ggplot2 - R raster plot non-continuous color scale -


OK, so I'm getting an epic brain on it, so any help would be appreciated. I am plotting the data using raster and ggplot. Below I am an example to produce that figure: 

  r = raster (ncol = 18, nrow = 18, xmn = -120, xmx = -80, ymn = 10, ymx = 45) outline = as.data.frame (map ("world", xlim = c (-120, -80), ylim = c (10, 45), Plot = wrong) [c ("x", "y")] = map (geo_path (aes (x, y), inherit.aes = FALSE, data = outline, alpha = 0.8, show_guide = FALSE, color = " Gray ") lat = runif (10, 10,45) lon = Ranif (10, -120, -80) data = ranif (10, -3,2) xy = cbind (x = lan, y = lat) dummy = Rasterize (xi, r, field = data, fun = Cited) dummy .df = as.data.frame (dummy, row.Name = NULL, alternative = true, xy = TRUE, centroids = TRUE) colnames (dummy.df) & lt; -c ("lon", "lat "Data") Ggplot (data = dummy.df, AES (x = lawn, y = axis)) + gOm_tile (AES (fill = data)) + scale_colour_brewer (palette = "set1")  < / Pre> 
 What is the problem with me, it's the continuous color scale that uses it I have seen everywhere, but nothing can be found for my issue (or at least I spent seeing it 6) Could not get in hours). What do I want to have a color scale, using the example given above, between the values ​​of 3 and -2.5, the value of the data will be yellow, between -2.5 and -2.0, orange, -2.0 and -1.5 and yellow Kind . I'm not dead on using scale_colour_brewer, so any suggestions will be appreciated and I will be excluded from my misery. Thanks!

There were some errors, I did not know which package function was map So I do not understand what this answer is for you. 

  Library (GG Plot 2) Library (Raster) Library (Arcolterbrower) R = Raster (nucleus = 18, enro = 18, xmn = -120, xmx = -80, ymn = 10, ymx = 45) Profile = as.data.frame (Map ("World", xlim = c (-120, -80), ylim = c (10, 45), Plot = FALSE) [c ("x", "y ")] Map = geom_path (aes (x, y), inherit.aes = FALSE, data = outline, alpha = 0.8, show_guide = FALSE, color =" gray ") Lat = runif (10, 10,45) lon = Runif (10, -120, -80) data = ranif (10, -3,2) xy = cbind (x = lan, y = lat) dummy = rastise (xy, r, field = data, fun = mean) Dummy.df = as.data.frame (dummy, row.Name = NULL, alternative = TRUE, xy = TRUE, centroids = TRUE) colnames (dummy.df) & lt; - c ("lon", "lat", "data") breaks 2 & lt; -seq (-2.5,2,0.5) dummy D $$ Colonel & lt; -s.character (cut (dummy.df $ data, break = breaks2)) dummy.df $ Col [is.na (dummy.df $ Col)] & ​​lt; - "Empty" # This palette does not have enouth color, so I added green color & lt; -c (brewer.pal (9, "set 1"), "green") name (color) & lt; - Unique (dummy.df $ Col) color + "Grey40" ggplot (data = dummy.df, aes (x = lon, y = lat)) + geom_tile (aes (fill = col)) + scale_fill_manual (values ​​= C (colors))

You can choose the color manually

You can choose the color manually, but you must give them the proper name


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