[R-sig-Geo] unionSpatialPolygons from the command-line

[Edzer Pebesma]

For package sp, I moved "methods" from Imports: to Depends: in order to
avoid this problem with future sp versions or packages with sp in Depends:

On 08/04/16 13:15, Roger Bivand wrote:
> On Thu, 7 Apr 2016, Stachelek, Joseph wrote:
> 
>> Hello,
>>
>> I am trying to call "maptools::unionSpatialPolygons()" from the
>> command-line. To illustrate the problem, I can call
>> example(unionSpatialPolygons) from an interactive session but running
>> an R script (testmaptools.R) containing:
>>
>> `library(maptools)`
>> `example(unionSpatialPolygons)`
>>
> 
> With R --vanilla < testmaptools.R
> 
> and adding print(sessionInfo()) to the script, we see:
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
> 
> and it runs correctly. With
> 
> Rscript testmaptools.R
> 
> we see:
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  base
> 
> The script runs using Rscript if library(methods) is added as the first
> line. This issue has been seen elsewhere recently in another context, we
> don't know why.
> 
> Hope this clarifies,
> 
> Roger
> 
>> yields:
>>
>> `$ Rscript testmaptools.R`
>>> WARNING: ignoring environment value of R_HOME
>>> Loading required package: sp
>>> Checking rgeos availability: TRUE
>>
>>> unnSpP> if (rgeosStatus()) {
>>> unnSpP+ nc1 <- readShapePoly(system.file("shapes/sids.shp",
>>> package="maptools")[1],
>>> unnSpP+  proj4string=CRS("+proj=longlat +datum=NAD27"))
>>> unnSpP+ lps <- coordinates(nc1)
>>> unnSpP+ ID <- cut(lps[,1], quantile(lps[,1]), include.lowest=TRUE)
>>> unnSpP+ reg4 <- unionSpatialPolygons(nc1, ID)
>>> unnSpP+ row.names(reg4)
>>> unnSpP+ }
>>> Error in rgeos::gUnaryUnion(spgeom = SpP, id = IDs) :
>>>   Invalid geometry, may only be applied to polygons
>>> Calls: example ... eval -> eval -> unionSpatialPolygons -> <Anonymous>
>>> Execution halted
>>
>> Is this not possible?
>>
>> Thank you,
>>
>> Joseph Stachelek
>>
>>
>> We value your opinion. Please take a few minutes to shar...{{dropped:8}}
>>
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>>
> 

-- 
Edzer Pebesma
Institute for Geoinformatics  (ifgi),  University of Münster
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/
Spatial Statistics Society http://www.spatialstatistics.info

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