Application of Three-dimensional Visualization Technology in Real Estate Management Jian Cui 1,a, Jiju Ma 2,b, Dongling Ma 1, c and Nana Yang 3,d

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1 Applied Mechanics and Materials Online: ISSN: , Vols , pp doi: / Trans Tech Publications, Switzerland Application of Three-dimensional Visualization Technology in Real Estate Management Jian Cui 1,a, Jiju Ma 2,b, Dongling Ma 1, c and Nana Yang 3,d 1 School of Civil Engineering, Shandong Jianzhu University, Jinan , China 2 School of Transportation Engineering, Shandong Jianzhu University, Jinan , China 3 Jinan Research Institute of Real Estate Surveying and Mapping, Jinan, , China a cuijian1202@126.com, b majiju88@gmail.com, c mdling2003@126.com, d yang_n @163.com Keywords: Three-dimensional (3D) modeling; Visualization; Real estate management Abstract. Real estates are the material basis of the survival and development of a city, and are important parts of urban development. We use 3ds Max as a tool to create 3D models of buildings and Supermap Deskpro.NET as a platform to make an effective combination of 3d models, real estate graphic data and real estate attribute data. Three-dimensional display of surveying and mapping information and three-dimensional visualization management of house property information are realized. Introduction Based on computer graphics, visualization technology and virtual reality technology (VR) etc., 3D visualization technology has been widely used in geographical informatics, ecology, science of surveying and mapping, architecture, medicine and other fields of science, greatly promoted the development of related disciplines with a series of achievement [1]. As the substantial components of digital city geospatial framework construction, real estate surveying and mapping informatization and 3 d visualization lead to spatialized, elaborate, dynamic, visual and actualized real estate information and services, which cover accurately each building, each period of time and each area, so that the property management implements its evolution from extensive management to precise management, from bull management to unified management. This paper starts from the graphic and attribute data of real estate, using 3ds Max to create 3D models of buildings and Supermap Deskpro.NET as an integration platform to realize 3D display of surveying and mapping information and 3D visualization management of house property information. Data Preparation Real estate surveying and mapping information is the main content of the real estate information, it consists of two parts, i.e., real estate surveying and mapping graphic data and attribute data [2]. The former mainly includes building property map and basal relief map, and the latter mainly refers to the attribute information of each building, of each layer and of each household. In order to conform to reality, we also collected the 2D plan of the building, and carried on the field survey, capturing photographs of campus landscape and landmark buildings in Shandong Jianzhu University for textures. Establishment of 3D Models In terms of 3D models of buildings, they are momentous constituents of 3D real estate information management system, which play the decisive role in the quality of the system [3]. Modification of the Base Map. Import 2D plans of the research area into the CASS software, and remove unnecessary ground objects and landforms, e.g. parterres, street trees, street lamps, etc. All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications, (ID: , Pennsylvania State University, University Park, USA-10/05/16,11:34:35)

2 2766 Advances in Civil and Industrial Engineering IV Then modify the 2D plans of buildings the same way, deleting appendages of buildings, remaining brief plans to construct three dimensional models. Production of Textures. To meet the requirements of modeling, photographs need to be refined in PhotoShop software, including adjustment of the shape, restoration of the shadow, etc. After that, we will import the 2D plans of a building, already modified in the procedure above (format: *.dwg), into 3ds Max, then zoom the base maps in the view of Top, Front, Left, Perspective to a suitable size respectively. Production of blank models (semifinished product). In the next, we will use polygon as a major tool to establish the model of each building one by one [4]. As the outline of a building is available through the 2D base map, we can sketch the contour of the building, and then convert it to an editable polygon, on this basis, we extrude the polygon to appropriate height, and that results in a blank model without bottom, which is the so-called semifinished product. And then, detail structures of the building require to be crafted in order to generate a complete 3D model. Over the course, modifiers and tools (like Extrude, Attach, Chamfer, Connect, Cut, Boolean, etc.) are frequently used. Texture Mapping. So far, we have produced textures as well as blank models, what we should do next is just making a combination of the two, i.e., mapping textures for the models. It s not difficult using UVW Mapping modifier to adjust the right picture suitably to a corresponding model. Up to this point, we have finished the whole process of making a lively 3D model for a building. Light Configuration. Proper light illumination results in the optimal effect of material [5]. We use three Target Spot and one Free Spot in the scene, and they are set in different positions. We can adjust the shadow of each spot respectively, so that the scene will looks more alive. The Realization of Three-dimensional Visualization Technology Three-dimensional visualization is a more intuitionistic technique to display 3 d data [6]. As it can show the spatial data more factually, and simulate geographic-information reality more realistically, three-dimensional visualization technology has brought great new technical innovation for GIS. Loading of 3D Models. Taking campus buildings for example, we ve created 3D model for each building, and will load them into the 3D scene in the rest. Before that, it is necessary to install the SuperMap plugin for 3ds Max. Merge all of the models together in 3ds Max, use the script tool of the plugin to return the origin of coordinates of each model to its center then bottom. Now for the most important part, we will take advantage of SuperMap plugin to generate model cache which can be loaded into SuperMap Deskpro.NET later. Click the function button To generate cache, enter the corresponding latitude and longitude values in the dialog box and select the file path for texture files, then press the OK button to finish the process. Import the digital orthophoto map (DOM) and digital elevation model (DEM) into SuperMap Deskpro.NET respectively as image dataset and grid dataset, both of them with the same projected coordinate system. Then load them as well as the model cache into the same new scene to establish a primary3d scene as shown in Fig.1.

