Dear friends,
  I had a point pattern dataset, whose locations was defined by  lat./long..
In the past, I used ARCGIS to specify its coordinate system and the
projection method, now i want to do it in R. I don't know how to do it,
because it needs me to specify the *Geographic Coordinate System and the
Projected Coordinate System.* Maybe i mistake the information in ARCGIS and
only the projection method need to be specified because of my poor knwledge
on coordiante systems.

---------------------------------------------------The information in ARCGIS
after projecting the dataset-------
Geometry Type: Point

*Geographic Coordinate System:* #specify the coordinate system
GCS_Xian_1980
Datum: D_Xian_1980
Prime Meridian: 0

*Projected Coordinate System:* Xian_1980_3_Degree_GK_CM_117E   #specify the
projection method
Projection: Gauss_Kruger
False_Easting: 500000.00000000
False_Northing: 0.00000000
Central_Meridian: 117.00000000
Scale_Factor: 1.00000000
Latitude_Of_Origin: 0.00000000
Linear Unit: Meter (1.000000)
----------------------------------------------------------------------------------------------------------------------------
mapproject(x, y, projection="", parameters=NULL, orientation=NULL)  *#only
allows us to define the projected coordinate system
Anybody knows how to finish it in R? Maybe rgdal() can it, but it's a liitle
difficult for me*.

*Example of my dataset:*

ID  CLASS SOILTEM AIRTEM GHEIGHT H      *LAT     LONG*
1   1      19       20      50        30.61688 117.4140
2   1      19       21      65        30.61686 117.4140
3   2      20       22      55        30.61680 117.4139
4   3      20       26      10        30.61675 117.4139
5   4      20       23      75        30.61679 117.4140
6   1      21       21      55        30.61685 117.4141

BTW, when i load the package rgdal, the following errors appear,*where is
the wrong*? Does it mean i need to use the R2.4.0 version?
error in load(dataFile, ns) : ReadItem uncorrect$B!'(Bno class 25
Warning message:
package'rgdal'is build with R2.4.0
error: package'rgdal' R's input code fail
error: 'rgdal'package/name space load fail$B!$(B
-------------------------------package information
----------------------------
R : Version 2.3.1 (2006-06-01)
rgdal_0.5-1
---------------------------------------------

-- 
With Kind Regards,

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[***********************************************************************]
Zhi Jie,Zhang ,PHD
Tel:86-21-54237149   epistat@gmail.com
Dept. of Epidemiology,school of public health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
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