Nothing
R/segmetric.R
In segmetric: Metrics for Assessing Segmentation Accuracy for Geospatial Data
Defines functions
`[.segmetric`
sm_is_empty
summary.segmetric
.sm_weight
round.segmetric
plot.segmetric
print.segmetric
sm_clear
sm_read
.segmetric_env
.segmetric_check
Documented in
plot.segmetric
.segmetric_check
.segmetric_env
sm_clear
sm_is_empty
sm_read
summary.segmetric
#' @title General functions
#'
#' @name segmetric_functions
#'
#' @description
#' These functions manipulate `segmetric` objects.
#' * `sm_read()`: Load the reference and segmentation polygons into segmetric.
#' * `sm_clear()`: Remove the already calculated metrics from segmetric.
#' * `print()`: Print a segmetric object.
#' * `plot()`: Plot the reference and segmentation polygons.
#' * `summary()`: Compute a measure of central tendency over the values of a metric.
#' * `sm_is_empty()`: Check if a `segmetric` object is empty.
#'
#' @param m A `segmetric` object.
#' @param object A `segmetric` object.
#' @param ref_sf A `sf` object. The reference polygons.
#' @param seg_sf A `sf` object. The segmentation polygons.
#' @param ... Additional parameters (Not implemented).
#' @param weight Weights to summarize metrics. Accepts `character` options
#' `"ref"`, `"seg"`, and `"inter"`, that weights using reference, segment,
#' and intersection areas, respectively. Also accepts a `numeric` vector
#' of weights of the same length as input metrics giving the weights to
#' be used.
#' @param na_rm Should missing values (including `NaN`) be removed?
#'
#' @returns
#' * `sm_read()`, `sm_clear()`: Return a `segmetric` object containing an
#' empty list and an environment attribute to store the necessary datasets.
#' * `sm_is_empty()`: Return a `logical` vector indicating if each computed
#' metric is empty.
#'
#' @seealso `sm_compute()`
#'
#' @examples
#' # load sample datasets
#' data("sample_ref_sf", package = "segmetric")
#' data("sample_seg_sf", package = "segmetric")
#'
#' # create segmetric object
#' m <- sm_read(ref_sf = sample_ref_sf, seg_sf = sample_seg_sf)
#'
#' # plot geometries
#' plot(m)
#'
#' # compute a metric
#' sm_compute(m, "AFI")
#'
#' # summarize the metric using mean
#' sm_compute(m, "AFI") %>% summary()
#'
#' # clear computed subsets
#' sm_clear(m)
#'
NULL
#' @rdname segmetric_functions
#' @keywords internal
.segmetric_check <- function(m) {
stopifnot(inherits(m, "segmetric"))
stopifnot(all(c("ref_sf", "seg_sf") %in% ls(.segmetric_env(m))))
if (length(m) > 1) {
stopifnot(!is.null(names(m)))
stopifnot(names(m) %in% .db_list())
}
}
#' @rdname segmetric_functions
#' @keywords internal
.segmetric_env <- function(m) {
attr(m, which = ".env", exact = TRUE)
}
#' @export
#' @rdname segmetric_functions
sm_read <- function(ref_sf, seg_sf) {
if (is.character(ref_sf))
ref_sf <- sf::read_sf(ref_sf)
stopifnot(inherits(ref_sf, "sf"))
if (any(!sf::st_is_valid(ref_sf))) {
stop(paste(
"reference dataset has invalid geometries.",
"Please, fix the dataset using sf::st_make_valid().",
sep = "\n"
), call. = FALSE)
}
if (is.character(seg_sf))
seg_sf <- sf::read_sf(seg_sf)
stopifnot(inherits(seg_sf, "sf"))
if (any(!sf::st_is_valid(seg_sf))) {
stop(paste(
"segmentation dataset has invalid geometries.",
"Please, fix the dataset using sf::st_make_valid().",
sep = "\n"
), call. = FALSE)
}
stopifnot(sf::st_crs(ref_sf) == sf::st_crs(seg_sf))
ref_sf <- suppressWarnings(
sf::st_sf(ref_id = seq_len(nrow(ref_sf)),
geometry = sf::st_geometry(ref_sf),
sf_column_name = "geometry")
)
seg_sf <- suppressWarnings(
sf::st_sf(seg_id = seq_len(nrow(seg_sf)),
geometry = sf::st_geometry(seg_sf),
sf_column_name = "geometry")
)
class(ref_sf) <- unique(c("ref_sf", class(ref_sf)))
class(seg_sf) <- unique(c("seg_sf", class(seg_sf)))
.env <- environment()
structure(list(),
.env = .env,
class = "segmetric")
}
#' @export
#' @rdname segmetric_functions
sm_clear <- function(m) {
subsets <- sm_list(m)
subsets <- subsets[!subsets %in% c("ref_sf", "seg_sf")]
rm(list = subsets, envir = .segmetric_env(m), inherits = FALSE)
structure(list(),
.env = .segmetric_env(m),
class = "segmetric")
}
#' @exportS3Method
print.segmetric <- function(x, ...) {
print(c(x))
}
#' @title Plot function
#'
#' @name plot
#'
#' @description
#' Plot a segmetric map according to the parameter `type`:
#' * `"base"`: simple plot of the reference or segmentation polygons;
#' * `"subset"`: plot polygons from a subset over the base plot;
#' * `"choropleth"`: plot a choropleth map from polygons of a subset using
#' metric values.
