GPS data processing in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to extract the latitude from the GPS data dictionary.

Drone Programming

latitude = gps_data[1]

Drag options to blanks, or click blank then click option'

A['latitude']

B[latitude]

C.latitude

Dlatitude

Attempts:

3 left

💡 Hint

Common Mistakes

Using dot notation instead of square brackets for dictionary access.

Forgetting to put the key name in quotes.

The GPS data is stored as a dictionary. To get the latitude value, use the key 'latitude' inside square brackets.

2fill in blank

medium

Complete the code to calculate the distance between two GPS points using the Haversine formula.

Drone Programming

distance = 2 * radius * math[1](math.sqrt(a))

Drag options to blanks, or click blank then click option'

A.tan

B.sin

C.cos

D.asin

Attempts:

3 left

💡 Hint

Common Mistakes

Using sine instead of arcsine.

Using cosine or tangent which are incorrect here.

The Haversine formula uses the arcsine function, which is math.asin in Python, to calculate the central angle.

3fill in blank

hard

Fix the error in the code to convert GPS coordinates from degrees to radians.

Drone Programming

lat_rad = math[1](lat_deg)

Drag options to blanks, or click blank then click option'

A.degrees

B.radians

C.to_radians

D.convert

Attempts:

3 left

💡 Hint

Common Mistakes

Using math.degrees() which converts radians to degrees.

Using non-existent functions like to_radians or convert.

To convert degrees to radians, use math.radians(). The other options are invalid functions.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each GPS point's ID to its altitude if altitude is above 100 meters.

Drone Programming

altitudes = {point[1]: data[2] for point, data in gps_points.items() if data['altitude'] > 100}

Drag options to blanks, or click blank then click option'

A['id']

B['altitude']

C.id

D.altitude

Attempts:

3 left

💡 Hint

Common Mistakes

Using dot notation which does not work for dictionaries.

Mixing up keys and values in the comprehension.

Use ['id'] to get the point's ID and ['altitude'] to get the altitude from the data dictionary.

5fill in blank

hard

Fill both blanks to filter GPS points with latitude greater than 40, and create a dictionary with uppercase IDs as keys and their longitude as values.

Drone Programming

filtered = {point[1]: data[2] for point, data in gps_data.items() if data['latitude'] > 40}

Drag options to blanks, or click blank then click option'

A{

B.upper()

C['longitude']

D['id']

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the opening curly brace for the dictionary.

Not converting the point ID to uppercase.

Using wrong key names or dot notation.

Start the dictionary with {, use point.upper() to uppercase the ID, and access longitude with data['longitude'].

Practice

1. What is the main purpose of processing GPS data in drone programming?

easy

A. To convert raw GPS signals into usable location information

B. To increase the drone's battery life

C. To improve the drone's camera resolution

D. To control the drone's speed manually

Solution

1. Step 1: Understand GPS data role

   GPS data provides raw signals that need to be processed to get location info.

2. Step 2: Identify main purpose in drone programming

   Processing GPS data helps the drone know where it is to navigate safely.

3. Final Answer:

   To convert raw GPS signals into usable location information -> Option A

4. Quick Check:

   GPS data processing = usable location info [OK]

Hint: GPS data processing means turning signals into location [OK]

Common Mistakes:

• Confusing GPS data processing with battery or camera functions
• Thinking GPS controls speed directly
• Assuming GPS data is already usable without processing

2. Which of the following is the correct syntax to extract latitude from a GPS data dictionary named gps_data in Python?

easy

A. latitude = gps_data.latitude

B. latitude = gps_data['latitude']

C. latitude = gps_data(latitude)

D. latitude = gps_data->latitude

Solution

1. Step 1: Recall Python dictionary access syntax

   Python dictionaries use square brackets and keys as strings to access values.

2. Step 2: Match syntax to gps_data dictionary

   Correct way is gps_data['latitude'], not dot or parentheses or arrow.

