scholarly journals A METHOD FOR MONITORING BULGE OF ANCIENT CITY WALL AFTER REPAIR

2021 ◽  
Vol XLVI-M-1-2021 ◽  
pp. 221-224
Author(s):  
B. Feng ◽  
Y. Hu ◽  
M. Hou
Keyword(s):  
Deformation Monitoring ◽  
Point Cloud Data ◽  
Irreversible Damage ◽  
City Wall ◽  
Cloud Data ◽  
Actual Application ◽  
Ancient City ◽  
Characteristic Plane ◽  
Coordinate Conversion ◽  
The City

Abstract. The ancient city wall is affected by factors such as environment and man-made factors, and the formed bulging disease is particularly prominent, and even caused irreversible damage to the ancient city wall. Therefore, the bulging monitoring after the repair of the city wall should be the top priority of the deformation monitoring of the city wall. This paper proposes a new plan for monitoring the bulge after the repair of the city wall. According to the point cloud data before the repair, the characteristic plane is fitted to determine the bulge range of the city wall, and then observation signs are placed on the surface of the repaired city wall at the corresponding location where the bulging deformation is severe. By using a total station to monitor the space coordinates of the observation signs, the deformations perpendicular to the wall can be obtained through coordinate conversion, and then the bulging of the repaired city wall can be determined. The actual application results show that this method can effectively monitor the swelling of the ancient city wall after the repair.

scholarly journals AN ANALYSIS METHOD OF THE AMOUNT OF BRICKS USED IN PUZHOU ANCIENT CITY WALL BASED ON SLAM

2021 ◽  
Vol XLVI-M-1-2021 ◽  
pp. 813-819
Author(s):  
R. Wang ◽  
Z. Zhang ◽  
Y. Dong ◽  
Y. Li ◽  
Z. Li
Keyword(s):  
Point Cloud ◽  
Point Cloud Data ◽  
Analysis Method ◽  
City Wall ◽  
Cloud Data ◽  
External Wall ◽  
Ancient City ◽  
Digital Restoration ◽  
The City ◽  
Outer Cladding

Abstract. The calculation of the amount of bricks used in the area of falling-off is of great significance to the restoration of the ruins of ancient cities In order to support the digital restoration of the city wall of Puzhou Ancient City Site, this paper analyzed and calculated the amount of outer cladding brick of the city wall based on SLAM data. Firstly, the point cloud data of Puzhou city wall is obtained by SLAM technology. Secondly, the original point cloud is processed by Geomagic Studio software, and the area of the damaged area is accurately measured from the packaging model. Finally, based on the characteristics of brick masonry of ancient city walls, this paper estimates the amount of brick used in the area where the external wall of drum tower falls off, thus providing data support for the repair and maintenance of Puzhou ancient city.

Preservation Strategies of Longdong Ancient City Walls in Systematic Perspective

2016 ◽  
Vol 41 (3) ◽  
pp. 50-55
Author(s):  
Xiaohui Yu ◽  
Fei Wang ◽  
Lina Wang
Keyword(s):  
Point System ◽  
Specific Situation ◽  
Systematic Method ◽  
System Planning ◽  
City Wall ◽  
Ancient City ◽  
Historic Landmark ◽  
City Walls ◽  
The City ◽  
Great Portion

City wall is an important symbol of ancient Chinese cities with unique geographical and cultural characteristics. Thus, the preservation of this historic landmark is considered significantly important. However, numerous residential construction activities and changes in ecological environment have destructed a great portion of the city walls in recent years. This study looks into the preservation of the ancient city walls from the systematic perspective and in line with the actual characteristics of Longdong Region to provide guideline measures for the protection and restoration of such landmark. Cognition and preservation are adopted extensively to investigate the specific situation of and the factors that influence the ancient city walls in this region. Preservation strategies for the city walls, including the “Axis-Point” system, planning control, and authenticity readability, are presented. The ancient city walls in Longdong Region can be preserved by protecting the entire region, the city, and the main wall body. The systematic method and preservation strategies at the “macro perspective,” “medium perspective” and “micro perspective” levels can solve the preservation problems of the ancient city walls in Longdong Region effectively.

