/
find_neighbor_mesh.R
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find_neighbor_mesh.R
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#' Find out neighborhood meshes collection
#' @inheritParams mesh_to_coords
#' @param contains logical. contains input meshcode (default `TRUE`)
#' @description input should use meshcode under the 1km mesh size.
#' @return [meshcode][meshcode]
#' @examples
#' neighbor_mesh(53394501)
#' neighbor_mesh(533945011)
#' neighbor_mesh(533945011, contains = FALSE)
#' @rdname neighbor_mesh
#' @export
neighbor_mesh <- function(meshcode, contains = TRUE) {
if (is_meshcode(meshcode) == FALSE) {
meshcode <-
meshcode(meshcode)
}
size <-
mesh_size(meshcode)
if (size < mesh_units[5]) {
rlang::inform("Too small meshsize. Enable 80km to 500m size.")
} else if (size >= mesh_units[4]) {
find_neighbor_mesh(meshcode, contains = contains) # nolint
} else if (size == mesh_units[5]) {
find_neighbor_finemesh(meshcode, contains = contains) # nolint
} else {
NULL
}
}
#' @rdname neighbor_mesh
#' @export
find_neighbor_mesh <- function(meshcode = NULL, contains = TRUE) { # nolint
if (is_meshcode(meshcode) == FALSE) {
meshcode <-
meshcode(meshcode)
}
size <-
mesh_size(meshcode)
mesh_code <-
as.numeric(vctrs::field(meshcode, "mesh_code"))
# nolint start
if (size == mesh_units[1]) {
res <-
mesh_code - c(1, -1, 101, 100, 0, 99, -99, -100, -101)
} else if (size == mesh_units[2]) {
if (is_corner(meshcode)) {
if (grepl("(00|70|07|77|0[1-6]|[1-6]7|[1-6]0|7[1-6])$", mesh_code)) {
res <- mesh_code +
if (grepl("00$", mesh_code))
c(0, 1, -83, 10, 11, -93, -10023, -9930, -9929)
else if (grepl("07$", mesh_code))
c(-1, 0, 93, 9, 10, 103, -9931, -9930, -9837)
else if (grepl("70$", mesh_code))
c(0, 1, 9930, 9931, -9, -10, -93, -83, -103)
else if (grepl("77$", mesh_code))
c(9929, 9930, 10023, -1, 0, 93, -11, -10, 83)
else if (grepl("0[1-6]$", mesh_code))
c(-1, 0, 1, 9, 10, 11, -9931, -9930, -9929)
else if (grepl("[1-6]7$", mesh_code))
c(-1, 0, 93, 9, 10, 103, -11, -10, 83)
else if (grepl("[1-6]0$", mesh_code))
c(0, 1, -9, -10, 11, 10, -83, -93, -103)
else if (grepl("7[1-6]$", mesh_code))
c(-1, 0, 1, 9929, 9930, 9931, -11, -10, -9)
}} else
res <- mesh_code + c(9, 10, 11, -1, 0, 1, -9, -10, -11)
# Must be ends 1-7
res <- unique(res[grepl("[8-9]$", res) == FALSE])
} else if (size == mesh_units[4]) {
if (is_corner(mesh_code)) {
if (grepl("(00|09|90|99|010[1-8]|[1-8]9|[1-8]0|9[1-8]|0[1-8])$", mesh_code)) {
res <-
mesh_code -
if (grepl("0000$", mesh_code)) {
c(9281, -10, -11, 9291, 0, -1, 1002201, 992910, 992909)
} else if (grepl("0[1-9]00$", mesh_code)) {
c(81, -10, -11, 91, 0, -1, 993001, 992910, 992909)
} else if (grepl("[1-9]000$", mesh_code)) {
c(9281, -10, -11, 9291, 0, -1, 10201, 910, 909)
