This is a Shiny app that allows you to visualize the sailed distance between two consecutive observations of a ship on a map. The app also allows the user to select the vessel type and vessel name to display the most recent distance sailed.

To run this app, you will need to have R installed. Once installed, you can install the necessary packages by running:

install.packages(c("shiny", "shinyWidgets", "shiny.semantic", "htmltools", "leaflet", "dplyr", "magrittr", "geosphere"))

After installing the required packages, download the ships.rds dataset and store it in your working directory.

To use the app, open R and navigate to the folder containing the ui.R and server.R files. Run the shinyApp() function to launch the app.

library(shiny)

# Run the app
shiny::runApp("path/to/folder")

Once launched, the app will display a title and a map with a legend. The user can select a vessel type and a vessel name to display the most recent sailed distance on the map.

The user interface is composed of the following components:

The title displays the name of the app.

The map displays the location of the ship and the distance it has sailed between two consecutive observations.

The user controls consist of two dropdown menus:

• Vessel Type: allows the user to select the type of vessel to display.
• Vessel Name: allows the user to select the name of the vessel to display.

The app is built using Shiny and leaflet. The ships.rds dataset is imported into the app and used to display the most recent sailed distance between two consecutive observations of a ship.

The app uses the geosphere package to calculate the distance between two consecutive locations. The dplyr and magrittr packages are used to manipulate and filter the dataset to obtain the most recent observation with the longest sailed distance.

This app was developed by Hamza. The app uses the following packages:

• shiny: provides the framework for the app.
• shinyWidgets: provides the dropdown menus for user selection.
• shiny.semantic: provides the grid template for the layout.
• htmltools: provides the HTML formatting for the app.
• leaflet: provides the mapping functionality.
• dplyr: provides the data manipulation functionality.
• magrittr: provides the pipe operator functionality.
• geosphere: provides the distance calculation functionality.