Hi Pilar,I had to do the same recently and find the shortest distance from a point to a line. The solution I chose was to point sample the line and then find the nearest point from the sample. You can work with spsample() and spDistN1().
Here's the bit that did it for me (it can be written shorter):
tempPoints <- spsample(<Line>, n=samplesize, type="regular") # sample it at an interval
tempPoints<- as.matrix(as.data.frame(tempPoints)) #get their coordinatesdists <- as.data.frame(cbind(Longitude=tempPoints[,1], Latitude=tempPoints[,2], distance=spDistsN1(as.matrix(tempPoints), c(<POF_Long>, <POF_Lat>), longlat=FALSE))) #calculate the distances of the point of interest from the sample points on the segment
dists <- dists[order(dists$distance),] #sort by distanceP1 <- dists[1,c("Longitude", "Latitude")] # get the closest point on the segment to the watch site
hth Kami Pilar Tugores Ferra wrote:
Hi list! I need computing shortest distance from points to a polyline layer (coast line).I've been searching all the morning a function in R that can do this but couldn't find anything! Is there any R function that do this? Or can anybody give me some hint about how it could be done?Kind regards! Pilar Mª Pilar Tugores Ferrà PhD Student Instituto Español de Oceanografía Centro Oceanográfico de Baleares Muelle de Poniente s/n 07015 Palma de Mallorca Baleares, España Telf.: (34) 971 401561 La información contenida en este e-mail y sus ficheros adjuntos es totalmente confidencial y no debería ser usado si no fuera usted alguno de los destinatarios. Si ha recibido este e-mail por error, por favor avise al remitente y bórrelo de su buzón o de cualquier otro medio de almacenamiento. This email is confidential and should not be used by anyone who is not the original intended recipient. If you have received this e-mail in error please inform the sender and delete it from your mailbox or any other storage mechanism. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
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