NA values when I rasterize

General
#1

Hello,

How are you? I am getting some problems when I rasterize to a CRS like "+proj=longlat +datum=WGS84 +no_defs"

I have some spatial data in Lambert projection so I am using rasterize to transform to "+proj=longlat +datum=WGS84 +no_defs". I am not sure if this is the best option to make a plot of that spatial data.

I leave here a part of the code:

xyz <- as.matrix(data.frame(x = array(long), y = array(lat), z = array(z)))

se especifica el CRS

#crs.latlon <- CRS("+proj=longlat +datum=WGS84")
crs.latlon <- CRS("+proj=longlat +datum=WGS84 +no_defs")

nrow <- 999
ncol <- 1249

se define el extent del dominio

ext <- extent(xyz[, c("x", "y")])

se crea raster con extent definido por nrow y ncol

rast <- raster(ext = ext, nrow = nrow, ncol = ncol, crs = crs.latlon)

rasterize los datos

rast <- rasterize(xyz[, c("x", "y")], rast,
xyz[, "z"],
fun = mean)

test_spdf <- as(rast, "SpatialPixelsDataFrame")
test_df <- as.data.frame(test_spdf)
colnames(test_df) <- c("value", "lon", "lat")

But then when I make the plot with ggplot I get some NA values in my domain. I leave here some part of the figure:
image

Could you help me to understand what is going on?

Thank you!

Kind regards,
Lorena

#2

I discovered that when the nrow and ncol are set to half I get the plot fixed. Another way is not to set nrow and ncol, bue in that case I get a worst spatial resolution. Someone could help to understand what is going on?

Thank you very much,

Kind regards,
Lorena