列重新排列 csv 文件 R 或 Excel

Question

I have 2 data sets with the exact same coordinates that I am trying to merge into 1 by rearranging the coordinates to match while shifting the data with it. One set has coordinates associated with bioclim variables and another has the same coordinates associated with land ownership, but these coordinates are out of order (thank you GIS for the mixaro). Any tips on how to rearrange it so the coordinates line up for easy dataset manipulation? I was trying to do this in excel but if anyone knows an R trick that would be super! ((Data pic example in the link))

Answer 1

You should use R data.table and merge the two tables by latitude and longitude.

library(data.table)
dt1=data.table(df1)
dt2=data.table(df2)
# converting the lat-long columns to characters
dt1[,`:=`(LATITUDE=as.character(LATITUDE), LONGITUDE=as.character(LONGITUDE))]

dt1[dt2,on=c("LATITUDE","LONGITUDE")]

• performs a left join

OR

dt=merge(dt1,dt2,by=c("LATITUDE","LONGITUDE"),all=T)

• by takes the column to merge upon
• all=T performs an outer join
• Check the documentation of datatable merge for use of other parameters.https://www.rdocumentation.org/packages/data.table/versions/1.13.0/topics/merge