Modern Geospatial products from Oblique Imagery.
The use of oblique aerial imagery for metric purposes is, nowadays, one of the most promising application that not only complements the classic photogrammetric documentation, but also an autonomous methodology designed to produce modern mapping products. The perspective view of the real world is easier and friendlier. This characteristic of oblique images makes them an integral part of every topographical, urban planning and architectural survey, from the documentation to the urban planning and decision making. Moreover, it saves processing time and reduces significantly the need for field inspections.
Some very important characteristics of oblique imagery, which cannot be achieved by vertical aerial images and orthophotos are easier and faster feature recognition and highly accurate measurements. This way we can achieve more accurate positioning and detail measurements (boundaries of properties, fences, residencies, public spaces, open spaces, roads, pavements). These features are necessary for the creation and update of vector maps for urban areas.
Oblique imagery enhances the geometry of the photogrammetric block, when combined with vertical images, ensuring high-accuracy deliverables such as DSMs, true orthophotos and imaging products of large cities.
Map, thanks to its well-trained scientists and engineers, is a pioneer in the field of 3D City Models creation including the use of oblique imagery in the basic production process, offering the following options:
a. single oblique image orientation (direct linear transformation – DLT) or bundle adjustment self-calibration
b. stereoscopic digitizing from oblique overlapped images
c. 3D city models with texture from oblique images