[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 <jmbcarreiras at 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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