What type of sensors are used in photogrammetry?

Photogrammetry relies on a variety of sensors to capture images and data for the purpose of creating accurate measurements and models of the physical world. The correct answer identifies both passive and active sensors, which play distinct roles in this field.

Passive sensors detect natural energy that is reflected or emitted from the objects being imaged. In the context of photogrammetry, this typically involves capturing visible light data through cameras to create photorealistic images of terrain and features.

Active sensors, on the other hand, emit their own energy source, such as radar or laser, to capture information. This can enhance the capabilities of photogrammetry by providing additional data points that can be critical for understanding elevation changes, surface roughness, and other specifics that are often challenging to perceive with passive sensors alone.

Combining information from both types of sensors allows for a more comprehensive analysis, resulting in highly accurate three-dimensional models and measurements. This synergy is vital in applications ranging from mapping and surveying to agriculture and forestry.

The other options don't encompass the full range of benefits provided by the combination of both passive and active sensors. Digital sensors refer generally to how data is recorded but don't specify their operational mode (passive or active). Manual sensors don't typically apply in photogrammetry