#'
#' @param x A `segmetric` object.
#' @param type A `character`. Either `"base"`, `"subset"`, or `"choropleth"`.
#' @param ... Ignored.
#' @param title A `character` with plot title
#' @param layers A `character`. One or both of `"ref_sf"` and `"seg_sf"`
#' (works only for `type = "base"` and `type = "subset"`).
#' @param ref_color,seg_color,ref_fill,seg_fill A `character` with a
#' valid hexadecimal color in `rgb` or `rgba` format. Set the border and fill
#' colors for reference and segmentation polygons.
#' @param ref_label,seg_label,centroids_label A `character` with legend
#' labels for reference polygons, segmentation polygons, and centroids.
#' @param ref_size,seg_size A `numeric`. Set symbol's size for centroids.
#' @param ref_symbol,seg_symbol An `integer`. Symbol to represent polygons'
#' centroids (see `pch` param in \link[graphics]{points}).
#' @param selected_fill A `character` with a valid hexadecimal color in `rgb`
#' or `rgba` format. Set the fill color of selected reference or
#' segmentation polygons depending on `subset_id`.
#' @param plot_centroids A `logical`. Plot centroids or not.
#' @param centroids_color A `character` with a valid hexadecimal color
#' in `rgb` or `rgba` format. Set the border colors for centroids.
#' @param subset_id A `character` with subset name
#' (required for `type = "subset"`)
#' @param subset_color,subset_fill A `character` with a valid hexadecimal
#' color in `rgb` or `rgba` format. Set the border and fill
#' colors for subset polygons (works only with `type = "subset"`).
#' @param metric_id A `character` with metric to be plotted in choropleth maps
#' (required for `type = "choropleth"`)
#' @param break_style A `character` with the name of a method to compute
#' the intervals for choropleth maps. Can be one of `"sd"`, `"equal"`,
#' `"pretty"`, `"quantile"`, `"kmeans"`, `"hclust"`, `"bclust"`, `"fisher"`,
#' `"jenks"`, `"dpih"`, and `"headtails"` (see `style` parameter in
#' \link[classInt]{classIntervals}).
#' @param plot_extent A `sf` object. Set the map extent for a plot.
#' @param plot_legend A `logical`. Plot legend or not.
#' @param plot_axes A `logical`. Plot coordinates axis or not.
#' @param background A `character` with valid color used in graph's background.
#' @param choropleth_palette A `character` with a valid palette to be used
#' in choropleth plots.
#' @param choropleth_palette_reverse A `logical` indicating if palette should
#' be generated in reversely.
#' @param choropleth_size A `numeric` with border size used to plot polygons.
#'
#' @exportS3Method
plot.segmetric <- function(x, type = "base", ...,
title = NULL,
layers = c("ref_sf", "seg_sf"),
background = "#FFFFFF",
ref_color = "#FF00009F",
ref_fill = "#FFFFFF00",
ref_label = "reference",
ref_size = 2,
ref_symbol = 2,
seg_color = "#0000009F",
seg_fill = "#FFFFFF00",
seg_label = "segment",
seg_size = 1,
seg_symbol = 3,
selected_fill = "#9A9AFF50",
plot_centroids = TRUE,
centroids_color = "#000000FF",
centroids_label = "centroid",
subset_id = NULL,
subset_color = "#FFFFFF00",
subset_fill = "#F0E4167F",
metric_id = NULL,
break_style = "jenks",
choropleth_palette = "YlGnBu",
choropleth_palette_reverse = FALSE,
choropleth_size = 0.1,
plot_extent = NULL,
plot_legend = TRUE,
plot_axes = TRUE) {
mod_extent <- function(x, factor) {
x[[2]] <- x[[2]] - (x[[4]] - x[[2]]) * factor
x
}
if (type == "base") {
if (!is.character(title))
title <- NULL
# prepare format parameters
labels <- c()
fill <- c()
border <- c()
symbols <- c()
symbols_color <- c()
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 2
data <- rbind(ref_sf, seg_sf)
labels <- c(ref_label, seg_label)
fill <- c(ref_fill, seg_fill)
border <- c(ref_color, seg_color)
symbols <- c(NA, NA)
symbols_color <- c(NA, NA)
size <- c(ref_size, seg_size)
} else if ("ref_sf" %in% layers) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
data <- ref_sf
labels <- c(ref_label)
fill <- ref_fill
border <- c(ref_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- ref_size
} else if ("seg_sf" %in% layers) {
