#' Function to read tab delimited text files generated by
#' \code{http://www.gpsvisualizer.com/draw} as spatial polygons.
#'
#' @param file File name.
#'
#' @param type Type of spatial object to generate.
#'
#' @author Stuart K. Grange
#'
#' @return Spatial polygons.
#'
#' @export
read_gps_visualizer <- function(file, type = "polygon") {
stopifnot(type == "polygon")
# Load
suppressWarnings(
df <- readr::read_delim(
file, delim = "\t", show_col_types = FALSE, progress = FALSE
)
)
# When there are multiple units in the file
if (class(df$latitude[1]) == "character") {
df <- df %>%
filter(type != "type") %>%
mutate(latitude = as.numeric(latitude),
longitude = as.numeric(longitude)) %>%
tidyr::fill(desc)
id <- "desc"
} else {
id <- NA
}
# Promote to spatial object
sp <- gissr::sp_from_data_frame(df, type = type, id = id)
return(sp)
}
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