CST Level 1 Land Surveyor Certification Practice

What method is used in photogrammetric maps for gathering data?

1. Aerial photography

2. Satellite imagery

3. Ground surveys

4. Water sampling

The correct answer is: Aerial photography

The method used in photogrammetric maps for gathering data is aerial photography. This technique involves capturing images of the ground from an aircraft or drone, which are then used to create detailed maps and three-dimensional models of the terrain. Aerial photography allows surveyors to obtain data over large areas quickly, making it invaluable for planning, land-use analysis, and environmental studies. In the context of photogrammetry, the images taken from multiple angles are processed using specialized software to extract precise measurements, elevations, and other geographic information. This method is especially effective for topographic mapping, where elevation changes are critical, and it significantly enhances the efficiency and accuracy of data collection compared to traditional ground surveys. While satellite imagery can also provide valuable data for mapping purposes, it typically lacks the resolution and precision that can be achieved with high-quality aerial photography. Ground surveys involve direct measurements on-site, which are more time-consuming and can be less comprehensive over large areas. Water sampling is unrelated to mapping and focuses on the analysis of water quality rather than geographic data gathering. Hence, aerial photography stands out as the primary method for data acquisition in the production of photogrammetric maps.