[R-sig-Geo] RPyGeo: merge geoprocessing problems with "field_mappings" option

[Alexander Brenning]

Dear Gianni,

I haven't used the Merge_management tool in ArcGIS, but after having a 
look at ESRI's documentation...

http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Merge_(Data_Management)

...it seems to me that field_mappings is not just a character string but 
an object of the class "FieldMappings":

http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?id=812&pid=785&topicname=FieldMappings_properties

This is not something that would be easily addressed from within R, 
you'd better just use Python directly if you want to automate this with 
ArcGIS Geoprocessing tools.

Cheers
  Alex



gianni lavaredo wrote:
> Hi All
> 
> I am testing RPyGeo (old version) developed to Prof. Alexander Brenning.  I
> wish to merge three points shapefile each with this database: ID, X, Y, V.
> The Scripting syntax in Python is "Merge_management (inputs, output,
> field_mappings)", where  with "field_mappings" (Optional) I can chose the
> output shapefile fields. I am trying in R+ RPyGeo with different code but
> always I have the right result but with all 4 fields.
> 
> 
> 
> rpygeo.geoprocessor("Merge_management",
> c("C:\\work\\point1.shp;C:\\work\\point2.shp;C:\\work\\point3.shp","C:\\work\\point_merge.shp"),
> "field_mappings:ID;V")
> 
> 
> 
> thanks in advance
> 
> Gianni
> 
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> 
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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/