Dear R users,
I need to produce rainfall maps using R.
I know that this is possible, I looked though the web, I found the example
below reported (the author is Andrew Tredennick).
I would ask you if this is the most performing way to make rainfall maps; if
yes would someone be able to give me an example of how file.asc and
pointfile.csv should be? If no would somebody please show me another way
providing a small example?
Thank you for your help
Stefano
library(raster)
library(ggplot2)
#open ASCII file using �raster� command, which converts the ASCII to a raster
object
map <- raster(�/your/path/to/file.asc�)
#convert the raster to points for plotting
map.p <- rasterToPoints(map)
#Make the points a dataframe for ggplot
df <- data.frame(map.p)
#Make appropriate column headings
colnames(df) <- c(�Longitude�, �Latitude�, �MAP�)
#Call in point data, in this case a fake transect (csv file with lat and lon
coordinates)
sites <- data.frame(read.csv(�/your/path/to/pointfile.csv�))
#Now make the map
ggplot(data=df, aes(y=Latitude, x=Longitude)) +
geom_raster(aes(fill=MAP)) +
geom_point(data=sites, aes(x=x, y=y), color=�white�, size=3, shape=4) +
theme_bw() +
coord_equal() +
scale_fill_gradient(�MAP (mm/yr)�, limits=c(0,2500)) +
theme(axis.title.x = element_text(size=16),
axis.title.y = element_text(size=16, angle=90),
axis.text.x = element_text(size=14),
axis.text.y = element_text(size=14),
panel.grid.major = element_blank(),
panel.grid.minor = element_blank(),
legend.position = �right�,
legend.key = element_blank()
)
(oo)
--oOO--( )--OOo----------------
Stefano Sofia PhD
Area Meteorologica e Area nivologica - Centro Funzionale
Servizio Protezione Civile - Regione Marche
Via del Colle Ameno 5
60126 Torrette di Ancona, Ancona
Uff: 071 806 7743
E-mail: [email protected]
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