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 1
data <- seg_sf
labels <- c(seg_label)
fill <- seg_fill
border <- c(seg_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- seg_size
} else {
stop("Invalid layers parameter")
}
# adjust plot spatial extent
if (is.null(plot_extent))
plot_extent <- sf::st_bbox(data)
else
plot_extent <- sf::st_bbox(plot_extent)
if (plot_legend)
plot_extent <- mod_extent(plot_extent, factor = 0.167)
# main plot
plot(data,
main = title,
bg = background,
col = fill[data[["type"]]],
border = border[data[["type"]]],
lwd = size[data[["type"]]],
extent = plot_extent,
axes = plot_axes,
reset = FALSE)
# plot centroids
if (plot_centroids) {
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
labels <- c(labels, paste(labels, centroids_label))
fill <- c(fill, NA, NA)
border <- c(border, NA, NA)
symbols <- c(symbols, ref_symbol, seg_symbol)
symbols_color <- c(symbols_color, centroids_color,
centroids_color)
} else if ("ref_sf" %in% layers) {
labels <- c(labels, paste(labels, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, ref_symbol)
symbols_color <- c(symbols_color, centroids_color)
} else if ("seg_sf" %in% layers) {
labels <- c(labels, paste(labels, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, seg_symbol)
symbols_color <- c(symbols_color, centroids_color)
}
plot(sf::st_centroid(sf::st_geometry(ref_sf)),
pch = ref_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
plot(sf::st_centroid(sf::st_geometry(seg_sf)),
pch = seg_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
}
if (plot_legend) {
graphics::legend(
"bottom",
legend = labels,
fill = fill,
border = border,
pch = symbols,
col = symbols_color,
ncol = 2,
bty = "n",
bg = NA)
}
} else if (type == "subset") {
if (!sm_exists(x, subset_id = subset_id))
stop(paste0("subset '", subset_id, "' not found"))
subset <- sm_subset(x, subset_id = subset_id)
if (!is.character(title))
title <- NULL
# prepare format parameters
labels <- c()
fill <- c()
border <- c()
symbols <- c()
symbols_color <- c()
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 2
data <- rbind(ref_sf, seg_sf)
labels <- c(ref_label, seg_label)
fill <- c(ref_fill, seg_fill)
border <- c(ref_color, seg_color)
symbols <- c(NA, NA)
symbols_color <- c(NA, NA)
size <- c(ref_size, seg_size)
} else if ("ref_sf" %in% layers) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
data <- ref_sf
labels <- c(ref_label)
fill <- ref_fill
border <- c(ref_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- ref_size
} else if ("seg_sf" %in% layers) {
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 1
data <- seg_sf
labels <- c(seg_label)
fill <- seg_fill
border <- c(seg_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- seg_size
} else {
stop("Invalid layers parameter")
}
# adjust plot spatial extent
if (is.null(plot_extent))
plot_extent <- sf::st_bbox(data)
else
plot_extent <- sf::st_bbox(plot_extent)
if (plot_legend)
plot_extent <- mod_extent(plot_extent, factor = 0.167)
# main plot
plot(data,
main = title,
bgc = background,
col = fill[data[["type"]]],
border = border[data[["type"]]],
lwd = size[data[["type"]]],
extent = plot_extent,
axes = plot_axes,
reset = FALSE)
# prepare plot of the subset
if (colnames(subset)[2] == "ref_id") {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- length(fill) + 1
rows <- unique(sm_inset(sm_ref(x), subset, return_index = TRUE))
ref_sf <- ref_sf[rows, ]
data <- ref_sf
labels <- c(labels, paste("selected", ref_label))
fill <- c(fill, selected_fill)
border <- c(border, ref_color)
symbols <- c(symbols, NA)
symbols_color <- c(symbols_color, NA)
size <- c(size, ref_size)
} else if (colnames(subset)[2] == "seg_id") {
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- length(fill) + 1
rows <- unique(sm_inset(sm_seg(x), subset, return_index = TRUE))
seg_sf <- seg_sf[rows, ]
data <- seg_sf
labels <- c(labels, paste("selected", seg_label))
fill <- c(fill, selected_fill)
border <- c(border, seg_color)
symbols <- c(symbols, NA)
symbols_color <- c(symbols_color, NA)
size <- c(size, seg_size)
} else {
stop("Invalid subset value")
