Convert to spatial format

Source: R/Spatial.R

Take the output of bgmfile and return a Spatial object or a sf object.

boxSpatial(bgm)

box_sp(bgm)

box_sf(bgm)

boundarySpatial(bgm)

boundary_sp(bgm)

boundary_sf(bgm)

node_sp(bgm)

point_sp(bgm)

faceSpatial(bgm)

face_sp(bgm)

face_sf(bgm)

Arguments

bgm

output of a BGM file, as returned by bgmfile

Value

Spatial* object or sf object

  • box_sf sf with sfc_POLYGON column

  • face_sf sf with sfc_LINESTRING column

  • boundary_sf sf with sfc_POLYGON column

  • node_sf sf with sfc_POINT column

  • point_sf sf with sfc_POINT column

Details

Note that the `_sp` forms are aliased to original functions called `*Spatial`, and now have `_sf` counterparts to return that format.

Warning

The sf objects created by `box_sf()`, `node_sf()`, `face_sf()`, `boundary_sf()` and `point_sf()` were not created by the sf package. They were created with reference to the sf format prior to November 2019. If you have problems it may be necessary to recreate the 'crs' part of the of the object with code like `x <- box_sf(bgm); library(sf); st_crs(x) <- st_crs(attr(x$geometry, "crs")$proj)`.

Get in touch ([create an issue](https://github.com/AustralianAntarcticDivision/rbgm/issues)) if you have any troubles.

Examples

fname <- bgmfiles::bgmfiles(pattern = "antarctica_28")
bgm <- bgmfile(fname)
spdf <- box_sp(bgm)
sfdf <- box_sf(bgm)
sldf <- face_sp(bgm)

plot(spdf, col = grey(seq(0, 1, length = nrow(bgm$boxes))))
plot(sldf, col = rainbow(nrow(bgm$faces)), lwd = 2,  add = TRUE)