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rr-mapview

How to control the map colors in mapview (package) in R?

I'm working with R as a GIS software, thanks to the mapview,gstat,sp and other packages.

I plot the result with mapView() function

m <- vgm(psill=.49,model="Sph",range=600000,nugget=3.8)
idw <- krige(formula = temp~1, locations = data_test, newdata = grd, model=m)
idw.output = as.data.frame(idw)
names(idw.output)[1:3] <- c("long", "lat", "temp")
coordinates(idw.output) <- ~long+lat
morocco <- readOGR("/opt/lampp/htdocs/ardusky/public/data/TNG", "TNG")
proj4string(idw.output)<-proj4string(morocco)
tempData <- idw.output[morocco,]
proj4string(data_test)<-proj4string(morocco)
gridded(tempData) <- TRUE
m<-mapView(tempData, zcol = "temp") + data_test
m

result:

enter image description here

I want to control the coloration, 0->blue 50->red for example.

there is any way to do that ?

Solution

  • Similar to spplot the at argument in mapview is what you want to use:

    library(mapview)
library(sp)

data(meuse.grid)
coordinates(meuse.grid) <- ~x+y
proj4string(meuse.grid) <- CRS("+init=epsg:28992")
gridded(meuse.grid) <- TRUE

mapview(meuse.grid, zcol = "dist", at = seq(0, 1, 0.25))

    Note: In the CRAN version this only works for Raster* objects, but I assume that is what you are after.