}
# Plot of the subset.
plot(data,
col = fill[data[["type"]]],
border = border[data[["type"]]],
lwd = size[data[["type"]]],
add = TRUE
)
# plot centroids
if (plot_centroids) {
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
labels <- c(labels, paste(c(ref_label, seg_label),
centroids_label))
fill <- c(fill, NA, NA)
border <- c(border, NA, NA)
symbols <- c(symbols, ref_symbol, seg_symbol)
symbols_color <- c(symbols_color, centroids_color,
centroids_color)
} else if ("ref_sf" %in% layers) {
labels <- c(labels, paste(ref_label, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, ref_symbol)
symbols_color <- c(symbols_color, centroids_color)
} else if ("seg_sf" %in% layers) {
labels <- c(labels, paste(seg_label, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, seg_symbol)
symbols_color <- c(symbols_color, centroids_color)
}
plot(sf::st_centroid(sf::st_geometry(ref_sf)),
pch = ref_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
plot(sf::st_centroid(sf::st_geometry(seg_sf)),
pch = seg_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
}
# Plot intersection
data <- sm_subset(x, subset_id = subset_id)
plot(sf::st_geometry(data),
col = subset_fill,
border = subset_color,
add = TRUE)
if (plot_legend) {
labels <- c(labels, "intersection")
fill <- c(fill, subset_fill)
border <- c(border, subset_color)
symbols <- c(symbols, NA)
symbols_color <- c(symbols_color, NA)
graphics::legend(
x = "bottom",
legend = labels,
fill = fill,
border = border,
pch = symbols,
col = symbols_color,
ncol = 2,
bty = "n",
bg = NA
)
}
} else if (type == "choropleth") {
stopifnot(requireNamespace("classInt"))
supported_styles <- c("sd", "equal", "pretty",
"quantile", "kmeans", "hclust",
"bclust", "fisher", "jenks",
"dpih", "headtails")
break_style <- break_style[[1]]
stopifnot(break_style %in% supported_styles)
# Compute metrics
x <- sm_compute(x, metric_id = metric_id)
s_lst <- sm_metric_subset(round(x), metric_id = metric_id)
for (m_name in names(s_lst)) {
nbreaks <- max(
min(10, nrow(s_lst[[m_name]])),
ceiling(log2(nrow(s_lst[[m_name]])))
)
breaks <- unique(
classInt::classIntervals(
var = s_lst[[m_name]][[ m_name]],
n = nbreaks,
style = break_style)$brks
)
title_metric <- title
if (is.null(title))
title_metric <- .db_get(m_name)[["name"]]
# adjust plot spatial extent
if (is.null(plot_extent))
plot_extent <- sf::st_bbox(s_lst[[m_name]])
else
plot_extent <- sf::st_bbox(plot_extent)
# generate palette colors
colors <- hcl.colors(
n = length(breaks) - 1,
palette = choropleth_palette,
rev = .db_get(m_name)[["optimal"]] == 0)
# reverse colors
if (choropleth_palette_reverse)
colors <- rev(colors)
plot(
s_lst[[m_name]][, m_name],
main = title_metric,
bgc = background,
breaks = breaks,
lwd = choropleth_size,
pal = colors,
extent = plot_extent,
axes = plot_axes
)
}
}
}
#' @exportS3Method
round.segmetric <- function(x, digits = 8) {
val <- lapply(x, round, digits = digits)
structure(val,
.env = .segmetric_env(x),
class = c("segmetric"))
}
.sm_weight <- function(x, weight, na_rm) {
if (length(x) == 1) return(x)
if (!is.null(weight))
stats::weighted.mean(x = x, w = weight, na.rm = na_rm)
else
mean(x = x, na.rm = na_rm)
}
#' @exportS3Method
#' @rdname segmetric_functions
summary.segmetric <- function(object, weight = NULL, na_rm = TRUE, ...) {
stopifnot(inherits(object, "segmetric"))
value <- vapply(names(object), function(metric_id) {
f <- .db_get(metric_id)
if (!f[["summarizable"]]) {
warning("metric '", metric_id, "' was not proposed ",
"to be aggregated for the whole segmentation output",
call. = FALSE)
}
if (is.character(weight)) {
fn_subset <- f[["fn_subset"]]
weight <- switch(
weight,
"ref" = sm_area(sm_ref(object), order = fn_subset(object)),
"seg" = sm_area(sm_seg(object), order = fn_subset(object)),
"inter" = sm_area(fn_subset(object)),
stop("invalid 'weight' parameter")
)
}
if (!is.null(weight)) stopifnot(is.numeric(weight))
.sm_weight(object[[metric_id]], weight = weight, na_rm = na_rm)
}, numeric(1), USE.NAMES = FALSE)
if (length(object) <= 1) return(value)
names(value) <- names(object)
return(value)
}
#' @export
#' @rdname segmetric_functions
sm_is_empty <- function(m) {
result <- vapply(m, function(x) {
is.null(x) || length(x) == 0 ||
(length(x) == 1 && (is.nan(x) || is.na(x)))
}, logical(1))
if (length(result) <= 1)
return(unname(result))
result
}
#' @export
#' @rdname segmetric_functions
`[.segmetric` <- function(x, i) {
.segmetric_check(x)
if (is.character(i)) {
stopifnot(all(i %in% names(x)))
} else if (is.numeric(i)) {
stopifnot(max(i) <= length(x))
} else if (is.logical(i)) {
stopifnot(length(i) == length(x))
} else {
stop("object of type ", typeof(i), " cannot be used as an index")
}
structure(
c(x)[i],
.env = .segmetric_env(x),
class = c("segmetric")
)
}
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Defines functions `[.segmetric` sm_is_empty summary.segmetric .sm_weight round.segmetric plot.segmetric print.segmetric sm_clear sm_read .segmetric_env .segmetric_check
Documented in plot.segmetric .segmetric_check .segmetric_env sm_clear sm_is_empty sm_read summary.segmetric
#' @title General functions
#'
#' @name segmetric_functions
#'
#' @description
#' These functions manipulate `segmetric` objects.
