[R] Spatstat: xy binary data into mask type to use in owin(mask=)

[Javier PB]

Dear users,

I am trying to export polygons from Arcmap into Spatstat to run some
simulations using functions available in Spatstat package.

One particular area to be exported is formed by a number of polygons
defining the external boundaries of the area (as a groups of islands) and a
number of polygons inside the previous ones,  as “holes” not to be
considered as part of the area.

I have managed to export one of these areas using owin(poly=list()),
including in the list the number of external boundaries and holes, but the
number of polygons that constitute each area is large and I was wondering if
this could be easily done using owin(mask=my_area), using only one single
matrix file "my_area" with TRUE, FALSE values defining the whole area. 

Here is where I got stuck. The file I have created in ArcMap contains three
columns: x and y coordinates, and the values at points x[i], y[j] (1 if the
area is TRUE and 0 is the area is FALSE).

How can I covert this xy file into a mask type "my_area" that I can read
using owin(mask=my_area)?

Many thanks in advance

Javier     

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