Water or Land?

Randomly sampling places on earth

The function rgeo() works a bit like rflip(), but instead of randomly flipping coins, it randomly selects points on the earth. You can create 10 such points with

Places <- rgeo(10)
Places

##           lat        lon
## 1  -50.587328   69.69287
## 2   14.158126   16.19094
## 3   12.623850  -78.21591
## 4   14.285802  152.43605
## 5   46.205840  -74.76630
## 6   16.297284  121.42643
## 7  -78.815743  -76.95962
## 8  -32.337061  -83.94452
## 9   19.400388 -112.77980
## 10   1.633282  -96.39867

Replace the number 10 with some other number to generate a different number of points.

Mapping your positions

If you want to see these places on a map, you can do this

leaflet_map(position = Places, mark = TRUE)

Of course, you should see different random places on your map.

Recording your data

Zoom in on each of your positions and enter the information (latitude, longitude, and whether you are on land or in water) in this google form. You can click on the marker to reveal the latitude and longitude.

Confidence Interval

We can use the data to create a confidence interval for the proportion of the earth that is covered by water.

Looking at the data

Here is a map of the data we collected.