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Created September 2, 2015 16:16
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r-snippets.md

Useful R

GEO stuff

library(rgdal)
library(maptools)

Defining projections

proj <- CRS('+proj=aea +lat_1=29.5 +lat_2=45.5 ...')
latlon <- CRS("+proj=longlat +datum=WGS84")

Converting a data frame with lat lon into a geo data set

data <- read.csv('list-of-points.csv')
# define the columns that contain the coordinates 
coordinates(data) <- c('lat', 'lon')
# and specify the source projection, usually wgs84 latlon
proj4string(data) <- latlon

Re-projecting a dataset

data <- spTransform(data, proj)

Store as point shapefile

writePointsShape(data, 'points.shp')
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