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I got a raster image with 2m pixel size, there are some areas with value 1 (black) and roads with value NA (white):

enter image description here

It is made from a rasterized shape:

enter image description here

Now I resample my raster to 5 m pixels, the roads are now sometimes gone. How can I preserve these structures? Eg cut out the streets in this resolution.

enter image description here

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    And for clarity, you don't have the original vector data at this point? You have a raster you need to resample?
    – Spacedman
    Commented Nov 23, 2021 at 18:08
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    I would go for an aggregation with a function like if (anyNA(x)) return NA else return x[1]).
    – JRR
    Commented Nov 23, 2021 at 18:51
  • Right now I use aggregate in R, na.rm should do the same as your suggested if statement. aggregate(layer,fact=5, fun = modal, na.rm = TRUE)
    – sfetan
    Commented Nov 24, 2021 at 8:19

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