#' * `sm_read()`: Load the reference and segmentation polygons into segmetric.
#' * `sm_clear()`: Remove the already calculated metrics from segmetric.
#' * `print()`: Print a segmetric object.
#' * `plot()`: Plot the reference and segmentation polygons.
#' * `summary()`: Compute a measure of central tendency over the values of a metric.
#' * `sm_is_empty()`: Check if a `segmetric` object is empty.
#'
#' @param m A `segmetric` object.
#' @param object A `segmetric` object.
#' @param ref_sf A `sf` object. The reference polygons.
#' @param seg_sf A `sf` object. The segmentation polygons.
#' @param ... Additional parameters (Not implemented).
#' @param weight Weights to summarize metrics. Accepts `character` options
#' `"ref"`, `"seg"`, and `"inter"`, that weights using reference, segment,
#' and intersection areas, respectively. Also accepts a `numeric` vector
#' of weights of the same length as input metrics giving the weights to
#' be used.
#' @param na_rm Should missing values (including `NaN`) be removed?
#'
#' @returns
#' * `sm_read()`, `sm_clear()`: Return a `segmetric` object containing an
#' empty list and an environment attribute to store the necessary datasets.
#' * `sm_is_empty()`: Return a `logical` vector indicating if each computed
#' metric is empty.
#'
#' @seealso `sm_compute()`
#'
#' @examples
#' # load sample datasets
#' data("sample_ref_sf", package = "segmetric")
#' data("sample_seg_sf", package = "segmetric")
#'
#' # create segmetric object
#' m <- sm_read(ref_sf = sample_ref_sf, seg_sf = sample_seg_sf)
#'
#' # plot geometries
#' plot(m)
#'
#' # compute a metric
#' sm_compute(m, "AFI")
#'
#' # summarize the metric using mean
#' sm_compute(m, "AFI") %>% summary()
#'
#' # clear computed subsets
#' sm_clear(m)
#'
NULL
#' @rdname segmetric_functions
#' @keywords internal
.segmetric_check <- function(m) {
stopifnot(inherits(m, "segmetric"))
stopifnot(all(c("ref_sf", "seg_sf") %in% ls(.segmetric_env(m))))
if (length(m) > 1) {
stopifnot(!is.null(names(m)))
stopifnot(names(m) %in% .db_list())
}
}
#' @rdname segmetric_functions
#' @keywords internal
.segmetric_env <- function(m) {
attr(m, which = ".env", exact = TRUE)
}
#' @export
#' @rdname segmetric_functions
sm_read <- function(ref_sf, seg_sf) {
if (is.character(ref_sf))
ref_sf <- sf::read_sf(ref_sf)
stopifnot(inherits(ref_sf, "sf"))
if (any(!sf::st_is_valid(ref_sf))) {
stop(paste(
"reference dataset has invalid geometries.",
"Please, fix the dataset using sf::st_make_valid().",
sep = "\n"
), call. = FALSE)
}
if (is.character(seg_sf))
seg_sf <- sf::read_sf(seg_sf)
stopifnot(inherits(seg_sf, "sf"))
if (any(!sf::st_is_valid(seg_sf))) {
stop(paste(
"segmentation dataset has invalid geometries.",
"Please, fix the dataset using sf::st_make_valid().",
sep = "\n"
), call. = FALSE)
}
stopifnot(sf::st_crs(ref_sf) == sf::st_crs(seg_sf))
ref_sf <- suppressWarnings(
sf::st_sf(ref_id = seq_len(nrow(ref_sf)),
geometry = sf::st_geometry(ref_sf),
sf_column_name = "geometry")
)
seg_sf <- suppressWarnings(
sf::st_sf(seg_id = seq_len(nrow(seg_sf)),
geometry = sf::st_geometry(seg_sf),
sf_column_name = "geometry")
)
class(ref_sf) <- unique(c("ref_sf", class(ref_sf)))
class(seg_sf) <- unique(c("seg_sf", class(seg_sf)))
.env <- environment()
structure(list(),
.env = .env,
class = "segmetric")
}
#' @export
#' @rdname segmetric_functions
sm_clear <- function(m) {
subsets <- sm_list(m)
subsets <- subsets[!subsets %in% c("ref_sf", "seg_sf")]
rm(list = subsets, envir = .segmetric_env(m), inherits = FALSE)
structure(list(),
.env = .segmetric_env(m),
class = "segmetric")
}
#' @exportS3Method
print.segmetric <- function(x, ...) {
print(c(x))
}
#' @title Plot function
#'
#' @name plot
#'
#' @description
#' Plot a segmetric map according to the parameter `type`:
#' * `"base"`: simple plot of the reference or segmentation polygons;
#' * `"subset"`: plot polygons from a subset over the base plot;
#' * `"choropleth"`: plot a choropleth map from polygons of a subset using
#' metric values.
