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Home Services Topography Topographic with Laser scanners

The laser scanner (also known as 3D laser) is a tool that allows the detection of three-dimensional models of objects at different scales and resolutions.

The high amount of data acquired in a short time you run the important geometric objects with a remarkable level of detail and completeness. The result of a scanning is a set of very numerous points (called a "cloud of points") distributed on the object to be detected, depending on the degree of detail that is to be achieved. Each point is defined by its spatial position in the xyz coordinates with respect to the origin point represented by the position of the instrument and if the instrument is able to detect also the mapping photographic object also through its chromaticity coordinates. In addition, the laser signal hits the surface to be detected and based on the measure of the real value of reflectance of materials (physical characteristic that distinguishes the state of the material and type) makes a classification of different construction materials.

The aim is to create a three dimensional digital model as close as possible to the reality of the object scanned.

The phases of
relief are distinguished:

  1. phase of data acquisition (scan);
  2. phase of processing of the data;
  3. phase extraction of data.




Acquisition of data

The scanner once mounted on a tripod with a spirit level, is connected to the batteries and programmed with an external computer. The parameters to set are:

  1. the resolution, which helps to determine how many points you capture in a scan;
  2. the scanning speed, which depends on the resolution in a manner inversely proportional;
  3. accuracy, which depends on the resolution in a proportional way: the greater the number of points acquired better is the detail of the scan.

The parameters are set, the scanner begins to emit a laser beam that strikes the object producing a cloud of points relative to the surfaces hit by the beam. At the end of each scan, which lasts from 15 to 20 minutes, depending on the resolution set, the data is recorded or the internal PC that comes with the scanner or on a memory card.

Processing of data

The scans are imported into the modeling software and subjected to filtering operations to eliminate spurious signals that automatically provide 3D ​​coordinates incorrect.

The scans are displayed as black and white photographs on which at least 3 points are chosen counterparts, easily recognizable, under which is the superposition of point clouds.

At this stage scans are merged in an automatic way by the program according to the input supplied in pre-registration phase.

The editing tools allow you to manage thousands of points arising from the digitization process, simplifying and reducing the number of geometries under construction. The cloud point is transformed into spline surfaces and meshes.

During the calibration phase of the images are chosen at least 13 homologous points on the image to "map" and the cloud of points to be colored.

The photograph is projected on the cloud of points giving the RGB information.

Data Extraction

Following the processing of data is possible:

  • measured;
  • produce movies;
  • obtain images corrected;
  • export sections obtained in DXF format;
  • place the object detected according to a topographical;
  • creating a model exportable to CAD (difficult to manage).

The GEOSIS Ltd. through its latest generation laser scanner is able to generate maps for numerous applications such as 2D drawings for pipelines, technical surveys, relief of facades of buildings and any project in which requests are accurate 2D maps of the "built" and the "as is" can also be generated cross sections but also extensive 3D modeling of the 'area scanned.

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