Waypoint mission creation in Drone Programming - Mini Project: Build & Apply

Waypoint Mission Creation

📖 Scenario: You are programming a drone to fly a simple mission by visiting specific GPS points called waypoints. Each waypoint has latitude, longitude, and altitude. The drone will fly from one waypoint to the next in order.This is useful for tasks like aerial photography, surveying, or delivery.

🎯 Goal: Create a waypoint mission by defining waypoints, setting a mission speed, building the mission list, and printing the mission details.

📋 What You'll Learn

Create a list of waypoints with exact GPS coordinates and altitudes

Set a mission speed variable

Build a mission list that includes each waypoint with speed

Print the mission waypoints with their details

💡 Why This Matters

🌍 Real World

Waypoint missions are used in drones for tasks like mapping, inspection, and delivery by flying precise routes.

💼 Career

Understanding waypoint mission creation is important for drone operators, developers, and engineers working in aerial robotics and automation.

1

Create the list of waypoints

Create a list called waypoints with these exact dictionaries: {'lat': 37.7749, 'lon': -122.4194, 'alt': 100}, {'lat': 37.7750, 'lon': -122.4180, 'alt': 120}, and {'lat': 37.7755, 'lon': -122.4170, 'alt': 110}.

Drone Programming

# Create the list of waypoints with exact GPS coordinates and altitudes
# Your code here

Hint

Use a list with three dictionaries. Each dictionary must have keys 'lat', 'lon', and 'alt' with the exact values.

2

Set the mission speed

Create a variable called mission_speed and set it to 5 (meters per second).

Drone Programming

waypoints = [
    {'lat': 37.7749, 'lon': -122.4194, 'alt': 100},
    {'lat': 37.7750, 'lon': -122.4180, 'alt': 120},
    {'lat': 37.7755, 'lon': -122.4170, 'alt': 110}
]
# Set the mission speed to 5 meters per second
# Your code here

Hint

Just create a variable named mission_speed and assign the number 5.

3

Build the mission list with speed

Create a list called mission that contains dictionaries for each waypoint. Each dictionary should have keys 'lat', 'lon', 'alt', and 'speed'. Use a for loop with variables point to iterate over waypoints and add mission_speed as the speed for each waypoint.

Drone Programming

waypoints = [
    {'lat': 37.7749, 'lon': -122.4194, 'alt': 100},
    {'lat': 37.7750, 'lon': -122.4180, 'alt': 120},
    {'lat': 37.7755, 'lon': -122.4170, 'alt': 110}
]
mission_speed = 5
# Build the mission list with speed for each waypoint
# Your code here

Hint

Use a for loop to go through each waypoint and add a new dictionary to mission with the same lat, lon, alt, and the speed from mission_speed.

4

Print the mission waypoints

Use a for loop with variables wp and index using enumerate(mission, 1) to print each waypoint in the format: Waypoint {index}: lat={lat}, lon={lon}, alt={alt}, speed={speed}.

Drone Programming

waypoints = [
    {'lat': 37.7749, 'lon': -122.4194, 'alt': 100},
    {'lat': 37.7750, 'lon': -122.4180, 'alt': 120},
    {'lat': 37.7755, 'lon': -122.4170, 'alt': 110}
]
mission_speed = 5
mission = []
for point in waypoints:
    mission.append({'lat': point['lat'], 'lon': point['lon'], 'alt': point['alt'], 'speed': mission_speed})
# Print each waypoint with index and details
# Your code here

Hint

Use enumerate(mission, 1) to get the index starting at 1 and print each waypoint's details with an f-string.

Practice

1. What is the main purpose of creating a waypoint mission for a drone?

easy

A. To make the drone fly automatically through specific GPS points

B. To manually control the drone with a remote

C. To charge the drone's battery faster

D. To change the drone's camera settings

Solution

1. Step 1: Understand waypoint missions

   Waypoint missions are designed to let drones fly automatically through set GPS points without manual control.

2. Step 2: Compare options

   Only To make the drone fly automatically through specific GPS points describes automatic flight through GPS points, which matches the purpose of waypoint missions.

3. Final Answer:

   To make the drone fly automatically through specific GPS points -> Option A

4. Quick Check:

   Waypoint mission = automatic GPS flight [OK]

Hint: Waypoint missions automate flight through GPS points [OK]

Common Mistakes:

• Confusing manual control with automatic missions
• Thinking waypoint missions change camera or battery
• Assuming speed control is the main purpose

2. Which of the following is the correct way to add a waypoint with latitude, longitude, and altitude in a drone mission code snippet?

easy

A. waypoint_add(100, 34.05, -118.25)

B. add_waypoint(altitude=100, lat=34.05, long=-118.25)

C. addWaypoint(34.05, -118.25)

D. add_waypoint(latitude=34.05, longitude=-118.25, altitude=100)

Solution

1. Step 1: Identify correct parameter names and order

   The standard is to specify latitude, longitude, and altitude clearly, usually with named parameters or in order.

2. Step 2: Check each option

   add_waypoint(latitude=34.05, longitude=-118.25, altitude=100) uses clear parameter names and correct order. Others have wrong names, missing altitude, or wrong order.

3. Final Answer:

   add_waypoint(latitude=34.05, longitude=-118.25, altitude=100) -> Option D

4. Quick Check:

   Correct parameter names and order = add_waypoint(latitude=34.05, longitude=-118.25, altitude=100) [OK]

Hint: Use clear latitude, longitude, altitude parameters [OK]

Common Mistakes:

• Using wrong parameter names like lat or long instead of latitude/longitude
• Omitting altitude
• Wrong function name or missing parameters

3. Given the following code snippet for a waypoint mission:

mission = []
mission.append({'lat': 40.0, 'lon': -74.0, 'alt': 50})
mission.append({'lat': 40.1, 'lon': -74.1, 'alt': 60})
speed = 10
print(len(mission), mission[1]['alt'], speed)

What will be the output?

medium

A. 2 60 10

B. 2 50 10

C. 1 60 10

D. 2 60 0

Solution

1. Step 1: Count waypoints in mission list

   Two waypoints are appended, so len(mission) is 2.

