The biggest event for me this year was completely outside of work and had nothing to do with statistics or R: I got married. We technically met at the Open Stats meetup and I did build our wedding website with RMarkdown, so R was still involved. We just returned from our around-the-world honeymoon so I thought the best way to track our travels would be with maps and globes using
Before we get to any code, the following packages were used in making this post.
This was an extensive trip that, in addition to traditional vacation activities, included a few visits to clients and speaking and a few conferences and meetups. In all, we visited, London, Singapore, Hong Kong, Auckland, Queenstown, Bora Bora, Tahiti, Moorea, San Jose and San Francisco, with a connection or two in between.
The airport/ferry codes for our trip were the following.
|AKL||ZQN||Air New Zealand|
|ZQN||AKL||Air New Zealand|
|AKL||PPT||Air New Zealand|
|PPT||LAX||Air Tahiti Nui|
Converting these to latitude and longitude is easy thanks to Open Flights.
# read in the data airports <- readr::read_csv('https://raw.githubusercontent.com/jpatokal/openflights/master/data/airports-extended.dat', # give it good column names since the data are headerless col_names=c('ID', 'Name', 'City', 'Country', 'IATA', 'ICAO', 'Latitude', 'Longitude', 'Altitude', 'Timezone', 'DST', 'Tz', 'Type', 'Source'))
We then use
filter to get just the ports we visited. Notice how we use a second
visited <- airports %>% select(Name, City, Country, IATA, Latitude, Longitude) %>% filter(IATA %in% (codes %>% select(Origin, Destination) %>% unlist))
DT::datatable(visited, elementId='AirportsTable', rownames=FALSE, extensions=c('FixedHeader', 'Scroller'), options=list( dom='<"top"f>rt<"bottom"i><"clear">' , scrollY=200, scroller=TRUE ) ) %>% DT::formatRound(columns=c('Latitude', 'Longitude'), digits=2)
We then manually reorder the airports so that edges can be drawn nicely between them. This is akin to creating an edgelist of airport-pairs. This is not the most robust way of creating this list, but suffices for our purposes.
visitedOrdered <- visited %>% slice(c(12, 1, 2, 8, 7, 5, 6, 5, 13, 3, 4, 13, 10, 11, 12))
For the first visualization let’s create a map using
# initialize the widget leaflet(data=visitedOrdered) %>% # overlay map tiles addTiles() %>% # plot lines from one point to another addPolylines(lng=~Longitude, lat=~Latitude) %>% # add markers with city names addMarkers(lng=~Longitude, lat=~Latitude, popup=~City)
Unfortunately, this doesn’t quite capture the directions of the flights as it makes it look like we flew back west to get to Papeete. So let’s try a globe instead using
We augment the edgelist of airports so that it has the latitude and longitude of the origin and destination airports for each flight.
flightPaths <- codes %>% left_join(visited %>% select(IATA, Longitude, Latitude), by=c('Origin'='IATA')) %>% rename(oLong=Longitude, oLat=Latitude) %>% left_join(visited %>% select(IATA, Longitude, Latitude), by=c('Destination'='IATA')) %>% rename(dLong=Longitude, dLat=Latitude)
DT::datatable(visited, elementId='FlightPathLatLong', rownames=FALSE, extensions=c('FixedHeader', 'Scroller'), options=list( dom='<"top"f>rt<"bottom"i><"clear">' , scrollY=200, scroller=TRUE ) ) %>% DT::formatRound(columns=c('Latitude', 'Longitude'), digits=2)
Now we can provide that data to
threejs. We first specify an image to overlay on the globe. Then we specify the latitude and longitude of visited airports. After that, we provide the origin and destination latitudes and longitudes of our flights. The rest of the arguments are cosmetic.
globejs( # the image to overlay on the globe img="http://eoimages.gsfc.nasa.gov/images/imagerecords/73000/73909/world.topo.bathy.200412.3x5400x2700.jpg", # lat/long of visited airports lat=visited$Latitude, long=visited$Longitude, # lat/long of origin and destination arcs=flightPaths %>% select(oLat, oLong, dLat, dLong), # cosmetic adjustments arcsHeight=.4, arcsLwd=7, arcsColor="red", arcsOpacity=.95, atmosphere=FALSE, fov=30, rotationlat=0.3, rotationlong=.8*pi)
We now calculate the total distance traveled (not including car trips) using Haversine Distance to account for the curvature of the Earth.
distHaversine(visitedOrdered %>% select(Longitude, Latitude), r=3959) %>% sum
##  28660.52
So we traveled 3,760 more miles than the circumference of the Earth.
Beyond the epic proportions of our travel, this honeymoon was outstanding from the sheer length, to the vastly different places we visited, to the food we ate and the sights we saw, to the activities we participated in, to the great people along the way. And, of course, it’s amazing to spend a month traveling with your favorite person.
Jared Lander is the Chief Data Scientist of Lander Analytics a New York data science firm, Adjunct Professor at Columbia University, Organizer of the New York Open Statistical Programming meetup and the New York R Conference and author of R for Everyone.