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library(ggmap) | |
library(ggplot2) | |
library(ggthemes) | |
library(dplyr) | |
require(data.table) | |
print("read GTFS data started") | |
# use fread for increased speed (~1GB shapes.txt) | |
shapes <- fread("[shapes_path]/shapes.txt", sep =",", encoding ="UTF-8") | |
print("read GTFS data finished") | |
print ("start map fetch") | |
lx_map <- get_stamenmap(bbox = c(left=2.8, bottom=53.95, right=32.26, top=71.53), source ="stamen", maptype = "toner-lite",color = "bw" ,scale = 2, zoom = 7) | |
print ("finished map fetch") | |
# plot the map with a line for each group of shapes (route). Had some scaling issues - work-around: use aspect.ratio 1.6 | |
print ("start map plotting") | |
plotted_map <- | |
ggsave(filename = "pt_map.png", | |
ggmap(lx_map, darken = 1) + | |
geom_path(data = shapes, | |
aes(shape_pt_lon, shape_pt_lat, group = shape_id), | |
size = .1, | |
alpha = .5, | |
color='red') + | |
theme(aspect.ratio=1.6, axis.line=element_blank(),axis.text.x=element_blank(), | |
axis.text.y=element_blank(),axis.ticks=element_blank(), | |
axis.title.x=element_blank(), | |
axis.title.y=element_blank(),legend.position="none", | |
panel.background=element_blank(),panel.border=element_blank(),panel.grid.major=element_blank(), | |
panel.grid.minor=element_blank(),plot.background=element_blank()), | |
device = "png", | |
path = "[image_path]", | |
height = 7, | |
width = 7 | |
) | |
print ("finished map plotting") |
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