Julia,

To save an object of class "im" (image object from spatstat) to a
shapefile, you could do the following:

# create example data
library(spatstat)
image <- im( matrix(1:100, nrow=10, ncol=10) )

library(raster)
# transform to RasterLayer
r <- as(image, 'RasterLayer')
# to polygons
p <- rasterToPolygons(r)
# save (using rgdal)
shapefile("shapefile.shp", p)


Whether it makes sense to save raster data to a shapefile rather than to a
raster format file is another matter.

Robert

On Fri, Oct 12, 2012 at 7:10 AM, Julian Burgos <julian@hafro.is> wrote:

> Julia, what do you mean with "shapefile"?  Shapefiles are for vectorial
> data (points, lines, polygons).  Your data appears to be a raster.  What
> exactly do you want to do?
>
>
> On 10/12/2012 11:01 AM, Julia Chacon Labella wrote:
>
>> Hello to everybody,
>>
>> I have an image with the structure that is showed below, and I need to
>> convert it to a shapefile, any idea?
>>
>> str(image)
>>
>> List of 10
>>   $ v     : num [1:201, 1:240] NA NA NA NA NA NA NA NA NA NA ...
>>   $ dim   : int [1:2] 201 240
>>   $ xrange: num [1:2] -0.0114 11.8824
>>   $ yrange: num [1:2] -0.0094 9.9346
>>   $ xstep : num 0.0496
>>   $ ystep : num 0.0495
>>   $ xcol  : num [1:240] 0.0134 0.0629 0.1125 0.1621 0.2116 ...
>>   $ yrow  : num [1:201] 0.0153 0.0648 0.1143 0.1637 0.2132 ...
>>   $ type  : chr "real"
>>   $ units :List of 3
>>    ..$ singular  : chr "unit"
>>    ..$ plural    : chr "units"
>>    ..$ multiplier: num 1
>>    ..- attr(*, "class")= chr "units"
>>   - attr(*, "class")= chr "im"
>>
>> Thank you very much for your attention!!
>>
>> Julia
>>
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>>
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>>
>
> --
> Julian Mariano Burgos, PhD
> Hafrannsóknastofnunin/Marine Research Institute
> Skúlagata 4, 121 Reykjavík, Iceland
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