#'
#' @param x A `segmetric` object.
#' @param type A `character`. Either `"base"`, `"subset"`, or `"choropleth"`.
#' @param ... Ignored.
#' @param title A `character` with plot title
#' @param layers A `character`. One or both of `"ref_sf"` and `"seg_sf"`
#' (works only for `type = "base"` and `type = "subset"`).
#' @param ref_color,seg_color,ref_fill,seg_fill A `character` with a
#' valid hexadecimal color in `rgb` or `rgba` format. Set the border and fill
#' colors for reference and segmentation polygons.
#' @param ref_label,seg_label,centroids_label A `character` with legend
#' labels for reference polygons, segmentation polygons, and centroids.
#' @param ref_size,seg_size A `numeric`. Set symbol's size for centroids.
#' @param ref_symbol,seg_symbol An `integer`. Symbol to represent polygons'
#' centroids (see `pch` param in \link[graphics]{points}).
#' @param selected_fill A `character` with a valid hexadecimal color in `rgb`
#' or `rgba` format. Set the fill color of selected reference or
#' segmentation polygons depending on `subset_id`.
#' @param plot_centroids A `logical`. Plot centroids or not.
#' @param centroids_color A `character` with a valid hexadecimal color
#' in `rgb` or `rgba` format. Set the border colors for centroids.
#' @param subset_id A `character` with subset name
#' (required for `type = "subset"`)
#' @param subset_color,subset_fill A `character` with a valid hexadecimal
#' color in `rgb` or `rgba` format. Set the border and fill
#' colors for subset polygons (works only with `type = "subset"`).
#' @param metric_id A `character` with metric to be plotted in choropleth maps
#' (required for `type = "choropleth"`)
#' @param break_style A `character` with the name of a method to compute
#' the intervals for choropleth maps. Can be one of `"sd"`, `"equal"`,
#' `"pretty"`, `"quantile"`, `"kmeans"`, `"hclust"`, `"bclust"`, `"fisher"`,
#' `"jenks"`, `"dpih"`, and `"headtails"` (see `style` parameter in
#' \link[classInt]{classIntervals}).
#' @param plot_extent A `sf` object. Set the map extent for a plot.
#' @param plot_legend A `logical`. Plot legend or not.
#' @param plot_axes A `logical`. Plot coordinates axis or not.
#' @param background A `character` with valid color used in graph's background.
#' @param choropleth_palette A `character` with a valid palette to be used
#' in choropleth plots.
#' @param choropleth_palette_reverse A `logical` indicating if palette should
#' be generated in reversely.
#' @param choropleth_size A `numeric` with border size used to plot polygons.
#'
#' @exportS3Method
plot.segmetric <- function(x, type = "base", ...,
title = NULL,
layers = c("ref_sf", "seg_sf"),
background = "#FFFFFF",
ref_color = "#FF00009F",
ref_fill = "#FFFFFF00",
ref_label = "reference",
ref_size = 2,
ref_symbol = 2,
seg_color = "#0000009F",
seg_fill = "#FFFFFF00",
seg_label = "segment",
seg_size = 1,
seg_symbol = 3,
selected_fill = "#9A9AFF50",
plot_centroids = TRUE,
centroids_color = "#000000FF",
centroids_label = "centroid",
subset_id = NULL,
subset_color = "#FFFFFF00",
subset_fill = "#F0E4167F",
metric_id = NULL,
break_style = "jenks",
choropleth_palette = "YlGnBu",
choropleth_palette_reverse = FALSE,
choropleth_size = 0.1,
plot_extent = NULL,
plot_legend = TRUE,
plot_axes = TRUE) {
mod_extent <- function(x, factor) {
x[[2]] <- x[[2]] - (x[[4]] - x[[2]]) * factor
x
}
if (type == "base") {
if (!is.character(title))
title <- NULL
# prepare format parameters
labels <- c()
fill <- c()
border <- c()
symbols <- c()
symbols_color <- c()
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 2
data <- rbind(ref_sf, seg_sf)
labels <- c(ref_label, seg_label)
fill <- c(ref_fill, seg_fill)
border <- c(ref_color, seg_color)
symbols <- c(NA, NA)
symbols_color <- c(NA, NA)
size <- c(ref_size, seg_size)
} else if ("ref_sf" %in% layers) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
data <- ref_sf
labels <- c(ref_label)
fill <- ref_fill
border <- c(ref_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- ref_size
} else if ("seg_sf" %in% layers) {
