Surveying and mapping with photogrammetry in Drone Programming - Step-by-Step Execution

Concept Flow - Surveying and mapping with photogrammetry

Plan flight path

↓

Drone flies and takes photos

↓

Collect images

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Upload images to software

↓

Software processes images

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Generate 3D map and measurements

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Review and export results

The drone flies a planned path taking photos, which are processed to create maps and measurements.

Execution Sample

Drone Programming

def photogrammetry_survey(area):
    flight_path = plan_path(area)
    images = drone_capture(flight_path)
    map_3d = process_images(images)
    return map_3d

This code plans a flight, captures images with a drone, processes them, and returns a 3D map.

Execution Table

Step	Action	Input	Output	Notes
1	Plan flight path	area coordinates	flight_path coordinates	Defines where drone will fly
2	Drone flies and captures photos	flight_path	images set	Photos taken at intervals
3	Upload images to software	images set	images ready for processing	Prepare images for mapping
4	Process images	images ready	3D map data	Software matches points and builds map
5	Return 3D map	3D map data	3D map output	Final map ready for use

💡 All steps complete, 3D map generated from drone images

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
area	given	given	given	given	given	given
flight_path	none	coordinates	coordinates	coordinates	coordinates	coordinates
images	none	none	photos set	photos set	photos set	photos set
map_3d	none	none	none	none	3D map data	3D map output

Key Moments - 3 Insights

Why do we need to plan the flight path before flying?

Planning the flight path (Step 1) ensures the drone covers the entire survey area systematically, which is shown in the execution_table row 1.

What happens if images are not uploaded correctly to the software?

If images are not uploaded (Step 3), the software cannot process them to create the 3D map, so the process stops before Step 4 as shown in the execution_table.

Why does the drone take many photos instead of just one?

Multiple photos from different angles help the software match points and build an accurate 3D map, as explained in Step 4 of the execution_table.

Visual Quiz - 3 Questions

Look at the execution table, what is the output after Step 2?

A flight_path coordinates

B images set

C 3D map data

D photos ready for processing

💡 Hint

Check the 'Output' column for Step 2 in the execution_table.

At which step does the software create the 3D map?

A Step 4

B Step 3

C Step 1

D Step 5

💡 Hint

Look at the 'Action' and 'Output' columns in the execution_table for where '3D map data' is produced.

If the flight path is not planned correctly, which variable will be affected first?

A images

B map_3d

C flight_path

D area

💡 Hint

Refer to variable_tracker to see which variable changes after Step 1.

Concept Snapshot

Surveying with photogrammetry:
1. Plan drone flight path over area.
2. Drone captures overlapping photos.
3. Upload images to processing software.
4. Software builds 3D map from images.
5. Export and use map for measurements.

Full Transcript

Surveying and mapping with photogrammetry involves planning a drone flight path over the survey area. The drone flies this path and takes many photos from different angles. These images are uploaded to special software that processes them by matching points in overlapping photos. This process creates a detailed 3D map of the area. The final map can be reviewed and exported for use in measurements and analysis. Each step changes variables like flight_path, images, and map_3d as shown in the execution table and variable tracker.