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

[Roger Bivand]

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/.

For non-archival work, update the workflow. See also 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-bounces using r-project.org> p� vegne av Edzer Pebesma <edzer.pebesma using uni-muenster.de>
Sendt: onsdag, mai 8, 2024 9:28:54 a.m.
Til: r-sig-geo using r-project.org <r-sig-geo using r-project.org>
Emne: Re: [R-sig-Geo] 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 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(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() 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://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
>
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--
Edzer Pebesma (he/him)
Universit�t M�nster, Institute for Geoinformatics
Heisenbergstrasse 2, 48149 M�nster, Germany
Phone: +49 251 8333081

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