[R-sig-Geo] convert spatstat owin-object to splancs

[Marco Helbich]

Dear list,

I have the following problem: my dataset contains some events (points) and a 
studyarea, I used some spatstat functions and now I want to use the 
bandwidth estimation mse2d() in the splancs package. My problem is to 
convert the spatstat owin-object (studyarea) to use it in the splancs 
package. This is the structure of my studyarea:

str(studyarea)
Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots
  ..@ data       :'data.frame': 1 obs. of  4 variables:
  .. ..$ Id       : int 0
  .. ..$ Area_sqmi: num 513
  .. ..$ Areasqmi : num 513
  .. ..$ Areakm2  : num 1329
  ..@ polygons   :List of 1
  .. ..$ :Formal class 'Polygons' [package "sp"] with 5 slots
  .. .. .. ..@ Polygons :List of 1
  .. .. .. .. ..$ :Formal class 'Polygon' [package "sp"] with 5 slots
  .. .. .. .. .. .. ..@ labpt  : num [1:2] 1446129 850484
  .. .. .. .. .. .. ..@ area   : num 1.33e+09
  .. .. .. .. .. .. ..@ hole   : logi FALSE
  .. .. .. .. .. .. ..@ ringDir: int 1
  .. .. .. .. .. .. ..@ coords : num [1:3530, 1:2] 1458298 1458329 1458357 
1458411 1458494 ...
  .. .. .. ..@ plotOrder: int 1
  .. .. .. ..@ labpt    : num [1:2] 1446129 850484
  .. .. .. ..@ ID       : chr "0"
  .. .. .. ..@ area     : num 1.33e+09
  ..@ plotOrder  : int 1
  ..@ bbox       : num [1:2, 1:2] 1420242 828662 1476943 872228
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : chr [1:2] "r1" "r2"
  .. .. ..$ : chr [1:2] "min" "max"
  ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots
  .. .. ..@ projargs: chr " +proj=lcc +lat_1=34.91666666666666 
+lat_2=27.41666666666667 +lat_0=31.16666666666667 +lon_0=-100 +x_0=1000000 
+y_0=1000000 +el"| __truncated__
>

Thank you for your help!
Marco