[R-sig-Geo] flipVertical [SEC=UNCLASSIFIED]

[Roger Bivand]

On Fri, 5 Oct 2012, Hafi, Ahmed wrote:

> Hi ,
>
>
>
> I am trying to flip a SpatialPointDataFrame vertically. The SP help on
> flipVertical says that you can flip a SpatialPointDataFrame or
> SpatialGridDataFrame. But when I tried using a SpatialPointDataFrame as
> the argument, R comes up with an error message saying that it has to be
> a SpatialGridDataFrame. I am trying to overlay a SpatialPolygonDataFrame
> on SpatialPointDataFrame and counts the number of points falling into
> each polygon. Before I do that I need to flip the points data frame
> vertically. I would appreciate very much if you could help me out by
> telling me what I am doing wrong or is there a better a way of getting
> the overlay job done, given that I need to flip the points data frame.
>

?elide in maptools, possibly passing through the bounding box of the grid. 
To follow up, include a self-contained example (say using meuse and 
meuse.grid).

Roger

>
>
> Thanks
>
>
>
> Ahmed Hafi
>
> Australian Bureau of Agricultural and Resource Economics and Sciences
> (ABARES)
>
>
>
>
>
>
>
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-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no