An Undergraduate Project with Terrestrial Laser Scanner for Purpose of Architectural Survey

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1 Theory and Application of Laser Scanning ISPRS Summer School 2007 Ljubljana,Slovenia An Undergraduate Project with Terrestrial Laser Scanner for Purpose of Architectural Survey Cemal Özgür KIVILCIM ISPRS WG VI/5 & SC, July 6th 2008 Ljubljana,Slovenia MSc Student, Istanbul Technical University/ Turkey Istanbul Metropolitan Municipality, Project Department, Directorate of Historical Sites Protection Turkey

2 A poster design for the European City of Culture İstanbul- 2010

3 Content Motivation Method Discussion and Results Examples

4 Motivation History of Turkey Protecting The Cultural Heritage Demand and Need of Architectural Survey Meeting the Goals for a sustainable update education content

5 Use of Laser Scanning Photogrammetry and conventional geodetic survey methods are widely used for the restoration and conservation works, architectural, survey and documentation. With the developments in the laser technology, laser scanner systems are recently used in the survey of architectural structures.

6 Method The workflow can be summarized as in four steps: 1. Target Selection and Laser Scanning 2. Registration of Point Clouds 3. Digitalization 4.Final Process

7

8 General Information on Workflow The point cloud data was used to produce 2-D surfaces. Points within the same surfaces were used as reference and the façade of the building was produced by digitization of the surfaces.

9 Equipment and Target Case Study : The view of the Sample Building Equipment: MENSI GS-100 Terrestrial Laser Scanner

10 Scan Station 2

11 Unregistered Scans

12 Control Points

13 Control Point The identified volume of the predefined sphere in the reference space The recognized control point in the point cloud

14 Residual Errors For the Spheres Station Number Of Scans Per Station Number of Scans Per Target Residual Error (mm) Station_1 Sphere_1 Sphere _2 Sphere _3 Sphere _4 Sphere _ Station _2 Sphere _1 Sphere _2 Sphere _3 Sphere _ Station _3 Sphere _1 Sphere _2 Sphere _3 Sphere _

15 Mean square error of coordinates of Control Spheres Station X (mm) Y (mm) Z(mm) Fit error (mm) Distance To Scanner (m) Station_1 Sphere_1 Sphere _2 Sphere _3 Sphere _4 Sphere _ Station _2 Sphere _1 Sphere _2 Sphere _3 Sphere _ Station _3 Sphere _1 Sphere _2 Sphere _3 Sphere _

16 Dealing with Point Clouds

17

18 Digitalization

19

20 Final Output

21 Discussion And Results Laser point clouds provide an opportunity to work in 3-D Environment with the independence of scale. On the other hand during the whole workflow, the technology and the software played a major role for the production time. During the digitalization progress, it has seen that the reflected laser points and the low contrast areas in the point clouds have bad influence on determining the shapes. Therefore scan parameters such as distance to the object, radius of the laser signal, object materials and environmental conditions like shadows and bright surfaces are the means to improve the quality and accuracy of the point clouds which means a better product.

22 Discussion And Results 2 Still hardware and software technologies have disadvantages on very high density of point clouds. The technique applied in this work, provides an easy way especially for the works of simple shaped buildings. Therefore an algorithm combined with rectification of building images and laser point clouds for better object orientation are used in different projects. This undergraduate project is one of the very first projects where undergraduate students actively had the chance to use TLS in Yildiz Technical University, Turkey. With the help of such projects, the students get familiar with the recent technologies and meet the goals of update education contents of the department.

23 Example Works Istanbul Metropolitan Municipality, The project for generating the econometric model for the peninsula of the old Istanbul which covers 1500 hectar. The project contains plans of façades and 3-D models of buildings for the different disciplines; urban planners, architects, restorers, engineers.

24 An Undergraduate

25

26

27

28 Süleymaniye in the past Source:unknown

29 SÜLEYMANİYE

30 KİRAZLI MESCİT SOKAĞA AİT NOKTA BULUTU VERİ ÖRNEĞİ

31 3-B NOKTA BULUTU ÜZERİNDEN ÇİZİM ÖRNEĞİ

32 3-B CAD ÇİZİM ÖRNEĞİ

33

34

35

36 Thank you for your attendance! Cemal Özgür KIVILCIM

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