All photographs have distortions in them. Orthorectification is the process of removing the effects of image distortion induced by the sensor (camera), viewing perspective, and relief (ground surface) to create an image that is planimetrically correct. The resulting orthorectified photograph, or orthophoto has a constant scale meaning that features are represented in their true positions in relation to their ground position.
An orthomosaic is a detailed, accurate photo representation of an area, created out of many photos that have been stitched together and orthorectified.
At Landair Surveys we create orthophotos for small sites such as development sites, quarries, mines, landfills as well as entire towns and water catchment areas.
We can also overlay other data onto orthophotos such as contours, geographic information, traffic management information, underground and overhead services and title boundaries.
An orthophoto (orthorectified photograph, orthophotograph or orthoimage) is an aerial image that can be treated like a map which means that coordinates, areas, distances and angles may be measured directly from the orthophoto.
Orthophotos are commonly used as background layers in CAD packages and in Geographic Information Systems (GIS) as a “map accurate” background image.