Re: [R-sig-Geo] Raster extract by polygon generating NAs

[João Carreiras]

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

Best wishes
Joao

On 16 May 2018 at 19:36, Ben Tupper  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  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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Re: [R-sig-Geo] Raster extract by polygon generating NAs

[Ben Tupper]

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  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
> 
> ___
> R-sig-Geo mailing list
> R-sig-Geo@r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> 

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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[R-sig-Geo] Raster extract by polygon generating NAs

[João Carreiras]

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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