CODEWITHSUNDEEP
rggplot2
GodinA
GodinA

Reputation: 1093

No gradient of color with geom_raster

I'm trying to plot a raster image (ocean bathymetry) with geom_raster but I'm having a hard time to crack down the code. I would appreciate any help.

I've downloaded the following xyz file (Dropbox link).

SF.bath <- read.table("SF_bath.txt", header=F,col.names=c("lon","lat","z"))
> head(SF.bath)
       lon     lat   z
1 -67.9917 50.9968 757
2 -67.9750 50.9968 693
3 -67.9583 50.9968 673
4 -67.9417 50.9968 769
5 -67.9250 50.9968 761
6 -67.9084 50.9968 733

When I try the following code, the colours do not show on my map?

v <- ggplot(SF.bath, aes(lon, lat,z=z))
print(v + geom_raster(aes(fill=z)) + stat_contour(size=0.2) + scale_fill_gradient("z"))

map

I get the following message: Using alpha as value column: use value_var to override. Any ideas of what might be the problem?

Upvotes: 3

Views: 1162

Answers (1)

daedalus
daedalus

Reputation: 10923

EDITED to emphasize the key answer

The code in the question with the provided dataset achieves the desired result:

plot of SF_bath

After discussion in the comments, the key lesson turns out to be a suggestion that when the system behaves strangely, it may be wise to update.packages() as part of troubleshooting.

Upvotes: 6

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