Orthorectification

Orthorectification is a highly sophisticated technique in the field of image processing of geospatial images that is used to remove distortions in the images collected using aircraft, drones, and satellites due to variations in terrain elevation, orientation of the sensor, perspective of the camera, and curvature of the Earth’s surface. This is done by making use of ground control data, parameters of the sensors, and DEMs to create geometrically accurate images. Such orthorectified images can be accurately overlaid with maps, GIS layers, property lines, road maps, and any other kind of geographic data. Orthorectification finds wide applications in remote sensing, surveying with drones, photogrammetry, precision farming, infrastructure mapping, and environmental surveillance.