Get EPSG codes or PROJ.4 codes for projections from the State Plane Coordinate System.
state_plane(state, plane_id = NULL, type = c("epsg", "proj4"))
The postal code for the state.
The state plane geographic zone identifier. A NULL
value will return a projection for the entire state.
The type of output to return: either an EPSG code or PROJ4 string.
Either a PROJ4 string as a character vector or an EPSG code as an integer.
For documentation of the underlying State Plane Coordinate System
projection data frame, see state_proj
.
# NOT RUN { if (require(USAboundariesData)) { state_plane(state = "MA", type = "epsg") state_plane(state = "MA", type = "proj4") state_plane(state = "MA", plane_id = "island", type = "epsg") state_plane(state = "MA", plane_id = "island", type = "proj4") # Show the difference made by a state plane projection if (require(sf)) { va <- us_states(states = "VA", resolution = "high") plot(st_geometry(va), graticule = TRUE) va <- st_transform(va, state_plane("VA")) plot(st_geometry(va), graticule = TRUE) } } # }