[R-sig-Geo] SpatStat: creating window from quadrats

[Kévin Morelle]

Dear Marcelino,

Thanks for your reply...
It works until I have to use 'boardquadrats' as my window. boardquadrats 
is a list including binary image mask, and i have to convert it in a 
window, am I right?
Reading the book from Baddeley, it seems I have to convert it in a 
matrix and then only in a window using 'owin'. But somehow it doesn't 
work...
Sorry with this I'm only discovering R (and Spatial R) very recently.
Thank you for any further help you could provide me,
Regards,

Kevin

Le 03/08/2011 18:34, marcelino.delacruz at upm.es a écrit :
> Hi Kevin,
>
> My answer with an example:
>
>   W<- square(10) # the big window
>   Z<- quadrats(W, 4, 5) # the quadrats
>
>   # point pattern of boarddamage in the big window:
>   boardd<- rpoispp(0.1, win=W)
>
> # A splited point pattern. Each element is a quadrat with at least one
> point
>   boardquadrats<- split(boardd, Z, drop=T)
>
> Cheers, Marcelino
>
>
>
>
>
> Con fecha 3/8/2011, "Kévin Morelle"<Kevin.Morelle at ulg.ac.be>  escribió:
>
>> Dear R-sig-geo list members,
>>
>> I'm using the SpatStat R packages for analysing patterns of wild boar
>> damages, considered as my point pattern dataset.
>> This dataset is quite large, covering almost whole Belgium. I would like
>> to make my analysis by quadrats of 10x10km. I thus created quadrats
>> covering my points dataset using quadrats function.
>> There come my question. I would like to retain as my window, only the
>> quadrats that contain damage points and remove the one that are empty. I
>> have the feeling this question is trivial but I couldn't find any way to
>> do that (apart from creating a grid shape in GIS, but would prefer not...).
>> Thanks for your help,
>> Regards,
>>
>> Kevin
>>
>> -- 
>> Morelle Kevin
>> Université de Liège - Gembloux Agro-Bio Tech
>> Unité de Gestion des Ressources forestières et des Milieux naturels
>> --------
>> University of Liège - Gembloux Agro-Bio Tech
>> Unit of Forest and Nature Management
>> --------
>> 2, Passage des Déportés
>> B-5030  GEMBLOUX
>> BELGIQUE
>>
>> Tél : + 32 (0)81 62.22.14
>> Fax : + 32 (0)81 62.23.01
>> E-mail : kevin.morelle at ulg.ac.be
>> Web : http://www.fsagx.ac.be/gf/
>>
>> _______________________________________________
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-- 
Morelle Kevin
Université de Liège - Gembloux Agro-Bio Tech
Unité de Gestion des Ressources forestières et des Milieux naturels
--------
University of Liège - Gembloux Agro-Bio Tech
Unit of Forest and Nature Management
--------
2, Passage des Déportés
B-5030  GEMBLOUX
BELGIQUE

Tél : + 32 (0)81 62.22.14
Fax : + 32 (0)81 62.23.01
E-mail : kevin.morelle at ulg.ac.be
Web : http://www.fsagx.ac.be/gf/