[R-sig-Geo] change projection?

[Ingo Holz]

Hi,

 I imported a ESRIAsciiGrid with readGDAL(). The result is a SpatialGridDataFrame (SGDF).

The projection of the grid (only the xllcorner, yllcorner ?) is:
Projection		LAMBERT
Units			METERS
Spheroid		BESSEL
(more details at the end of this email)

How can I change this to gauss-krueger projection zone 3 (gk3)?

I did not specify the projection in the SGDF, how is this done?

summary(SGDF):

Closing GDAL dataset handle (nil)... done.
Object of class SpatialGridDataFrame
Coordinates:
      min     max
x -250000  500000
y   20000 1020000
Is projected: NA 
proj4string : [NA]
Number of points: 2
Grid attributes:
  cellcentre.offset cellsize cells.dim
x           -249500     1000       750
y             20500     1000      1000
Data attributes:
     band1       
 Min.   :   812  
 ....

There should be a simple way to use library(proj4) to make this transformation?

Are I am right that actually only the "xllcorner, yllcorner"-values are transformed?

Where can I find an easy (and maybe short) introduction to this topic?

Thank you,
Ingo 


######
Description of Grid ...*

Cell Size (meters)	=	1000.000		Data Type:			
Integer
Number of Rows	 =	1000		 	Number of Values =		....*
Number of Columns =		750		 	Attribute Data (bytes) =	...*

BOUNDARY:					STATISTICS:
Xmin =			 -250000.000		Minimum Value =		...*
Xmax =		  500000.000		Maximum Value =		...*
Ymin =			    20000.000		Mean		 =		...*
Ymax =		1020000.000		Standard Deviation =		...*


COORDINATE SYSTEM DESCRIPTION

Projection		LAMBERT
Units			METERS
Spheroid		BESSEL
Parameters:
1st standard parallel				50 0 0.000
2nd standard parallel				51 0 0.000
central meridian				9 0 0.000
latitude of projection's origin			47 0 0.000
false easting (meters)				0.00000
false northing (meters)				0.00000