ArUco marker landing in Drone Programming - Mini Project: Build & Apply

ArUco Marker Landing

📖 Scenario: You are programming a drone to land precisely on a special ArUco marker placed on the ground. The drone's camera detects markers and provides their IDs and positions. Your task is to write code that helps the drone identify the correct marker and calculate the landing position.

🎯 Goal: Build a program that stores detected ArUco markers with their positions, selects the landing marker by its ID, and outputs the exact coordinates where the drone should land.

📋 What You'll Learn

Create a dictionary with ArUco marker IDs as keys and their (x, y) positions as values.

Add a variable to store the target landing marker ID.

Use a dictionary comprehension to find the position of the target marker.

Print the landing coordinates for the drone.

💡 Why This Matters

🌍 Real World

Drones use ArUco markers to find exact landing spots in delivery, inspection, and rescue missions.

💼 Career

Understanding how to process marker data and control drone landing is important for robotics and drone programming jobs.

1

Create the ArUco markers dictionary

Create a dictionary called markers with these exact entries: 101: (5.0, 3.2), 102: (2.5, 7.8), 103: (9.1, 1.4), 104: (4.0, 4.0)

Drone Programming

# Create the markers dictionary with IDs and positions
# Your code here

Need a hint?

Use curly braces {} to create a dictionary with keys as marker IDs and values as tuples for positions.

2

Set the target landing marker ID

Create a variable called target_id and set it to 103 to represent the marker where the drone should land.

Drone Programming

markers = {101: (5.0, 3.2), 102: (2.5, 7.8), 103: (9.1, 1.4), 104: (4.0, 4.0)}
# Set the target marker ID for landing
# Your code here

Need a hint?

Just assign the number 103 to the variable target_id.

3

Find the landing position using dictionary comprehension

Use a dictionary comprehension to create a dictionary called landing_position that contains only the entry from markers where the key equals target_id.

Drone Programming

markers = {101: (5.0, 3.2), 102: (2.5, 7.8), 103: (9.1, 1.4), 104: (4.0, 4.0)}
target_id = 103
# Use dictionary comprehension to get landing_position
# Your code here

Need a hint?

Use {k: v for k, v in markers.items() if k == target_id} to filter the dictionary.

4

Print the landing coordinates

Print the landing coordinates by accessing the position tuple from landing_position using target_id. Use print(f"Landing coordinates: {landing_position[target_id]}").

Drone Programming

markers = {101: (5.0, 3.2), 102: (2.5, 7.8), 103: (9.1, 1.4), 104: (4.0, 4.0)}
target_id = 103
landing_position = {k: v for k, v in markers.items() if k == target_id}
# Print the landing coordinates
# Your code here

Need a hint?

Use an f-string to print the coordinates in the format shown.