R – Change columns names in a spatial dataframe
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Ordnance Survey have a great OpenRoads dataset, but unfortunately it contains a column called ‘primary’, which is a keyword in SQL. This makes it challenging/impossible to import the OpenRoads dataset into a SQL database (e.g. GRASS), without changing the offending column name.
Enter R! Or any other capable programming language. The following script reads a folder of shp files, changes a given column name and overwrites the original files. Note the use of the ‘@’ symbol to call a slot from the S4 class object (thanks Stack Exchange).
library(rgdal)
f = list.files("~/Downloads/OS/data", pattern="shp")
f = substr(f, 1, nchar(f) - 4)
lapply(f, function(i){
x = readOGR("/home/mspencer/Downloads/OS/data", i)
colnames(x@data)[11] = "prim"
writeOGR(x,
"/home/mspencer/Downloads/OS/data",
i,
"ESRI Shapefile",
overwrite_layer=T)
})
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