Trying to use geom_grid and also geom

Ista Zahn

2013-04-21 14:41:13 UTC

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Hi,

Post by Diego
Hi! I was trying to plot some data (longitude,latitude,variable) of two
differents years (with geom_grid)

I assume you mean facet_grid here.

and also to import a digital elevation

Post by Diego
model (with geom_tile) as a background image for both panels but I have this
error :Error in eval(expr, envir, enclos) : object 'value' not found. I
attached the code and the data for reproduce it. Somebody can help me
please? Thank in advance.

Sure. The problem is that you map color to value and size to Area in
the ggplot() call, but neither of those variables exist in the DEM
data.frame. My advice in general is to only specify mappings in the
ggplot call that apply to all subsequent geoms, and specify all others
in the individual geom calls. In your example this looks like

a <- ggplot(meltdata[meltdata$Point!='E',],aes(Longitude,Latitude)) +
geom_point(aes(color=value,size=Area)) +
scale_size_area(max_size=10) +
guides(color=guide_legend(override.aes=list(size=10)))
a <- a + facet_grid(variable ~ .)
a <- a + geom_tile(data=DEM,aes(fill=Altitude))

Best,
Ista

Post by Diego
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