A fixed fleet based at the piers: UAVs stay where they land, recharge on the pad apron, and are repositioned empty when a pier runs out.
System ready
B 110 mA 90 mE 60 mpiercorridor heights· right-drag / ctrl-drag to tilt and rotate · needs internet for imagery and buildings
Map
Ferry pier = UAV pad (7)
Helipad — manned helicopters, reference only
Pier with a helipad on the same building
Access / holding fix (AC-…)
Cross-harbour link (along a ferry route)
Coastal link
Restricted flying zone (Cap 448G) — reference only
HKO anemometer / leg wind
Flight layers
B · 110 m · track 180–359°
A · 90 m · track 000–179°
E · 60 m · emergency only
UAV phase (label tag)
waiton pierclimbclimbingAcruise 90 mBcruise 110 mapprfinal approachholdholding at fixlandlandingunloadunloadingEMGemergency / layer E
Fleet model
fixed fleet based at the 7 piers · same corridor, wind, 4D booking and energy model as the twin
Fleet
Demand
Rebalancing
Fixed assumptions: battery 950 Wh (same pack as the twin) · pad charging 1.5 kW (≈ 38 min to full) · 120 min run
Advanced
Rules: an order waits at its origin pier until a UAV there has enough charge for the trip plus the 20 % reserve; it then books a conflict-free 4D slot as in the live twin. After landing and 30 s unloading the UAV stays at the destination and charges. None – UAVs only move with an order. Reactive – when a pier has waiting orders and no UAV is on the way, the nearest pier with a spare UAV sends one empty. Proactive – every pier keeps a target number of ready UAVs (enough charge for its longest trip + reserve): a pier below target is topped up from the nearest pier above target before orders pile up, and a UAV left surplus at a pier flies back to its home pier if home is short.
Set the fleet and demand on the left, then run the model.
Guide & definitions
What this module is: the reference module of the digital twin. It holds every definition, threshold and parameter
used in the interface, so the main screen only carries controls and live values. How to use it: pick a topic on the left. On the main screen, hover over any button or any field of the bottom status bars
for a one-line definition, and click a status bar to open a card that explains the current numbers. Close this window with × or Esc.