} else if (grepl("[0-9][1-9]00$", mesh_code)) {
c(81, -10, -11, 91, 0, -1, 1001, 910, 909)
} else if (grepl("[1-9][0-9]09$", mesh_code)) {
c(-9, -10, -101, 1, 0, -91, 911, 910, 819) # 51331109
} else if (grepl("0[0-9]09$", mesh_code)) {
c(-9, -10, -101, 1, 0, -91, 992911, 992910, 992819)
} else if (grepl("0009$", mesh_code)) {
c(-9, -10, -101, 1, 0, -91, 992911, 992910, 992819)
} else if (grepl("[0-9][1-9]90$", mesh_code)) {
c(-819, -910, -911, 91, 0, -1, 101, 10, 9)
} else if (grepl("[0-9]090$", mesh_code)) {
c(8381, -910, -911, 9291, 0, -1, 9301, 10, 9)
} else if (grepl("99$", mesh_code)) {
c(-909, -910, -1001, 1, 0, -91, 11, 10, -81)
} else if (grepl("(0[1-9]0[1-8])$", mesh_code)) {
c(-9, -10, -11, 1, 0, -1, 992911, 992910, 992909)
} else if (grepl("([1-8]9)$", mesh_code)) {
c(-9, -10, -101, 1, 0, -91, 11, 10, -81)
} else if (grepl("[0-9][1-9][1-8]0$", mesh_code)) {
c(81, -10, -11, 91, 0, -1, 101, 10, 9)
} else if (grepl("[0-9]0[1-8]0$", mesh_code)) {
c(9281, -10, -11, 9291, 0, -1, 9301, 10, 9)
} else if (grepl("[0-6][0-9]9[1-8]$", mesh_code)) {
c(-909, -910, -911, 1, 0, -1, 11, 10, 9) # 53394592
} else if (grepl("7[0-9]9[1-8]$", mesh_code)) {
c(-992909, -992910, -992911, 1, 0, -1, 11, 10, 9) # 65417592
} else if (grepl("[1-9][0-9]0[1-8]$", mesh_code)) {
c(-9, -10, -11, 1, 0, -1, 911, 910, 909)
} else if (grepl("0[0-9]0[1-8]$", mesh_code)) {
c(-9, -10, -11, 1, 0, -1, 992911, 992910, 992909)
}
}} else {
res <-
mesh_code + c(9, 10, 11, -1, 0, 1, -9, -10, -11)
}}
# nolint end
if (rlang::is_false(contains)) {
res <-
res[res != mesh_code]
}
meshcode(unique(cut_off(res))) # nolint
}
find_neighbor_finemesh <- function(meshcode, contains = TRUE) {
relate <- NULL
if (is_meshcode(meshcode) == FALSE) {
meshcode <-
meshcode(meshcode)
}
df_poly <-
coarse_gather(meshcode) %>%
find_neighbor_mesh() %>% # nolint
bind_meshpolys()
df_poly$n <-
seq_len(nrow(df_poly))
# nolint start
df_poly$relate <-
suppressWarnings(
suppressMessages(
sapply(df_poly$geometry,
sf::st_relate,
y = sf::st_buffer(
df_poly$geometry[which(
vctrs::field(df_poly$meshcode, "mesh_code") == vctrs::field(meshcode, "mesh_code"))],
dist = 0.00005),
sparse = FALSE)))
if (length(df_poly$meshcode[df_poly$relate %in% c("212101212", "2FF1FF212")]) != 9) { # nolint
df_poly$relate <-
suppressWarnings(
suppressMessages(
sapply(df_poly$geometry,
sf::st_relate,
y = sf::st_buffer(
df_poly$geometry[which(df_poly$meshcode == meshcode)],
dist = 0.0002),
sparse = FALSE)))
}
# nolint end
neighbor <-
subset(df_poly, relate %in% c("212101212", "2FF1FF212"))$meshcode # nolint
if (rlang::is_false(contains))
neighbor <-
neighbor[!vctrs::field(neighbor, "mesh_code") %in% vctrs::field(meshcode, "mesh_code")]
return(neighbor)
}