3D Modeling of Buildings. Outstanding Sites - download pdf or read online

By Raphaële Héno

ISBN-10: 1118648900

ISBN-13: 9781118648902

Conventional topographic databases, acquired through trap on aerial or spatial pictures supply a simplified 3D modeling of our city surroundings, answering the wishes of diverse functions (development, possibility prevention, mobility administration, etc.). even if, once we need to symbolize and study extra complicated websites (monuments, civil engineering works, archeological websites, etc.), those types not suffice and different acquisition and processing potential need to be carried out. This booklet makes a speciality of the learn of tailored lifting capability for "notable buildings". The equipment tackled during this booklet conceal lasergrammetry and the present innovations of dense correlation in line with photographs utilizing traditional photogrammetry.

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Other delivered models can be produced by extrapolating existing plans [REM 09]. Indeed, surveyors are very skilled at quickly digitizing a building with a theodolite, but this process inevitably involves a significant simplification of forms, determined by individual interpretations and choices. A survey with a laser scanner automates this process to some extent, since the equipment takes a systematic scan of the area according to a preset angular interval, which may be very precise, while the theodolite is only able to target isolated points.

17). 4) [PIE 12]. 18 show an example of such an image survey. – Avoid empty space (sky and untextured areas), shiny surfaces and repetitive patterns Given that untextured areas are not particularly conducive to automatic processing, on reasonably large areas it is possible to project texture that will help us to achieve the automatic orientation of the images, and sometimes even the 3D restitution. 17. 18. 4. 1. 1). In this case, a cable release can be used to avoid moving the camera during the opening of the shutter.

In this case, optical laws dictate that any light ray passing through the center of the lens does not deviate. 6. 2. Spatial resolution of images The dimensional sizes are: – distance from the object, marked H; – focal distance of the camera, marked f (distance from the optical center O of the lens to the surface where light rays from the infinite converge and imprint a sharp image on the back of the camera chamber); – the dimensions of the image plane (where the sensitive surface is placed, film or charge-coupled device (CCD) or complementary metal oxide semiconductor (CMOS) sensor, which captures the image); – the size of a pixel for a digital camera, marked Tpx.

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3D Modeling of Buildings. Outstanding Sites by Raphaële Héno

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