Aerial Triangulation (AT) is an essential part of any successful photogrammetry project. Acuvec offers complete softcopy aerial triangulation services, providing highly accurate control for the map production. Digital images are uploaded into softcopy workstations. The airborne GPS coordinates and the ground survey control points are used to control the triangulation solution.
The Digital Terrain Model (DTM) plays an important part in the production of geo-referenced orthophotographs. Acuvec conforms to the proper usage of hard and soft breaklines in all its DTM editing assignments. This produces a very good terrain representation resulting in superior quality orthophotos.
A sufficient amount of height information is gathered from the photogrammetric restitution of spot heights and breaklines in aerial photos (vector data) or from laser scanner mapping to acurately generate the Digital Terrain Model (DTM).
An orthophotograph is a an aerial colour photograph geometrically and geographically corrected to be superimposed on a plan. The production of orthophotographs consists of correcting the distortions of the exposures caused by ground surface relief. This is possible because of the parameters generated by aerial triangulation, the DTM. and the ground control points. These rectified images preserve all the detail of the aerial photo and form the basis for a complete Geographical Information System (GIS).
Products:
- Boundaries
- Designated areas
- Buildings
- Geodetic points
- Transportation
- Hydrographic features
- Utilities
- Elevation
- Vegetation
- Spatial database schema
- Data dictionary and product catalogue
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