Which method is NOT commonly used for secondary data capture?

Field surveys are primarily concerned with the collection of primary data. This method involves directly gathering information from the environment or a site using various instruments and techniques, often involving direct observation or measurements.

In contrast, methods like manual digitizing, heads-up digitizing, and photogrammetry are commonly utilized for secondary data capture. Manual digitizing refers to the process of converting paper maps or images into digital format by tracing over them with a digitizing tablet or software. Heads-up digitizing involves the digitization of spatial data while viewing it on a computer screen, often using imagery or maps as a backdrop for accuracy. Photogrammetry, on the other hand, involves deriving measurements and creating maps from photographs, usually aerial or satellite images.

These methods focus on taking existing data, such as scanned maps or aerial images, and converting that into a usable digital format, thus classifying them as secondary data capture techniques.