[R-sig-Geo] as.im in spatstat::ppm not working as before

[Alexandre Santos]

Dear Members,

I'll calculate some old codes for a paper review, and I'm astonished that as.im() for fitting the Poisson model is not working as before. In my example:

library(raster)
library(spatstat)


# Elevation
r.grid.world <- raster('https://raw.githubusercontent.com/Leprechault/trash/main/wc2.1_10m_elev.tif')
proj4string(r.grid.world) <- CRS("+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0")
r.grid.world.SGDF.F <- as(r.grid.world, "SpatialGridDataFrame")


#Fitting Poisson model
fit.c <- ppm(nztrees, ~ elev,
covariates=list(elev=as.im(r.grid.world.SGDF.F[[1]])))
#
# Error in as.im.default(r.grid.world.SGDF.F[[1]]) : 
#   Can't convert X to a pixel image

I tried as matrix and rotate, and the final real-valued pixel image didn't work as a covariate in the model. 

Please, any help with it?

Thanks in advance

Alexandre