I am producing Kernel density estimates for animals from tracking data.

Location is input at x y data, I produce a spatial polygons dataframe from these coordinates.

xy<-id[c("X", "Y")]
idsp <- data.frame(id)
coordinates(idsp) <- xy

I set the CRS

proj4string(idsp) <- CRS("+proj=utm +datum=WGS84 +units=m +no_defs")

I then use adehabitatHR to produce KDE95s for my individual animals using the kernelUD and getverticeshr.

cromKDE<- kernelUD(idsp, h = "href")
CromKDE95 <- getverticeshr(cromKDE, percent = 95)

I convert these outputs into the appropriate CRS for the package leaflet using

CromKDE95<- spTransform(CromKDE95, CRS('+init=epsg:4326'))

I then try to use the package leaflet to visualise the KDE95 polygons on a basemap

leaflet(CromKDE95) %>% addTiles() %>%

But the polygons are plotting in the Ocean south of San-Pedro rather than in Ireland as they should be.

I realise this is likely a simple fix adjusting the CRS but I have tried all the different formats I can think of.

  • 3
    Where are you getting CRS("+proj=utm +datum=WGS84 +units=m +no_defs") - that's an uncommon reference system and I'm wondering if someone has said "this is UTM" when in fact its in a UTM zone - which means you need the zone number...
    – Spacedman
    May 13, 2020 at 19:24

1 Answer 1

CromKDE95 <-sp::CRS("+init=epsg:29902")

Try this using the EPSG format for ireland (29902)

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