ortorektifikáción

Ortorektifikace is a Czech term referring to the process of orthorectification, a photogrammetric technique used to correct geometric distortions in aerial or satellite imagery. These distortions arise from various factors, including the tilt of the camera, the curvature of the Earth, and topographic relief. Ortorektifikace aims to create a geometrically accurate, planimetrically correct image that is equivalent to a map.

The process typically involves using a digital elevation model (DEM) of the terrain and the camera's interior and exterior orientation parameters. The DEM provides the elevation information for each point in the image, allowing for the removal of displacement caused by varying terrain heights. The orientation parameters define the position and attitude of the camera at the moment the image was captured. By combining these datasets, algorithms can precisely reposition each pixel in the image to its correct ground location.

The output of ortorektifikace is an orthorectified image, also known as an orthophoto. This image has a uniform scale throughout, meaning that measurements of distance and area can be accurately taken directly from it. Orthophotos are invaluable for a wide range of applications, including geographic information systems (GIS), land surveying, urban planning, environmental monitoring, and disaster management. They serve as a geometrically precise base map layer for further analysis and mapping.