Hi, I have in a matrix 1 255 153 rows and corresponding to the coordinates of burned pixels on 10 years. The coordinates are in UTM. I want to know the pixels burned several times on the 10 years. However, less 1% of my pixels were burned on the 10 years. It seems false. My code uses the center of pixels, in this case, a same area can burn several times in the 10 years, but because the center of pixels differ little one year to another, the code will not show correctly me the pixels which burn each year. Because the code required that the pixels have EXACTELY the same cordinates. Do you known a solution with R to resolve this problem? My Code:
redon<-read.table("C:\\Users\\Documents\\\\PixelFire.txt",sep="",dec=",",header=TRUE)
XY <- redon[c("X", "Y")]
Z<-xtabs(~apply(XY,1,paste,collapse="-"))
Z2<-matrix(unlist(strsplit(names(Z),"-")),ncol=2,byrow=T)
Matrice<-data.frame(Z2,freq=Z[])
write.table(Matrice,"C:\\Users\\Desktop\\Matrice.txt",sep=" ")
Sorry for my bad English! Thank you in advance -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/redundancy-of-coordinates-of-pixels-tp7169408p7169408.html Sent from the R-sig-geo mailing list archive at Nabble.com.