3 Applied Mechanics and Materials Vols Fig. 1 Display of the primary 3D scene Three-dimensional Environment. In this section we will discuss the embellishment of the 3D environment, including the modeling of vegetation and roads and the setting of flying route. Modeling of vegetation. The vegetation types in a City are various, and there is no need modeling separately for some kinds of features, e.g., it s feasible to use DOM to express the grassy area of a city or dense forest on a hillside. But in order to keep the sense of reality, it s necessary to model the ornamental plants. It s convenient to realize the visualization of trees in SuperMap Deskpro.NET. Just simply add points that correspond to where the trees lie, then load the point dataset into the existing 3D scene as a layer and change the style of the layer. In more detail, choose a proper 3D tree model in the point database as the layer s style and the points will successfully display as trees in the scene. By the way, you can also produce your own tree model in the editor. Modeling of roads. In terms of road modeling, it s similar with tree modeling, just create a new line dataset and vectorize along the center of the each road, then put it into the scene and choose a proper 3D line symbol as the layer s style. Setting of Flying Route. Specifying the route and perform a 3D flying is one of the way to browse the 3D scene [7]. In SuperMap Deskpro.NET, a flying route is specified according to the points on the line. Information of the points stores in a file whose format is *.gml. So pick some points at the desirable places, then set an appropriate height and speed for the route and perform it to check it out. The final result is shown in Fig.2. Fig. 2 Final result of the 3 d campus

4 2768 Advances in Civil and Industrial Engineering IV Conclusions Three-dimensional visualization of real estate information can effectively implement function as estate information release and display, real estate transaction, real estate planning, residential property management so on and so forth [8]. In our research, 3D models of building were crafted in 3ds Max on the basis of graphic and attribute data of buildings in the campus, and a 3D scene was established realizing the three-dimensional visualization. Within the scope of super fine little scene production, there is a further dimension we have not delved into: terrain matching. We intend to pursue this line of work in the future to make it perfect. Acknowledgements This work was financially supported by Science and Technology Project of Colleges and Universities of Shandong Province (Grant No.J12LG53), Ministry of Construction P.R.China Science & Technology Planning Project (Grant No.2010-K9-24) and Housing and Urban-rural Development project of Shandong Province (Grant No.2011YK026). References [1] MOC of the P.R.C: Technical Specification for Urban Fundamental Geographic Information System (China Architecture & Building Press, China 2004). [2] MOHURD of the P.R.C: Technical Code for Three Dimensional City Modeling (China Architecture & Building Press, China 2010). [3] Q. Zhu, D.R. Li, Y.J. Gong and H.J. Xiong: Geomatics and Information Science of Wuhan University, Vol. 26 (2001) No.1, p.8. [4] P. Chen, H. Lin, P.C. Zhang, and S.Z. Wu: Geospatial Information, Vol. 9 (2011) No.3, p.65. [5] L. Cheng, Y.J. Zhang, J.Y. Gong, and X.G. Song: Science of Surveying and Mapping, Vol. 33 (2008) No.1, p.119. [6] Z.L. Jia and Y.L. Liu: Geospatial Information, Vol. 7 (2009) No.6, p.10. [7] X.W. Zhao, F.X. Jin, Y.L. Li, J. Wang and W.W. Xiao: Journal of Geomatics, Vol. 34 (2009) No.4, p.11. [8] M. Trapp, A. Semmo, R. Pokorski, C. D. Herrmann, J. Döllner, M. Eichhorn and M. Heinzelmann: International Journal of Heritage in the Digital Era, Vol.1 (2012) No.1, p

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