What does photogrammetry involve?

Photogrammetry involves taking measurements from aerial photographs, making it a critical tool in surveying and mapping. This technique utilizes photographs captured from above, usually from aircraft or drones, to gather information about the terrain and features on the surface of the Earth. By analyzing the photographs and employing various mathematical processes, surveyors can derive precise measurements and create topographical maps.

This method allows for the capture of large areas efficiently, providing a visual representation that can be transformed into accurate measurements. The accuracy of photogrammetry comes from the ability to establish a scale and perspective based on the angles and distances visible in the photographs. This is essential for tasks that require detailed spatial analysis, such as land use planning, environmental monitoring, and construction project assessments.

While measuring distances with a rod, calculating grade changes, and creating 3D models are all relevant activities in surveying, they do not specifically define what photogrammetry entails. Photogrammetry distinctly emphasizes the measurement processes derived from images, making it an invaluable aspect of modern surveying practices.