By Raphaële Héno
Conventional topographic databases, received through trap on aerial or spatial photographs offer a simplified 3D modeling of our city surroundings, answering the desires of diverse functions (development, possibility prevention, mobility administration, etc.). notwithstanding, after we need to signify and examine extra complicated websites (monuments, civil engineering works, archeological websites, etc.), those types now not suffice and different acquisition and processing capacity must be applied. This publication makes a speciality of the learn of tailored lifting capability for "notable buildings". The tools tackled during this e-book conceal lasergrammetry and the present ideas of dense correlation in response to photographs utilizing traditional photogrammetry.
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Additional info for 3D Modeling of Buildings. Outstanding Sites
Rules established for traditional production (block orientation – aerotriangulation – of standard images) mean that it is necessary to have a known point in three dimensions in each corner of the image block, as well as one point per stereoscopic pair. Absolute accuracy of the orientation is directly dependent on the control points used: measurements taken from targets will give better final accuracy than those taken from poorly defined natural points.
Stereoscopic image surveying for the automatic production of 3D point clouds Most of the image surveying carried out nowadays is much more redundant than traditional image surveying. Indeed, the constraint has changed from requiring all points of the area of interest to be visible on at least two photos in normal configuration (for the requirements of manual stereoplotting by an operator), to requiring all points of the area of interest to be visible in at least three photos (for the reliability requirements of automatic restitution algorithms) [PIE 11].
However, this equipment reduced the image surveying specifications, since the implemented model enabled more data processing. 3. Examples of photogrammetric stereoplotting equipment. 2. Modernization of equipment It was not until the 1990s that the first digital photogrammetric equipment further pushed back the limits of photogrammetric surveying. Digital photographic equipment quickly won over photogrammetrists who saw the possibility of using these high-quality images to add automatic measurement algorithms into their production processes, which had already proved successful for scanned analog photographs [MAÎ 92].