Thank you Ben, setting na.rm = T did the job.

Best wishes
Joao

On 16 May 2018 at 19:36, Ben Tupper <btup...@bigelow.org> wrote:
> Hi,
>
> It's hard to know without any reproducible code, but you will want to pay
> close attention to the value of the na.rm argument to
> raster::extract(Raster,SpatialPolygons)
>
> See ?extract for all the details.
>
> Cheers,
> Ben
>
> On May 16, 2018, at 2:27 PM, João Carreiras <jmbcarrei...@gmail.com> wrote:
>
> Greetings!
>
> I'm using the extract command (raster package) with a raster layer (x)
> and a spatial polygons dataframe (y). I'm using it to extract the sum
> of raster values by each spatial polygon. However, I'm getting NAs as
> a result for some polygon IDs, which I know isn't true because that
> doesn't happen in ArcGIS.
>
> Does anyone experienced the same issue?
>
> Thanks!
> Joao
>
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>
> Ben Tupper
> Bigelow Laboratory for Ocean Sciences
> 60 Bigelow Drive, P.O. Box 380
> East Boothbay, Maine 04544
> http://www.bigelow.org
>
> Tick Forecasting: https://eco.bigelow.org/
>
>
>
>

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