The production of 3D models of urban areas, using aerial photographs, is of great benefit to companies and small engineering offices. But the major problem is the high cost of Digital Photogrammetry Workstations (DPWS) that are currently used for the
production of this kind of models. In addition, the use of these workstations requires long experience and good knowledge in photogrammetry. In this paper, we propose an alternative solution for 3D modeling of urban areas from a stereoscopic pair of aerial photos, a low cost close range photogrammetry software and the applications of 3D modeling available in some Geographic Information System (GIS) platforms. The close range photogrammetry software is a low coast system, compared to DPWS, and it doesn’t require any spatial background in photogrammetry. This software is used to extract the heights of elements that exist in the study area. GIS is used to produce the 2D map from the aerial photo. This map and the height data are used later to produce the 3D model of the study area.
3D models of historical sites and monuments are very interesting in archaeology and digital tourism fields. These models help archeologists document historical sites and analyze the relationships between their components. Moreover, 3D models constitu
te an attractive factor that encourages visiting sites and presents virtual information about cultural heritage.
In this paper, we propose an approach that uses capabilities of CAD (Computer Aided Design) and GIS (Geographic Information System) systems to construct spatial and semantic database for historical sites and modeling them in 3D. Users of the mentioned database can use it to gather information about sites and to navigate across them via the animation capabilities in GIS.
The proposed ideas will be applied on the historical site of Ras-SHAMRA in Lattakia. Spatial data concerning the site will be acquired form a topographic plan designed in 2004. These data will then be processed and introduced into GIS environment. ArcGIS software will be used to achieve an Archeological Information System (AIS) for the site and to construct a 3D model of the site and the royal palace.
In close range photogrammetry, the required geometric data for object documentation can be obtained
from single photo or stereoscopic pairs of photos. But, the documentation of large historic monuments, the
stereo pair is not sufficient. So, we mus
t use many photos to cover the whole object. In this study, a new
approach for 3D modeling of historic monuments is presented. This one is the multi-images approach. It
takes the complicated geometric nature of object to be documented. This kind of modeling is one of most
important applications of close range photogrammetry. In this study the results the multi-images
approach is exposed by a practical example concerned a historic façade in Housn Souleman (Safita). We
used digital photos obtained by the digital camera Kodak 8MP. This camera has a good geometric
resolution suitable for precise documentation works. To achieve the modeling, some well known software
for documentation purposes were used.
This research aims to explore the potential of low cost video camera for 3D
modelling of large historical monuments. As we know, photos extraction is a fundamental
issue in any photogrammetric project. In fact, cost and time are dependent on photo
extraction method. Usually, photos are taken one by one assuring that every object point is
on two photos at least. This operation is time consuming in large scenes modelling. In the
other hand, video record is a simple operation and requires short time comparing to
traditional photo shooting. Then, it will be useful to suggest an approach to use video
recordings as a source of photos required for 3D modelling.
In the present study, we will evaluate the capability of two video cameras. The first
one is a commercial independent camera and the second is associated with a mobile
phone in the extraction of photos required for 3D modelling of a relatively large objects. It
should be noted that the resolution of video frames in mobile phone cameras (comparing to
professional ones) is less than the resolution of ordinary photos. Hence, 3D models
resulting using these frames will be good for applications that don’t require high precision.
Three dimensional modeling of utility networks is an important mean of networks design, implementation, management and maintenance. During the modeling process, we face a wide range of processes and procedures to arrive at the correct final model.
T
his research proposes a semi-automatic methodology for 3D modeling of infrastructure networks in GIS environment. This methodology is based on the ModelBuilder in ArcGIS software by developing two tools to automate the construction processes of 3D networks.
The first presents a tool to create a 3D Manhole layer from points, and the second is a tool to create a 3D pipe layer. For both tools, a work algorithm has been built, in addition to designing user interfaces elements. These tools are stored in a Toolbox called “3D Manhole & Pipe.tbx”.
The proposed methodology is an easy and an effective way to build 3D network models, and the developed tools allow the implementation of a set of necessary processes needed to build 3D networks.
