On 11/05/2024 10:21, Roozbeh Valavi wrote:
This might also help:
the solution below will not raise the error if x has geographic
(unprojected) coordinates, a case for which you should not use spatstat.
library(spatstat)
library(terra)
.raster_to_im <- function(x){
r <- as.data.frame(x, xy = TRUE)
im <- spatstat.geom::as.im <http://as.im>(r) return(im)
}
# to generalise the spatstat.geom::as.im <http://as.im> to SpatRaster
and RasterLayer
as.im.SpatRaster <- function(x){ .raster_to_im(x) } as.im.RasterLayer <-
function(x){ .raster_to_im(x) }
I haven’t used it in a while so there might be a direct support in the
spatstat.geom now!
Roozbeh Valavi,
Biodiversity Modeller & Spatial Ecologist
Senior Research Scientist | CSIRO Environment, VIC, Australia
*Twitter*:@ValaviRoozbeh | ResearchGate
<https://www.researchgate.net/profile/Roozbeh-Valavi> | Google Scholar
<https://scholar.google.co.uk/citations?user=3m0jCHwAAAAJ&hl=en&oi=ao>
On Wed, 8 May 2024 at 7:41 PM, Roger Bivand <roger.biv...@nhh.no
<mailto:roger.biv...@nhh.no>> wrote:
as.im <http://as.im>() was in maptools, which was retired last year.
If you need to recreate old work, install maptools from source from
the CRAN package archive
https://cran.r-project.org/src/contrib/Archive/maptools/
<https://cran.r-project.org/src/contrib/Archive/maptools/>.
For non-archival work, update the workflow. See also
https://github.com/r-spatial/evolution/issues/8
<https://github.com/r-spatial/evolution/issues/8>.
Hope this clarifies,
Roger
---
Roger Bivand
Emeritus Professor
Department of Economics
Norwegian School of Economics, Bergen, Norway
________________________________
Fra: R-sig-Geo <r-sig-geo-boun...@r-project.org
<mailto:r-sig-geo-boun...@r-project.org>> på vegne av Edzer Pebesma
<edzer.pebe...@uni-muenster.de <mailto:edzer.pebe...@uni-muenster.de>>
Sendt: onsdag, mai 8, 2024 9:28:54 a.m.
Til: r-sig-geo@r-project.org <mailto:r-sig-geo@r-project.org>
<r-sig-geo@r-project.org <mailto:r-sig-geo@r-project.org>>
Emne: Re: [R-sig-Geo] as.im <http://as.im> in spatstat::ppm not
working as before
r.grid.world.SGDF.F[[1]] is a numerical vector, not even a matrix, so
clearly as.im.default doesn't know what it should do with it.
Maybe there was once a method as.im <http://as.im> for
r.grid.world.SGDF.F, which is of
class SpatialGridDataFrame, but no longer - software evolves.
A way you could approach this is converting that object to a stars
object:
> library(stars)
Loading required package: abind
Loading required package: sf
Linking to GEOS 3.12.1, GDAL 3.8.4, PROJ 9.3.1; sf_use_s2() is TRUE
> as.im <http://as.im>(st_as_stars(r.grid.world.SGDF.F))
Error: Only projected coordinates may be converted to spatstat class
objects
and that points you to another issue you have: spatstat works with data
in Cartesian coordiantes (R2), not with geodetic coordinates (S2). So
that's a helpful error message.
On 08/05/2024 01:49, Alexandre Santos via R-sig-Geo wrote:
> Dear Members,
>
> I'll calculate some old codes for a paper review, and I'm
astonished that as.im <http://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://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fraw.githubusercontent.com%2FLeprechault%2Ftrash%2Fmain%2Fwc2.1_10m_elev.tif&data=05%7C02%7CRoger.Bivand%40nhh.no%7Cd2a2b64634a7462f860708dc6f3082d5%7C33a15b2f849941998d56f20b5aa91af2%7C0%7C0%7C638507501339842669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=cyducyKF16yIdtfuykXUSifCR8clFtxDhiG1eY4waFU%3D&reserved=0
<https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fraw.githubusercontent.com%2FLeprechault%2Ftrash%2Fmain%2Fwc2.1_10m_elev.tif&data=05%7C02%7CRoger.Bivand%40nhh.no%7Cd2a2b64634a7462f860708dc6f3082d5%7C33a15b2f849941998d56f20b5aa91af2%7C0%7C0%7C638507501339842669%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=cyducyKF16yIdtfuykXUSifCR8clFtxDhiG1eY4waFU%3D&reserved=0><https://raw.githubusercontent.com/Leprechault/trash/main/wc2.1_10m_elev.tif
<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 <http://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
>
> _______________________________________________
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--
Edzer Pebesma (he/him)
Universität Münster, Institute for Geoinforma
<https://www.google.com/maps/search/versit%C3%A4t+M%C3%BCnster,+Institute+for+Geoinforma?entry=gmail&source=g>tics
Heisenbergstrasse 2, 48149 Münster, Germany
Phone: +49 251 8333081
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--
Edzer Pebesma (he/him)
Universität Münster, Institute for Geoinformatics
Heisenbergstrasse 2, 48149 Münster, Germany
Phone: +49 251 8333081
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