[Rspatial-devel] sp: SpatialGrid now directly inherits from Spatial (only)

[Roger Bivand]

On Sun, 18 Sep 2011, Edzer Pebesma wrote:

> I committed a largish edit to sp today.
>
> In particular, following my investigations reported here:
> https://stat.ethz.ch/pipermail/r-devel/2011-September/062037.html
> having SpatialGrid directly inheriting from SpatialPixels does not work,
> as it needs an explicit coerce (coordinates are not there!), and setting
> this coerce with setAs() does lead to unexpected results (essentially,
> objects becoming "Spatial").
>
> Now, SpatialGrid inherits from Spatial, and an explicit setIs() makes it
> SpatialPixels too, and sets the right coerce function.
>
> The following methods were moved from functions to S4 generics:
> proj4string, proj4string<-, gridded, gridded<-, is.projected.
>

Edzer,

I see a failure in Ch 3 with the new code:

> ###################################################
> ### chunk number 11:
> ###################################################
> data(meuse.grid .... [TRUNCATED]

> coordinates(meuse.grid) <- c("x", "y")

> meuse.grid <- as(meuse.grid, "SpatialPixels")

> image(meuse.grid, col = "grey")
Error in image.default(meuse.grid, col = "grey") :
   argument must be matrix-like


And one in in Ch 4 that I made myself. Both could be related to rev 1139 
in image.R:

https://r-forge.r-project.org/scm/viewvc.php/pkg/sp/R/image.R?root=rspatial&r1=1026&r2=1139

This was motivated by an off-list request to suppress the warning given 
when image(, breaks= ) is used as breaks is not an argument in 
plot.window, which gets the ... send through.

I'll try to fix this myself, and test again on the book code.

Roger


-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
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