cshp {cshapes} | R Documentation |
The cshp
function makes the cshapes dataset available for usage in R. If no date is given, it returns a SpatialPolygonsDataFrame
with the complete CShapes dataset. If specified, the date is used to create a snapshot of the dataset, containing all cshapes polygons active at the given date.
cshp(date=NA)
date |
The date for which the cshapes polygons should be extracted. This argument must be of type Date and must be in the range 1/1/1946 - 30/6/2008. If omitted, the complete dataset is returned. |
A SpatialPolygonsDataFrame
, containing the complete CShapes dataset, or the CShapes snapshot for the specified date.
Nils B. Weidmann
# Retrieve the dataset cshp.data <- cshp() # Get summary statistics summary(cshp.data) # Extract Switzerland switzerland <- cshp.data[cshp.data$COWCODE==225,] # Plot Switzerland plot(switzerland) # Extract a snapshot of cshapes as of June 30, 2002 cshp.2002 <- cshp(date=as.Date("2002-6-30"))