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global.R
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global.R
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library(shiny)
library(dplyr)
library(leaflet)
library(htmltools)
library(maps)
library(ggmap)
stations <- read.csv("npr_stations_list.csv", stringsAsFactors = FALSE) %>%
mutate(popup_content = paste0("<a href='http://www.", Website, "' style='color:#3399ff' target='_blank'>", Call.Sign, " (",
Frequency, " ", AM.FM, ")</a>"))
city_rollup <- stations %>%
group_by(City, State, Latitude, Longitude, Population) %>%
summarise(station_count = length(Call.Sign),
popup_content = paste(popup_content, collapse = "</br>")) %>%
mutate(keep = "TRUE")
state_rollup <- stations %>%
group_by(State) %>%
summarise(avg_lat = mean(Latitude), avg_lon = mean(Longitude),
station_count = length(Call.Sign),
popup_content = paste(popup_content, collapse = "</br>"))
earth.dist <- function (long1, lat1, long2, lat2) {rad <- pi/180
a1 <- lat1 * rad
a2 <- long1 * rad
b1 <- lat2 * rad
b2 <- long2 * rad
dlon <- b2 - a2
dlat <- b1 - a1
a <- (sin(dlat/2))^2 + cos(a1) * cos(b1) * (sin(dlon/2))^2
c <- 2 * atan2(sqrt(a), sqrt(1 - a))
R <- 3963.196
d <- R * c
return(d)
}
pickStationsOnRoute <- function(origin, destination, city_df) {
route_df <- route(from = origin,
to = destination,
mode = "driving",
structure = "route")
for(i in 1:nrow(city_df)) {
city_lat <- city_df$Latitude[i]
city_lon <- city_df$Longitude[i]
for(j in 1:nrow(route_df)) {
route_lat <- route_df$lat[j]
route_lon <- route_df$lon[j]
route_df$distances[j] <- earth.dist(city_lon, city_lat,
route_lon, route_lat)
}
city_df$keep[i] <- min(route_df$distances) <= 100
}
city_df_filtered <- city_df %>%
dplyr::filter(keep == "TRUE")
return(city_df_filtered)
}