3. Final Answer:

   latitude = gps_data['latitude'] -> Option B

4. Quick Check:

   Dictionary key access = gps_data['key'] [OK]

Hint: Use square brackets with key string for dictionary access [OK]

Common Mistakes:

• Using dot notation for dictionary keys
• Using parentheses instead of brackets
• Using arrow notation which is not Python syntax

3. What will be the output of this Python code snippet processing GPS coordinates?

gps_points = [{'lat': 40.7128, 'lon': -74.0060}, {'lat': 34.0522, 'lon': -118.2437}]
latitudes = [point['lat'] for point in gps_points]
print(latitudes)

medium

A. [40.7128, 34.0522]

B. ['lat', 'lat']

C. [{'lat': 40.7128}, {'lat': 34.0522}]

D. [40.7128, -74.0060, 34.0522, -118.2437]

Solution

1. Step 1: Understand list comprehension extracting 'lat'

   The code loops over gps_points and picks the 'lat' value from each dictionary.

2. Step 2: Evaluate the resulting list

   It creates a list of latitudes: [40.7128, 34.0522].

3. Final Answer:

   [40.7128, 34.0522] -> Option A

4. Quick Check:

   List comprehension extracts latitudes = [40.7128, 34.0522] [OK]

Hint: List comprehension extracts values by key from each dict [OK]

Common Mistakes:

• Confusing keys with values
• Expecting full dictionaries instead of values
• Mixing latitude and longitude in one list

4. Identify the error in this Python code that processes GPS data:

gps_data = {'lat': 51.5074, 'lon': -0.1278}
print(gps_data.lat)

medium

A. The print statement syntax is incorrect

B. The dictionary keys are misspelled

C. The dictionary is missing required keys

D. Using dot notation to access dictionary keys causes an AttributeError

Solution

1. Step 1: Check dictionary access method

   Python dictionaries do not support dot notation; keys must be accessed with brackets.

2. Step 2: Identify the error type

   Using gps_data.lat will cause an AttributeError because 'dict' object has no attribute 'lat'.

3. Final Answer:

   Using dot notation to access dictionary keys causes an AttributeError -> Option D

4. Quick Check:

   Dictionary keys need brackets, not dot notation [OK]

Hint: Use brackets, not dot, to access dictionary keys [OK]

Common Mistakes:

• Trying to access dict keys with dot notation
• Assuming print syntax is wrong
• Thinking dictionary keys are missing

5. You have a list of GPS data points with possible missing longitude values represented as None:

gps_points = [
  {'lat': 35.6895, 'lon': 139.6917},
  {'lat': 48.8566, 'lon': None},
  {'lat': 55.7558, 'lon': 37.6173}
]

Which Python code correctly creates a new list of only points with valid longitude values?

hard

A. valid_points = [p for p in gps_points if p['lon'] != 0]

B. valid_points = [p for p in gps_points if p['lat'] > 0]

C. valid_points = [p for p in gps_points if p['lon'] is not None]

D. valid_points = [p for p in gps_points if p['lon']]

Solution

1. Step 1: Understand filtering condition for valid longitude

   Longitude is valid if it is not None; zero is a valid longitude value.

2. Step 2: Check each option's condition

   valid_points = [p for p in gps_points if p['lon'] is not None] correctly filters points where 'lon' is not None. valid_points = [p for p in gps_points if p['lon'] != 0] wrongly excludes zero longitude. valid_points = [p for p in gps_points if p['lat'] > 0] filters by latitude, not longitude. valid_points = [p for p in gps_points if p['lon']] excludes zero longitude because zero is falsy.

3. Final Answer:

   valid_points = [p for p in gps_points if p['lon'] is not None] -> Option C

4. Quick Check:

   Filter with 'is not None' to keep valid longitude [OK]

Hint: Use 'is not None' to filter out missing GPS values [OK]

Common Mistakes:

• Filtering out zero longitude by mistake
• Filtering by latitude instead of longitude
• Using truthy check that excludes zero