GPS coordinate system (latitude, longitude, altitude) in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a GPS coordinate with latitude 40.7128.

Drone Programming

coordinate = {'latitude': [1], 'longitude': -74.0060, 'altitude': 10}

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

A10

B74.0060

C-74.0060

D40.7128

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing latitude with longitude.

Using altitude value for latitude.

The latitude value is 40.7128, which represents the north-south position.

2fill in blank

medium

Complete the code to print the longitude from the coordinate dictionary.

Drone Programming

print(coordinate[[1]])

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

A'longitude'

B'altitude'

C'location'

D'latitude'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'latitude' instead of 'longitude'.

Forgetting quotes around the key.

Longitude is accessed by the key 'longitude' in the coordinate dictionary.

3fill in blank

hard

Fix the error in the code to correctly update the altitude to 20.

Drone Programming

coordinate[[1]] = 20

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

A'altitude'

B'height'

Calt

Daltitude

Attempts:

3 left

💡 Hint

Common Mistakes

Using key without quotes causing a NameError.

Using wrong key name.

Dictionary keys must be strings in quotes to update the value correctly.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that stores coordinates with altitude above 15.

Drone Programming

{coord['latitude']: coord[[1]] for coord in coordinates if coord[[2]] > 15}

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

A'altitude'

B'longitude'

C'latitude'

D'height'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong keys like 'longitude' or 'height'.

Mixing keys between blanks.

We filter coordinates where altitude is greater than 15 and map latitude to altitude.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping latitude to longitude for coordinates below altitude 50.

Drone Programming

{coord[[1]]: coord[[2]] for coord in coordinates if coord[[3]] < 50}

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

A'latitude'

B'longitude'

C'altitude'

D'height'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong keys in mapping or condition.

Confusing altitude with height.

The dictionary maps latitude to longitude for coordinates where altitude is less than 50.

Practice

1. What does the altitude value represent in a drone's GPS coordinate system?

easy

A. The height of the drone above sea level

B. The distance east or west from the Prime Meridian

C. The distance north or south from the Equator

D. The speed of the drone in meters per second

Solution

1. Step 1: Understand GPS coordinate components

   GPS coordinates include latitude, longitude, and altitude. Latitude and longitude locate position on Earth, altitude shows height.

2. Step 2: Identify altitude meaning

   Altitude measures how high the drone is above sea level, not horizontal position or speed.

3. Final Answer:

   The height of the drone above sea level -> Option A

4. Quick Check:

   Altitude = height above sea level [OK]

Hint: Altitude means height, not horizontal position [OK]

Common Mistakes:

• Confusing altitude with latitude or longitude
• Thinking altitude measures speed
• Mixing altitude with horizontal distance

2. Which of the following is the correct way to represent a GPS coordinate in code for a drone?

easy

A. gps = {latitude: altitude, longitude: altitude}

B. gps = [altitude, longitude, latitude]

C. gps = (latitude, longitude, altitude)

D. gps = latitude + longitude + altitude

Solution

1. Step 1: Recognize GPS coordinate format

   GPS coordinates are usually stored as a tuple or list with latitude, longitude, and altitude in order.

2. Step 2: Check each option

   gps = (latitude, longitude, altitude) uses a tuple with correct order. gps = [altitude, longitude, latitude] swaps order. gps = {latitude: altitude, longitude: altitude} uses a dictionary incorrectly. gps = latitude + longitude + altitude adds numbers incorrectly.

3. Final Answer:

   gps = (latitude, longitude, altitude) -> Option C

4. Quick Check:

   Tuple with lat, long, alt in order [OK]

Hint: Use (latitude, longitude, altitude) tuple for GPS [OK]

Common Mistakes:

• Mixing order of latitude and longitude
• Using addition instead of grouping
• Using dictionary with wrong keys

3. Given the code snippet:

gps = (34.05, -118.25, 100)
latitude, longitude, altitude = gps
print(f"Lat: {latitude}, Long: {longitude}, Alt: {altitude}m")

What will be the output?

medium

A. Lat: 100, Long: 34.05, Alt: -118.25m

B. Lat: 34.05, Long: -118.25, Alt: 100m

C. Lat: -118.25, Long: 34.05, Alt: 100m

D. SyntaxError

Solution

1. Step 1: Unpack the GPS tuple

   The tuple gps = (34.05, -118.25, 100) assigns latitude=34.05, longitude=-118.25, altitude=100.

2. Step 2: Print formatted string

   The print statement outputs the values with labels and 'm' for meters.

3. Final Answer:

   Lat: 34.05, Long: -118.25, Alt: 100m -> Option B

4. Quick Check:

   Unpack tuple correctly and print [OK]

Hint: Unpack tuple in order: latitude, longitude, altitude [OK]

Common Mistakes:

• Swapping latitude and longitude values
• Confusing altitude with latitude
• Syntax errors from wrong unpacking

4. Identify the error in this code snippet for setting a drone's GPS position:

gps = (latitude, longitude, altitude)
latitude = 40.7128
longitude = -74.0060
altitude = 50
print(gps)

medium

A. gps tuple is assigned before variables, so it holds old values

B. Latitude and longitude values are swapped

C. Altitude should be a string, not a number

D. print(gps) causes a syntax error

Solution

1. Step 1: Analyze variable assignment order

   gps is assigned before latitude, longitude, altitude variables get values, so gps holds undefined or old values.

2. Step 2: Understand variable update effect

   Changing latitude, longitude, altitude after gps assignment does not update gps tuple automatically.

3. Final Answer:

   gps tuple is assigned before variables, so it holds old values -> Option A

4. Quick Check:

   Assign variables before tuple [OK]

Hint: Assign variables before creating gps tuple [OK]

Common Mistakes:

• Assigning tuple before variables
• Swapping latitude and longitude values
• Thinking print causes error

5. You want to write a function is_above_altitude(gps, threshold) that returns True if the drone's altitude is above a given threshold. Which code correctly implements this?

hard

A. def is_above_altitude(gps, threshold):
return gps[2] < threshold

B. def is_above_altitude(gps, threshold):
return gps[0] > threshold

C. def is_above_altitude(gps, threshold):
return gps[1] > threshold

D. def is_above_altitude(gps, threshold):
return gps[2] > threshold

Solution

1. Step 1: Identify altitude index in GPS tuple

   GPS tuple is (latitude, longitude, altitude), so altitude is at index 2.

2. Step 2: Compare altitude with threshold

   Return True if gps[2] (altitude) is greater than threshold.

3. Final Answer:

   def is_above_altitude(gps, threshold): return gps[2] > threshold -> Option D

4. Quick Check:

   Check altitude at index 2 > threshold [OK]

Hint: Altitude is gps[2], compare with threshold [OK]

Common Mistakes:

• Using wrong index for altitude
• Using less than instead of greater than
• Confusing latitude or longitude with altitude