Building on many years experience in Laser Scanning, Tech27 Systems Ltd has become a pioneer in the process of integrating precise detailed 3D Documentation, Structural Survey Analysis of historical structures or excavation sites, to produce a complete package that aids in the preservation and restoration of historical monumental structures.
Using this cutting edge technology to create exceptionally accurate digital 3D models of the structure, beautiful murals, valuable and divine Items (crowns, antique jewellery etc.) and decorative art, in order to ensure that its fully breathtaking beauty is captured in its entirety. This assists in the management and conservation of the site, including valuable items, inventory of the active temple, Catalogue of artifacts, Conditional Assessment of the Structure, Documentation of the Deformations and also provide virtual access to a wider audience of interested parties who may not have a chance to visit in person.
3D Laser Scanning is a rapid, non-contact, accurate and objective method for digital documentation of the built environment, buildings, urban streetscapes, heritage structure, archaeological sites and terrain. Ideal for quickly capturing highly accurate and detailed as-built conditions of historical structures and buildings. This technology can produce detailed 3D models, 2D drawings, and a guide to preservation and virtual reconstruction of heritage sites. This technology has proven to be a great way of preserving information about sites in a very detailed and complete style to facilitate reconstruction if a significant part is lost to natural or man-made disaster.
3D Laser Scanning captures spatial data by the use of laser light. It emits a laser beam from a rotating mirror out towards the area being scanned. The Laser Scanner can be set to scan within set coordinates. The Mobile Laser Scanner creates a 3D Image of an Object within a 120m field-of view. The image, know as a point cloud, is the compilation of millions of XYZ data point coordinates.
The point cloud works inside CAD and modelling software to complete CAD analysis and visualisations. Scanning at a rate of 976,000 points per second and accuracy up to +2mm.
Tech27 Systems has successfully scanned and digitised several heritage sites in India.
3D scanning is a non-contact rapid survey technique which results in high density, precise survey points in the form of 3D point clouds. The 3D Scanner is similar to a video camera which captures in 3D. The scanner captures up to 16 frames per second. These frames are aligned automatically in real‐time, which make scanning easy and fast. This is especially important for the creation of special effects and research. Because of the high quality, the textured models can be used in Heritage documentation.
3D Scanners are portable, phenomenally quick and can be used with objects of various sizes. There’s no need to move scanned items or to place markers on the object. These are the advantages that make the 3D Scanner an indispensable tool in the preservation of the world’s cultural heritage.
The scanner is powered by a small battery and this has to be positioned in a suitable location close to the scanner. The Scanner is then connected to a laptop with the software on it. Once all the cables (transmitter, receiver, USB, power, wand) have been hooked up to the scanner a few minutes initialisation is necessary. The best scanning resolution is set.
The Scanner gathers sweeps of data; the scanner is held approximately 15cm away from the object and moved at a slow and consistent pace across the object. The operator’s skill in maintaining a constant speed and a steady hand ensure that the data comes back clean. An unsteady sweep will result in erroneous lines in the data. The sweeps are continued until the entire surface of the stone has been surveyed, a process which has been likened to virtually painting the stone.
Tech27 Systems was tasked with the 3D documentation of a 2000 year old temple, which is one of the 108 great Siva temples in the world. The temple is housed in a compound wall with an extent of 3¼ acres of land in a square shape, with a 50 feet high flag mast, rounded walls with murals and sculptures. Due to its historic importance and age, the structure was fragile, intricate and required a very careful surveying approach. Due to long term exposure to the environment, the murals and artwork had developed hairline cracks and high moisture content. No direct contact was allowed, but the surveying output required millimeter accuracy.
Tech27 provided a turnkey solution that included laser survey, data processing, 3D modelling and 2D detail drawings as per the client’s requirement. A long range laser Scanner with a range of up to 120 meters and a 360° x 305° field of view was used. A scanning rate of 976,000 points per second and accuracy up to +/-2mm was achieved. The shape, position and spatial locations of objects are recorded by millions of points, each with a latitude, longitude and elevation coordinate. After a few days, 36 colour scans were obtained to produce a detailed, 3D data set of the entire temple. Inaccessible and dark areas posed no complications, due to the scanners self-illuminating infrared laser and remote flash control. The scanner’s compact design allowed them to work among the pillars of the temple, and the tripod ensured setup times were quick and easy. Once the scans had been aligned and cleaned, multiple software programs were used to create interactive models. Every level of detail is now viewable, from different sculpture works and even inscriptions on the inner roof pillars 360°
An ambitious project using cutting edge technology to create exceptionally accurate digital 3D Models of beautiful marble mausoleum, Sheikh Salim Chisti; and a large number of motifs. Inside has a beautiful array of impressive stone screens and the tomb is located in the centre of the main hall, which has a single semi-circular dome, the plinth is ornamented with mosaics of black and yellow marble arranged in geometric patterns. Architectural features marking the incorporation of indigenous architectural styles in the construction, in order to ensure that its fully breathtaking beauty is captured in its entirety to help in the management and conservation of the site, conditional assessment of the structure and documentation of the deformations. The heritage conservator required elevations, all floor plans, sections and also high resolution orthoimages.
LOCATION: Fatehpur Sikri
ON-SITE TIME: 3 Days; 62 color scans
COMPLETION TIME: 20 working days 2 persons
FINAL PRODUCT : 3D Model, 2D data in CAD format and Orthophoto.
In early 2015, we won the project of 3D laser scanning of Sheikh Salim Chisti Tomb in Fatehpur Sikri. Tech27 provided a turnkey solution that included laser survey, data processing, 3D modelling and 2D detail drawings as per the client’s requirement. A long range laser Scanner with a range of up to 120 meters and a 360° x 305° field of view was used. A scanning rate of 976,000 points per second and accuracy up to +/-2mm was achieved. The shape, position and spatial locations of objects are recorded by millions of points, each with a latitude, longitude and elevation coordinate. The mausoleum was scanned entirety in 3 days. Single scans (a total of approximately 62 positions of scanner) were integrated into a one coordinate system and the final point cloud was used to create a full 2D inventory of the mausoleum. We plotted precise floor plans, sections with views and elevation drawings. Thanks to laser scanning we were able to collect full spatial information of this historic building. We have obtained a very high accuracy output to +/-2mm.