Fuzzy optimization for a vehicle routing problem with drones in rural last-mile delivery

The following instances are originally presented in the paper Fuzzy optimization for a vehicle routing problem with drones in rural last-mile delivery.The data includes 84 instances corresponding to different scales and scenarios, as well as a realistic case. Each instance is named "n. d. m. h", where n is the number of customers, d represents the dimension of the grid, m is the generic name of the scenarios with different coordinates and demands, and h refers to the generic name of the altitude scenarios.The first column of each instance file indicates Coordinate X of each customer. The second and third columns are Coordinate Y and Demand, respectively. The last column is Altitude.