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 1
data <- seg_sf
labels <- c(seg_label)
fill <- seg_fill
border <- c(seg_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- seg_size
} else {
stop("Invalid layers parameter")
}
# adjust plot spatial extent
if (is.null(plot_extent))
plot_extent <- sf::st_bbox(data)
else
plot_extent <- sf::st_bbox(plot_extent)
if (plot_legend)
plot_extent <- mod_extent(plot_extent, factor = 0.167)
# main plot
plot(data,
main = title,
bg = background,
col = fill[data[["type"]]],
border = border[data[["type"]]],
lwd = size[data[["type"]]],
extent = plot_extent,
axes = plot_axes,
reset = FALSE)
# plot centroids
if (plot_centroids) {
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
labels <- c(labels, paste(labels, centroids_label))
fill <- c(fill, NA, NA)
border <- c(border, NA, NA)
symbols <- c(symbols, ref_symbol, seg_symbol)
symbols_color <- c(symbols_color, centroids_color,
centroids_color)
} else if ("ref_sf" %in% layers) {
labels <- c(labels, paste(labels, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, ref_symbol)
symbols_color <- c(symbols_color, centroids_color)
} else if ("seg_sf" %in% layers) {
labels <- c(labels, paste(labels, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, seg_symbol)
symbols_color <- c(symbols_color, centroids_color)
}
plot(sf::st_centroid(sf::st_geometry(ref_sf)),
pch = ref_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
plot(sf::st_centroid(sf::st_geometry(seg_sf)),
pch = seg_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
}
if (plot_legend) {
graphics::legend(
"bottom",
legend = labels,
fill = fill,
border = border,
pch = symbols,
col = symbols_color,
ncol = 2,
bty = "n",
bg = NA)
}
} else if (type == "subset") {
if (!sm_exists(x, subset_id = subset_id))
stop(paste0("subset '", subset_id, "' not found"))
subset <- sm_subset(x, subset_id = subset_id)
if (!is.character(title))
title <- NULL
# prepare format parameters
labels <- c()
fill <- c()
border <- c()
symbols <- c()
symbols_color <- c()
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 2
data <- rbind(ref_sf, seg_sf)
labels <- c(ref_label, seg_label)
fill <- c(ref_fill, seg_fill)
border <- c(ref_color, seg_color)
symbols <- c(NA, NA)
symbols_color <- c(NA, NA)
size <- c(ref_size, seg_size)
} else if ("ref_sf" %in% layers) {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- 1
data <- ref_sf
labels <- c(ref_label)
fill <- ref_fill
border <- c(ref_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- ref_size
} else if ("seg_sf" %in% layers) {
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- 1
data <- seg_sf
labels <- c(seg_label)
fill <- seg_fill
border <- c(seg_color)
symbols <- c(NA)
symbols_color <- c(NA)
size <- seg_size
} else {
stop("Invalid layers parameter")
}
# adjust plot spatial extent
if (is.null(plot_extent))
plot_extent <- sf::st_bbox(data)
else
plot_extent <- sf::st_bbox(plot_extent)
if (plot_legend)
plot_extent <- mod_extent(plot_extent, factor = 0.167)
# main plot
plot(data,
main = title,
bgc = background,
col = fill[data[["type"]]],
border = border[data[["type"]]],
lwd = size[data[["type"]]],
extent = plot_extent,
axes = plot_axes,
reset = FALSE)
# prepare plot of the subset
if (colnames(subset)[2] == "ref_id") {
ref_sf <- sm_ref(x)[-1]
ref_sf[["type"]] <- length(fill) + 1
rows <- unique(sm_inset(sm_ref(x), subset, return_index = TRUE))
ref_sf <- ref_sf[rows, ]
data <- ref_sf
labels <- c(labels, paste("selected", ref_label))
fill <- c(fill, selected_fill)
border <- c(border, ref_color)
symbols <- c(symbols, NA)
symbols_color <- c(symbols_color, NA)
size <- c(size, ref_size)
} else if (colnames(subset)[2] == "seg_id") {
seg_sf <- sm_seg(x)[-1]
seg_sf[["type"]] <- length(fill) + 1
rows <- unique(sm_inset(sm_seg(x), subset, return_index = TRUE))
seg_sf <- seg_sf[rows, ]
data <- seg_sf
labels <- c(labels, paste("selected", seg_label))
fill <- c(fill, selected_fill)
border <- c(border, seg_color)
symbols <- c(symbols, NA)
symbols_color <- c(symbols_color, NA)
size <- c(size, seg_size)
} else {
stop("Invalid subset value")
