Valokuvamenetelmän

Valokuvamenetelmän refers to photogrammetry, a science of making measurements from photographs. It involves taking overlapping photographs of an object or scene from various vantage points. These photographs are then processed using specialized software to create a three-dimensional model. The software identifies common points in the overlapping areas of the images and uses principles of triangulation to determine the spatial coordinates of these points. By triangulating numerous points, a dense point cloud representing the object's surface is generated. This point cloud can then be converted into a mesh, which is a surface composed of polygons, and subsequently textured using the original photographs to create a photorealistic 3D model.

The accuracy of a photogrammetric model depends on several factors, including the quality and resolution of the photographs, the degree of overlap between images, the calibration of the camera, and the techniques used in the processing. Applications of photogrammetry are widespread and include surveying and mapping, architecture and construction for creating as-built models and monitoring progress, cultural heritage preservation for documenting historical sites and artifacts, industrial inspection for quality control and defect detection, and entertainment industries for creating virtual environments and special effects. Advancements in drone technology and computational power have made photogrammetry more accessible and efficient, enabling rapid data acquisition and processing for a wide range of projects.