Shinyapp using Marine Data

This is a Shinyapp made using Marine Data.

App description

This app:

• allows the user select a vessel type from a dropdown field (they are in alphabetical order)
• allows the user select a vessel from a dropdown field (available vessels correspond to the selected type). They are also in alphabetical order.
• finds, for the vessel selected, the observation when it sailed the longest distance between two consecutive observations. If there is a situation when a vessel moves exactly the same amount of meters, it selects the most recent.
• displays that on the map, showing two points: the beginning and the end of the movement. The points are colored based on whether the vessel was in movement or parked. Changing type and vessel name re-renders the map.
• provide a short note saying how much the ship sailed, in meters.

It also:

• provides a short note saying how much time passed between the observations.
• provides vessel information.
• allows the user to see the timestamps of the observations in the map by hovering over the points.

Details

pre_proc.R is a file used to pre process the data.

In particular, I read raw data using fread package and then, after some calculations, created some .RDS data files that are then loaded by the application. This allowed to upload files with small sizes to shinyapps.io.

One important thing to notice is that I created my own SHIP_ID variable, due to inconsistencies found with the provided one (different vessel names had the same SHIP_ID).