229597,
4229204, 4228910, 4228959 ,4229465 ,4229794 ,4229596 ,4229082)
Lot<-c(1900 , 2000, 2100 , 100 ,200 , 300, 400 , 500 ,
600 , 701 ,
900 , 1000 , 1100,
300 ,100, 200)
XYcoord<-spCbind(Ycoord,Xcoord) #doesnt work so
XYcoord=c(Ycoord,Xcoord)
TaxLots<-cbind(Ycoord,Xcoord,Lot)
writeSpatialShape(XYcoord, TaxLots..,
file=data/input/test/Taxlots,strictFilename=FALSE)
So help reading in shape files and then creating them using XY
coordinates
if possible
Any help would be appreciated. Thank you.
--
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