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During the summer of 2005, COWI carried out oblique digital aerial photography of the city of Gothenburg. The oblique images, covering an area of 330 km², are being used by the local authorities for various planning purposes.
In September 2005, COWI delivered some 38,000 digital oblique images of the city of Gothenburg. The oblique images were produced at a high resolution (6 cm), making them very detailed and ideal for visual documentation.
Digital oblique imagery is a powerful, visual tool with various applications. In Gothenburg, the local authorities use oblique photos for, among other things, city planning purposes, school administration, traffic planning, and building maintenance.The very high resolution of the imagery gives an unprecedented view of building facades and structures along with information on colour, types of windows, siding, tiling, and other details. This makes them very useful, for example, when processing building permits.
Compared with the traditional orthophotography, which presents a top view of the geography, the advantage of oblique photography is that it shows building information visible from street level, such as entrances or the number of storeys. Combining orthophotography and oblique photography gives a rich visual representation of the situation on the ground. The detail available with oblique photos is achieved by photographing every point on the ground from four directions.
A crucial issue for the client was to get a flexible and transparent data-set. This was achieved by using standard formats and techniques, and the data-set was integrated into a MapInfo Geographic Information System (GIS) environment with navigational tools provided by COWI, and also into Gothenburg's Internet-based Map/GIS server. All 38,000 images are geo-referenced using a GPS/INS solution providing easy navigation through the vast image data.
The oblique imagery will be used by the local authorities in connection with documentation and changes in the city and for swift and correct handling of building permits.
COWI's assignmentAerial photography of Gothenburg.
Production and delivery of high resolution oblique photos.