[R-sig-Geo] problem with merge grids in R+SAGA

[Alexander Brenning]

Tomislav Hengl wrote:
> Alessandro,
> 
> You need to separate the put the list of input grids as a character vector e.g.:
> 
> GRIDS=c("DSM1.sgrd,DSM2.sgrd,DSM3.sgrd")

...not when calling the rsaga.geoprocessor, if I recall correctly. The 
high-level wrapper functions would accept a vector, but the 
rsaga.geoprocessor would expect this:

GRIDS = "DSM1.sgrd;DSM2.sgrd;DSM3.sgrd"

Cheers
  Alex


> 
> 
> See also:
> http://spatial-analyst.net/wiki/index.php?title=Software#SAGA_GIS
> 
> Maybe you should also study this posting guide:
> http://spatial-analyst.net/wiki/index.php?title=Scripting_in_R 
> 
> 
> 
> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of
> alessandro.montaghi at unifi.it
> Sent: Thursday, November 13, 2008 9:20 AM
> To: r-sig-geo at stat.math.ethz.ch
> Subject: [R-sig-Geo] problem with merge grids in R+SAGA
> Importance: High
> 
> Hi All
> 
> when I use this function with R and SAGA:
> 
> rsaga.get.usage("grid_tools", 3)
> rsaga.geoprocessor(lib="grid_tools", module=3,  
> param=list(GRIDS="DSM1.sgrd,DSM2.sgrd,DSM3.sgrd",GRID_TARGET="DSM.sgrd",TYPE=7, INTERPOL=2,  
> OVERLAP=0))
> 
> I have this problem
> 
> SAGA CMD 2.0.3
> library path:   C:\Windows/modules
> library name:   grid_tools
> module name :   Merging
> author      :   (c) 2003 by O.Conrad
> 
> Load grid: DSM1.sgrd,DSM2.sgrd,DSM3.sgrd...
> 
> failed
> 
> error: Grid file could not be opened.
> 
> error: input file [DSM1.sgrd,DSM2.sgrd,DSM3.sgrd]
> 
> error: empty input list [GRIDS]
> 
> error: executing module [Merging]
> 
> 
> I don't understand very well where is the problem of the code.
> 
> thanks for help
> 
> Ale
> 
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-- 
Alexander Brenning
brenning at uwaterloo.ca - T +1-519-888-4567 ext 35783
Department of Geography and Environmental Management
University of Waterloo
200 University Ave. W - Waterloo, ON - Canada N2L 3G1
http://www.fes.uwaterloo.ca/geography/faculty/brenning/