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copied!<p>I would check the data you are trying to convert. I was not able to access the data you have in your example so I just used the first 3 coordinate points you provided to try to replicate the error and did not get an error. I also checked to see if the error could be caused by having the UTM zone specified not include all points provided by changing the zone number and north/south parameter and still everything worked. I would perhaps create a loop that iterates through the data you want to convert in chunks to see where the problem lies... </p> <pre><code>library(rgdal) GPS.Points=data.frame(Longitude=c(23.85474, 23.85531, 23.85534)) GPS.Points=cbind(GPS.Points,Latitude=c(-19.52211, -19.52243, -19.52257)) GPS.Points.Spatial.Data <- SpatialPoints(GPS.Points, proj4string=CRS("+proj=longlat +ellps=WGS84")) GPS.Points.Spatial.Data[1] class(GPS.Points.Spatial.Data) GPS.Points.UTM.Spatial.Data <- spTransform(GPS.Points.Spatial.Data, CRS("+proj=utm +south +zone=34 +ellps=WGS84")) </code></pre> <p>Since you asked, here is a code to iterate through parts of the data. If you get an error you will at least know where in your data the problem came from:</p> <pre><code>library(rgdal) GPS.Points=data.frame(Longitude=c(23.85474, 23.85531, 23.85534, 23.85474, 23.85531, 23.85534, 23.85474, 23.85531, 23.85534)) GPS.Points=cbind(GPS.Points,Latitude=c(-19.52211, -19.52243, -19.52257, -19.52211, -19.52243, -19.52257, -19.52211, -19.52243, -19.52257)) n_chunks=3 #number of pieces you will break you data into n.points=dim(GPS.Points)[1] breaks=seq(1,n.points, by=round(n.points/n_chunks)) breaks=c(breaks, n.points) #make sure to include last points as well i=1 for (i in 1:(length(breaks)-1)){ cat('\n','converting points', breaks[i], "to", breaks[i+1]) temp.GPS.Points=GPS.Points[breaks[i]:breaks[i+1],] temp.GPS.Points.Spatial.Data <- SpatialPoints(temp.GPS.Points, proj4string=CRS("+proj=longlat +ellps=WGS84")) temp.GPS.Points.UTM.Spatial.Data <- spTransform(temp.GPS.Points.Spatial.Data, CRS("+proj=utm +south +zone=34 +ellps=WGS84")) } </code></pre>

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