}
# Plot of the subset.
plot(data,
col = fill[data[["type"]]],
border = border[data[["type"]]],
lwd = size[data[["type"]]],
add = TRUE
)
# plot centroids
if (plot_centroids) {
# prepare data layers
if (all(c("ref_sf", "seg_sf") %in% layers)) {
labels <- c(labels, paste(c(ref_label, seg_label),
centroids_label))
fill <- c(fill, NA, NA)
border <- c(border, NA, NA)
symbols <- c(symbols, ref_symbol, seg_symbol)
symbols_color <- c(symbols_color, centroids_color,
centroids_color)
} else if ("ref_sf" %in% layers) {
labels <- c(labels, paste(ref_label, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, ref_symbol)
symbols_color <- c(symbols_color, centroids_color)
} else if ("seg_sf" %in% layers) {
labels <- c(labels, paste(seg_label, centroids_label))
fill <- c(fill, NA)
border <- c(border, NA)
symbols <- c(symbols, seg_symbol)
symbols_color <- c(symbols_color, centroids_color)
}
plot(sf::st_centroid(sf::st_geometry(ref_sf)),
pch = ref_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
plot(sf::st_centroid(sf::st_geometry(seg_sf)),
pch = seg_symbol,
col = centroids_color,
lwd = 1,
add = TRUE)
}
# Plot intersection
data <- sm_subset(x, subset_id = subset_id)
plot(sf::st_geometry(data),
col = subset_fill,
border = subset_color,
add = TRUE)
if (plot_legend) {
labels <- c(labels, "intersection")
fill <- c(fill, subset_fill)
border <- c(border, subset_color)
symbols <- c(symbols, NA)
symbols_color <- c(symbols_color, NA)
graphics::legend(
x = "bottom",
legend = labels,
fill = fill,
border = border,
pch = symbols,
col = symbols_color,
ncol = 2,
bty = "n",
bg = NA
)
}
} else if (type == "choropleth") {
stopifnot(requireNamespace("classInt"))
supported_styles <- c("sd", "equal", "pretty",
"quantile", "kmeans", "hclust",
"bclust", "fisher", "jenks",
"dpih", "headtails")
break_style <- break_style[[1]]
stopifnot(break_style %in% supported_styles)
# Compute metrics
x <- sm_compute(x, metric_id = metric_id)
s_lst <- sm_metric_subset(round(x), metric_id = metric_id)
for (m_name in names(s_lst)) {
nbreaks <- max(
min(10, nrow(s_lst[[m_name]])),
ceiling(log2(nrow(s_lst[[m_name]])))
)
breaks <- unique(
classInt::classIntervals(
var = s_lst[[m_name]][[ m_name]],
n = nbreaks,
style = break_style)$brks
)
title_metric <- title
if (is.null(title))
title_metric <- .db_get(m_name)[["name"]]
# adjust plot spatial extent
if (is.null(plot_extent))
plot_extent <- sf::st_bbox(s_lst[[m_name]])
else
plot_extent <- sf::st_bbox(plot_extent)
# generate palette colors
colors <- hcl.colors(
n = length(breaks) - 1,
palette = choropleth_palette,
rev = .db_get(m_name)[["optimal"]] == 0)
# reverse colors
if (choropleth_palette_reverse)
colors <- rev(colors)
plot(
s_lst[[m_name]][, m_name],
main = title_metric,
bgc = background,
breaks = breaks,
lwd = choropleth_size,
pal = colors,
extent = plot_extent,
axes = plot_axes
)
}
}
}
#' @exportS3Method
round.segmetric <- function(x, digits = 8) {
val <- lapply(x, round, digits = digits)
structure(val,
.env = .segmetric_env(x),
class = c("segmetric"))
}
.sm_weight <- function(x, weight, na_rm) {
if (length(x) == 1) return(x)
if (!is.null(weight))
stats::weighted.mean(x = x, w = weight, na.rm = na_rm)
else
mean(x = x, na.rm = na_rm)
}
#' @exportS3Method
#' @rdname segmetric_functions
summary.segmetric <- function(object, weight = NULL, na_rm = TRUE, ...) {
stopifnot(inherits(object, "segmetric"))
value <- vapply(names(object), function(metric_id) {
f <- .db_get(metric_id)
if (!f[["summarizable"]]) {
warning("metric '", metric_id, "' was not proposed ",
"to be aggregated for the whole segmentation output",
call. = FALSE)
}
if (is.character(weight)) {
fn_subset <- f[["fn_subset"]]
weight <- switch(
weight,
"ref" = sm_area(sm_ref(object), order = fn_subset(object)),
"seg" = sm_area(sm_seg(object), order = fn_subset(object)),
"inter" = sm_area(fn_subset(object)),
stop("invalid 'weight' parameter")
)
}
if (!is.null(weight)) stopifnot(is.numeric(weight))
.sm_weight(object[[metric_id]], weight = weight, na_rm = na_rm)
}, numeric(1), USE.NAMES = FALSE)
if (length(object) <= 1) return(value)
names(value) <- names(object)
return(value)
}
#' @export
#' @rdname segmetric_functions
sm_is_empty <- function(m) {
result <- vapply(m, function(x) {
is.null(x) || length(x) == 0 ||
(length(x) == 1 && (is.nan(x) || is.na(x)))
}, logical(1))
if (length(result) <= 1)
return(unname(result))
result
}
#' @export
#' @rdname segmetric_functions
`[.segmetric` <- function(x, i) {
.segmetric_check(x)
if (is.character(i)) {
stopifnot(all(i %in% names(x)))
} else if (is.numeric(i)) {
stopifnot(max(i) <= length(x))
} else if (is.logical(i)) {
stopifnot(length(i) == length(x))
} else {
stop("object of type ", typeof(i), " cannot be used as an index")
}
structure(
c(x)[i],
.env = .segmetric_env(x),
class = c("segmetric")
)
}
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