[R-sig-Geo] Merging SpatialPolygonsDataFrame and SpatialLinesDataFrame

[Paul Hiemstra]

Hi,

You might also want to look into the links between Grass and R and SAGA 
and R. This link enables you to use the GIS functionality of these 
programs from R, I'm fairly certain that this includes the functionality 
your requested.

cheers,
Paul

Jim Burke wrote:
> Hi everyone,
>
> Been scratching my head on this. A common
> operation. Google seems to be mute on this,
> so I turn to you.
>
> I have a nice SpatialPolygonsDataFrame that I
> can plot with wonderful colors using spplot.
>
> I would like to
>
> 1. MERGE SpatialLinesDataFrame (PolyLine) over
> the SpatialPolygonsDataFrame (Polygons). And
> plot with spplot().
>
> 2. CLIP the PolyLine to the area of the Polygons.
> The polygons are within the larger main_main roads
> Polyline
>
> 3. COLOR PolyLine main_roads different than
> black for example; white or gray.
>
>
> NOTES. FILE READS ARE BELOW
>
> >tx3_sp <- readShapePoly("tx3_sp.shp", IDvar="PCT",
> proj4string=CRS("+proj=aea +ellps=GRS80 +datum=WGS84"),
> verbose=TRUE, repair=FALSE)
> Shapefile type: Polygon, (5), # of Shapes: 39
>
> >main_roads <-readShapeLines("main roads.shp",
> proj4string=CRS("+proj=aea +ellps=GRS80 +datum=WGS84"),
> verbose=TRUE,repair=FALSE)
> Shapefile type: PolyLine, (3), # of Shapes: 29161
>
> > class(tx3_sp)
> [1] "SpatialPolygonsDataFrame"
> attr(,"package")
> [1] "sp"
>
> > class(main_roads)
> [1] "SpatialLinesDataFrame"
> attr(,"package")
> [1] "sp"
>
> Thanks and I am grateful for all thoughts and assistance,
> Jim Burke
>
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul