There is a reason for the Posting Guide requesting that a reproducible
example be offered. There is also a reason for the PG requesting that
you not crosspost to r-help.
http://stackoverflow.com/questions/13549080/antipodal-error-in-great-circles-code
--
David.
On Nov 24, 2012, at 11:04 PM, shabsae wrote:
Hey,
I'm trying to build something like this
http://flowingdata.com/2011/05/11/how-to-map-connections-with-great-circles/
but with my own data in csv files.
The code runs well if I use the same csv files as the author, but
with mine
, this is what I get
*Code*
library(maps)
library(geosphere)
map("world")
xlim <- c(-180.00, 180.00)
ylim <- c(-90.00, 90.00)
map("world", col = "#f2f2f2", fill = TRUE, bg = "white", lwd =
0.05,xlim =
xlim, ylim = ylim)
airports <- read.csv("/Users/shabnam/Desktop/airports.csv",
as.is=TRUE,
header=TRUE)
flights <- read.csv("/Users/shabnam/Desktop/flights.csv", as.is=TRUE,
header=TRUE)
pal <- colorRampPalette(c("#545454", "white"))colors <- pal(100)
map("world", col="#303030", fill=TRUE, bg="black", lwd=0.05,
xlim=xlim,
ylim=ylim)
fsub <- flights[flights$airline == "AA",]
fsub <- fsub[order(fsub$cnt),]
maxcnt <- max(fsub$cnt)
for (j in 1:length(fsub$airline))
{
air1 <- airports[airports$iata == fsub[j,]$airport1,]
air2 <- airports[airports$iata == fsub[j,]$airport2,]
inter <- gcIntermediate(c(air1[1,]$long, air1[1,]$lat),
c(air2[1,]$long,
air2[1,]$lat), n=100, addStartEnd=TRUE)
colindex <- round( (fsub[j,]$cnt / maxcnt) * length(colors) )
lines(inter, col=colors[colindex], lwd=0.8)
}
David Winsemius, MD
Alameda, CA, USA
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