Description Usage Arguments Details Value Author(s) See Also Examples
This function will generate a presence/absence matrix based on a grid (if type="grid") or on countries (if type="countries").
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data |
data.frame |
type |
"grid", "countries" or "user" |
resolution |
numeric (degrees) |
pres.abs |
logical |
write.output |
logical |
layer |
Spatial DataFrame object, see |
It requires a data.frame with three columns, ordered as: species, longitude and latitude. The resolution of the grid can be changed by the argument "resolution" (in degrees). If type = "user", a layer to intersect the points and create the matrix should be supplied (a Spatial DataFrame object). It uses functions of the package raster and maptools. If pres.abs = F the returned matrix will have "x" instead of 0 and 1.
list, with a matrix and grid (if type="grid), or a matrix (if type="countries").
Marcelo Reginato
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | ## loading the example data
data(monographaR_examples)
monographaR_examples$map_data -> data
head(data)
## running the function with grid
map.table <- mapTable(data, type="grid", resolution=3,
write.output=FALSE)
map.table$table
t(map.table$table)
map.table$grid -> grid
data(wrld_simpl)
plot(grid, border="white")
plot(wrld_simpl, add=TRUE)
plot(grid, add=TRUE)
raster::text(grid, grid@data$layer, cex=1)
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