Created
December 2, 2011 00:56
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Bug in geom_raster?
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# I've been testing Hadley's last dev version of ggplot2 - my interest being mainly triggered | |
# by the new and shiny geom_raster(), as I'm still convinced a mapping framework based on | |
# ggplot2 would just be awesome to see (fast and easy production of very nice looking maps). | |
# | |
# Somehow I managed to test it using a simple coercition of the SpatialPixelsDataFrame objects | |
# into data.frames, but for some reasons it seems to be handling the coordinates on a weird way. | |
# | |
# Is that a bug? | |
# | |
library(sp) | |
# Loading demo data | |
data(meuse.grid) | |
coordinates(meuse.grid) <- ~x+y | |
proj4string(meuse.grid) <- CRS("+init=epsg:28992") | |
gridded(meuse.grid) <- TRUE | |
# Reference plot | |
spplot(muse.grid, zcol = "dist") | |
# Coercition into data.frame | |
mgdf <- as.data.frame(meuse.grid) | |
head(mgdf) | |
# ggplot2 plot | |
ggplot(mgdf, aes(x = x, y = y)) + geom_raster(aes(fill = dist)) | |
# Looking into the coordinates of mgdf to check this is not as.data.frame() | |
plot(mgdf$x, mgdf$y, pch = "+", asp = 1) |
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