2. Step 2: Access altitude of second waypoint and speed

   mission[1]['alt'] is 60, and speed is set to 10.

3. Final Answer:

   2 60 10 -> Option A

4. Quick Check:

   Waypoints=2, altitude=60, speed=10 [OK]

Hint: Count list items and check dictionary keys carefully [OK]

Common Mistakes:

• Confusing index 0 and 1 for second waypoint
• Mixing altitude values
• Ignoring speed variable

4. Identify the error in this waypoint mission code snippet:

mission = []
mission.add({'latitude': 35.0, 'longitude': -120.0, 'altitude': 80})
speed = 15
print(len(mission))

medium

A. Incorrect variable name 'speed'

B. Using 'add' method instead of 'append' for list

C. Missing altitude value in waypoint dictionary

D. Print statement syntax error

Solution

1. Step 1: Check list method usage

   Python lists use 'append' to add items, not 'add'. Using 'add' causes an error.

2. Step 2: Verify other parts

   Altitude is present, variable names are correct, and print syntax is valid.

3. Final Answer:

   Using 'add' method instead of 'append' for list -> Option B

4. Quick Check:

   List method must be append, not add [OK]

Hint: Use append() to add items to a list [OK]

Common Mistakes:

• Using set methods like add() on lists
• Forgetting to include altitude
• Typos in variable names

5. You want to create a waypoint mission where the drone flies through three points with these coordinates and altitudes using dictionary keys 'latitude', 'longitude', 'altitude': 1) (34.0, -117.0, 100m) 2) (34.1, -117.1, 120m) 3) (34.2, -117.2, 110m) You also want the drone to fly at 8 m/s between points. Which code snippet correctly creates this mission and sets the speed?

hard

A. mission = [{'lat':34.0, 'lon':-117.0, 'alt':100}, {'lat':34.1, 'lon':-117.1, 'alt':120}, {'lat':34.2, 'lon':-117.2, 'alt':110}]
speed = 8

B. mission = []
mission.add({'lat':34.0, 'lon':-117.0, 'alt':100})
mission.add({'lat':34.1, 'lon':-117.1, 'alt':120})
mission.add({'lat':34.2, 'lon':-117.2, 'alt':110})
speed = 8

C. mission = []
mission.append({'latitude':34.0, 'longitude':-117.0, 'altitude':100})
mission.append({'latitude':34.1, 'longitude':-117.1, 'altitude':120})
mission.append({'latitude':34.2, 'longitude':-117.2, 'altitude':110})
speed = 8

D. mission = [{'lat':34.0, 'lon':-117.0}, {'lat':34.1, 'lon':-117.1}, {'lat':34.2, 'lon':-117.2}]
speed = 8

Solution

1. Step 1: Check waypoint creation with correct keys

   mission = [] mission.append({'latitude':34.0, 'longitude':-117.0, 'altitude':100}) mission.append({'latitude':34.1, 'longitude':-117.1, 'altitude':120}) mission.append({'latitude':34.2, 'longitude':-117.2, 'altitude':110}) speed = 8 uses 'latitude', 'longitude', and 'altitude' keys consistently, matching the given data.

2. Step 2: Verify method to add waypoints and speed setting

   mission = [] mission.append({'latitude':34.0, 'longitude':-117.0, 'altitude':100}) mission.append({'latitude':34.1, 'longitude':-117.1, 'altitude':120}) mission.append({'latitude':34.2, 'longitude':-117.2, 'altitude':110}) speed = 8 uses append() correctly to add waypoints and sets speed to 8 m/s as required.

3. Step 3: Eliminate incorrect options

   mission = [{'lat':34.0, 'lon':-117.0, 'alt':100}, {'lat':34.1, 'lon':-117.1, 'alt':120}, {'lat':34.2, 'lon':-117.2, 'alt':110}] speed = 8 uses different keys ('lat', 'lon', 'alt') which are inconsistent with required keys. mission = [] mission.add({'lat':34.0, 'lon':-117.0, 'alt':100}) mission.add({'lat':34.1, 'lon':-117.1, 'alt':120}) mission.add({'lat':34.2, 'lon':-117.2, 'alt':110}) speed = 8 uses 'add' which is invalid for lists. mission = [{'lat':34.0, 'lon':-117.0}, {'lat':34.1, 'lon':-117.1}, {'lat':34.2, 'lon':-117.2}] speed = 8 misses altitude values.

4. Final Answer:

   mission = [] mission.append({'latitude':34.0, 'longitude':-117.0, 'altitude':100}) mission.append({'latitude':34.1, 'longitude':-117.1, 'altitude':120}) mission.append({'latitude':34.2, 'longitude':-117.2, 'altitude':110}) speed = 8 -> Option C

5. Quick Check:

   Correct keys + append() + speed = mission = [] mission.append({'latitude':34.0, 'longitude':-117.0, 'altitude':100}) mission.append({'latitude':34.1, 'longitude':-117.1, 'altitude':120}) mission.append({'latitude':34.2, 'longitude':-117.2, 'altitude':110}) speed = 8 [OK]

Hint: Use append() with full keys and set speed separately [OK]

Common Mistakes:

• Using add() instead of append()
• Missing altitude in waypoints
• Mixing key names inconsistently