Scanner on location

The use of long distance laser scanners means the spatial and photographic data surrounding the immediate target area is captured and hence additional data sets of these buildings can be built as and when required.

Where applicable a mobile laser scanning system can be employed. Although not as accurate as terrestrial scanning, the mobile unit enables rapid capture of the spatial data using a land-based Lidar system.

Models accurate to millimetres are produced through the use of our terrestrial system. In addition to providing more accurate data this configuration enables data acquisition in places that are inaccessible to the vehicle.

Workflow - Terrestrial Laser Scanner Model Development Process Data Capture Prior to data capture the target area is surveyed and a local system is produced to sit within the areas global system Data Capture (spatial & photographic) takes place via the terrestrial laser scanner & on-board high resolution digital camera mounted on a mobile trolley Approximately 300m of streetscape can be scanned per day Post Processing Very large point cloud files are pulled together into one project file Decimation of raw point cloud data to an appropriate size The decimated point cloud is digitised The result of the digitising process is a ‘Low Poly Model’ The next series of stages entail combining the 3D-geometry of the digitised model with the rectified photographs (ortho-photos) and integrating them into a real time environment. The definition of physical parameters, such as gravitation, lighting and collision are also possible at this stage, as well as the integration of the control mechanisms (walk, fly, turn, move, etc.) on keyboard commands and mouse. CAD Model The low poly model can be imported into the popular CAD software 3ds and textured using the Ortho-photos The result is a fully textured geometrically accurate reconstruction that can be used as it is or augmented and / or edited as required Microstation Model If required the master validated model can be delivered in Microstation format by converting the CAD files Interactive Model The CAD files are converted into Microsoft DirectX format so that it can be viewed and manipulated using the latest DirectX based interactive navigation software Extras, such as different scenarios, day and night, flood simulation etc can be added Output as a compiled executable of Model for use as a standalone application AND / OR Web Hosting AMT3D can facilitate interactive web hosting of the model This entails using our preferred publishing software to convert CAD files so that the AMT3D model can be viewed and manipulated online. Digital objects can be embedded into online models to provide the model with unique advertising and promotional capabilities

LASER SCANNER TECHNICAL SUMMARY

Background

RIEGL LMS-Z390

The new RIEGL LMS-Z390 Laser Scanner, with a range of up to 800 m @ Laser Class 1, repeatability up to 2 mm, a measurement rate of up to 20,000 pts / sec and an impressive field of view of up to 80° x 360°.

The terrestrial laser scanner system RIEGL LMS-Z390 consists of a highly accurate and fast 3D scanner, associated software and a calibrated and definitely orientated high-resolution digital camera.

The system provides data which lends itself to automatic or semi-automatic processing of scan data and image data to generate products such as textured triangulated surfaces or orthophotos with depth information.

The RIEGL LMS-Z390 is a rugged and fully portable sensor especially designed for the rapid and accurate acquisition of high-quality three dimensional images, providing a unique and unrivalled combination of wide field-of-view, high accuracy, and fast data acquisition.

Main Applications

• Architecture and façade measurement
• As built surveying
• Archaeology & cultural heritage documentation
• Civil engineering
• City Modelling
• Topography

The main strengths of AMT3D models are…

• Geometrically accurate to mm
• Photo-realistic
• Internet compatible
• Digital and hence totally flexible
• Relatively quick and hence cost effective to produce
• CAD compatible (AutoCAD, 3D Studio Max etc)

The data is obtained by using the high-resolution scanner to capture the target building’s 3dimensional geometric structure and a digital camera (mounted on the top of the scanner) to provide photographic texture, the data being amalgamated by the AMT3D technology.

Once produced the 3D model can be viewed directly in an Internet browser or combined with CAD (Computer Aided Design) data to provide ‘in-context’ visualizations. Video and audio can also be added to the model to further enhance and augment the immersive effect.

Street Mapper

The length of the post-production phase of the modeling process is a direct function of the complexity and length of the streetscapes within the environment being modeled and hence the number of scans required. However as a rule of thumb the production of an interactive 3D digital model requires 4 post processing days per scan day.