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| Package: dodgr | ||
| Title: Distances on Directed Graphs | ||
| Version: 0.3.0.033 | ||
| Version: 0.3.0.034 | ||
| Authors@R: c( | ||
| person("Mark", "Padgham", , "[email protected]", role = c("aut", "cre")), | ||
| person("Andreas", "Petutschnig", role = "aut"), | ||
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| #' Weight a network for routing along railways. | ||
| #' | ||
| #' Weight (or re-weight) an `sf`-formatted OSM street network for routing | ||
| #' along railways. | ||
| #' | ||
| #' @param x A street network represented either as `sf` `LINESTRING` | ||
| #' objects, typically extracted with \link{dodgr_streetnet}. | ||
| #' @param type_col Specify column of the `sf` `data.frame` object | ||
| #' which designates different types of railways to be used for weighting | ||
| #' (default works with `osmdata` objects). | ||
| #' @param id_col Specify column of the \pkg{sf} `data.frame` object which | ||
| #' provides unique identifiers for each railway (default works with | ||
| #' `osmdata` objects). | ||
| #' @param keep_cols Vectors of columns from `sf_lines` to be kept in the | ||
| #' resultant `dodgr` network; vector can be either names or indices of | ||
| #' desired columns. | ||
| #' @param excluded Types of railways to exclude from routing. | ||
| #' | ||
| #' @return A `data.frame` of edges representing the rail network, along | ||
| #' with a column of graph component numbers. | ||
| #' | ||
| #' @note Default railway weighting is by distance. Other weighting schemes, such | ||
| #' as by maximum speed, can be implemented simply by modifying the | ||
| #' `d_weighted` column returned by this function accordingly. | ||
| #' | ||
| #' @family extraction | ||
| #' @export | ||
| #' @examples | ||
| #' \dontrun{ | ||
| #' # sample railway extraction with the 'osmdata' package | ||
| #' library (osmdata) | ||
| #' dat <- opq ("shinjuku") %>% | ||
| #' add_osm_feature (key = "railway") %>% | ||
| #' osmdata_sf (quiet = FALSE) | ||
| #' graph <- weight_railway (dat$osm_lines) | ||
| #' } | ||
| weight_railway <- function (x, | ||
| type_col = "railway", | ||
| id_col = "osm_id", | ||
| keep_cols = c ("maxspeed"), | ||
| excluded = c ( | ||
| "abandoned", | ||
| "disused", | ||
| "proposed", | ||
| "razed" | ||
| )) { | ||
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| if (!is (x, "sf")) { | ||
| stop ('x must be class "sf"') | ||
| } | ||
| geom_column <- get_sf_geom_col (x) | ||
| attr (x, "sf_column") <- geom_column | ||
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| if (type_col != "railway") { | ||
| names (x) [which (names (x) == type_col)] <- "railway" | ||
| } | ||
| if (id_col != "osm_id") { | ||
| names (x) [which (names (x) == id_col)] <- "osm_id" | ||
| } # nocov | ||
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| if (!"railway" %in% names (x)) { | ||
| stop ("Please specify type_col to be used for weighting railway") | ||
| } | ||
| if (!"osm_id" %in% names (x)) { | ||
| stop ( | ||
| "Please specifiy id_col to be used to identify ", # nocov | ||
| "railway rows" | ||
| ) | ||
| } # nocov | ||
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| if (is.null (names (x$geometry))) { | ||
| names (x$geometry) <- x$osm_id | ||
| } # nocov | ||
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| x <- x [which (!(x$railway %in% excluded | is.na (x$railway))), ] | ||
| # routing is based on matching the given profile to the "highway" field of | ||
| # x, so: | ||
| x$highway <- x$railway | ||
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| wt_profile <- data.frame ( | ||
| name = "custom", | ||
| way = unique (x$highway), | ||
| value = 1, | ||
| stringsAsFactors = FALSE | ||
| ) | ||
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| dat <- rcpp_sf_as_network (x, pr = wt_profile) | ||
| graph <- data.frame ( | ||
| geom_num = dat$numeric_values [, 1] + 1, # 1-indexed! | ||
| edge_id = seq_len (nrow (dat$character_values)), | ||
| from_id = as.character (dat$character_values [, 1]), | ||
| from_lon = dat$numeric_values [, 2], | ||
| from_lat = dat$numeric_values [, 3], | ||
| to_id = as.character (dat$character_values [, 2]), | ||
| to_lon = dat$numeric_values [, 4], | ||
| to_lat = dat$numeric_values [, 5], | ||
| stringsAsFactors = FALSE | ||
| ) | ||
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| graph$d <- geodist::geodist (graph [, c ("from_lon", "from_lat")], | ||
| graph [, c ("to_lon", "to_lat")], | ||
| paired = TRUE, | ||
| measure = "geodesic" | ||
| ) | ||
| graph$d_weighted <- graph$d * dat$numeric_values [, 6] | ||
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| graph$highway <- as.character (dat$character_values [, 3]) | ||
| graph$way_id <- as.character (dat$character_values [, 4]) | ||
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| # rcpp_sf_as_network now flags non-routable ways with -1, so: | ||
| graph$d_weighted [graph$d_weighted < 0] <- .Machine$double.xmax | ||
| if (all (graph$highway == "")) { | ||
| graph$highway <- NULL | ||
| } # nocov | ||
| if (all (graph$way_id == "")) { | ||
| graph$way_id <- NULL | ||
| } # nocov | ||
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| # If original geometries did not have rownames (meaning it's not from | ||
| # osmdata), then reassign unique vertex from/to IDs based on coordinates | ||
| if (is.null (rownames (as.matrix (x$geometry [[1]])))) { | ||
| graph <- rownames_from_xy (graph) | ||
| } # nocov | ||
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| # get component numbers for each edge | ||
| class (graph) <- c (class (graph), "dodgr_streetnet") | ||
| graph <- dodgr_components (graph) | ||
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| # And finally, re-insert keep_cols: | ||
| if (length (keep_cols) > 0) { | ||
| graph <- reinsert_keep_cols (x, graph, keep_cols) | ||
| } | ||
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| return (graph) | ||
| } |
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