scholarly journals STUDY ON EXTRACTION AND EXPRESSION METHODS OF BULGING DISEASES IN ANCIENT CITY WALLS

2019 ◽  
Vol XLII-4/W20 ◽  
pp. 77-82
Author(s):  
Q. Song ◽  
Y. G. Hu ◽  
M. L. Hou
Keyword(s):  
Human Factors ◽  
Data Processing ◽  
Cultural Values ◽  
Processing Efficiency ◽  
City Wall ◽  
Ancient City ◽  
City Walls ◽  
Scan Data ◽  
The City

Abstract. The ancient city wall contains rich cultural values. Due to environmental and human factors, there are many diseases in the ancient city wall: bulging, cracking, etc., which will lead to the collapse or even death of the ancient city wall. Therefore, the monitoring and protection of the ancient city wall is imminent. This paper proposes a new scheme for bulging monitoring for wall bulging. The feature plane is fitted according to the actual scan data, the degree of bulging, the trend and the area size are determined, and the bulging deformation of the city wall is displayed in the form of an image. Simplify workflow, improve data processing efficiency, and display more intuitively.

scholarly journals Walk the Wall Athens: An Experiential Walk in the City

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Maria Karagiannopoulou
Keyword(s):  
21St Century ◽  
Mobile Application ◽  
Urban Landscape ◽  
World Heritage ◽  
Western Civilization ◽  
City Wall ◽  
Ancient City ◽  
Interactive Map ◽  
The City ◽  
Historical Centre

Athens is a historic capital widely known for its legacy left to Western civilization and its publicly recognized and well-studied monuments of world heritage. But what do we really know about the Athenian antiquities that have been integrated into the city’s modern canvas? In how many ways can the urban landscape of Athens be re-introduced to the modern traveler? Walk the Wall Athens is a bilingual mobile application that allows the user to wander, literally and metaphorically, through the streets of Athens in order to explore the traces of the Themistoclean city wall and to recover this important monument from oblivion. Just as the ancient city wall surrounds Athens as a historical chain that crosses all the neighbourhoods of the modern city’s historical centre, the route provided by the interactive map of the application introduces the visitor to the layout of the modern Athenian metropolis. Through a walk on the remains of the ancient fortification, the application Walk the Wall Athens attempts to spark the interest and excite the curiosity of the Athenian traveller of the 21st century, introducing him to a journey of 2,500 years of history.

scholarly journals TUNNEL POINT CLOUD FILTERING METHOD BASED ON ELLIPTIC CYLINDRICAL MODEL

2016 ◽  
Vol XLI-B1 ◽  
pp. 735-740
Author(s):  
Ningning Zhu ◽  
Yonghong Jiaa ◽  
Lun Luo
Keyword(s):  
Horizontal Plane ◽  
Point Cloud ◽  
Deformation Monitoring ◽  
Metal Stents ◽  
Point Cloud Data ◽  
Cylindrical Model ◽  
Cloud Data ◽  
Filtering Method ◽  
Tunnel Section ◽  
Periodic Monitoring

The large number of bolts and screws that attached to the subway shield ring plates, along with the great amount of accessories of metal stents and electrical equipments mounted on the tunnel walls, make the laser point cloud data include lots of non-tunnel section points (hereinafter referred to as non-points), therefore affecting the accuracy for modeling and deformation monitoring. This paper proposed a filtering method for the point cloud based on the elliptic cylindrical model. The original laser point cloud data was firstly projected onto a horizontal plane, and a searching algorithm was given to extract the edging points of both sides, which were used further to fit the tunnel central axis. Along the axis the point cloud was segmented regionally, and then fitted as smooth elliptic cylindrical surface by means of iteration. This processing enabled the automatic filtering of those inner wall non-points. Experiments of two groups showed coincident results, that the elliptic cylindrical model based method could effectively filter out the non-points, and meet the accuracy requirements for subway deformation monitoring. The method provides a new mode for the periodic monitoring of tunnel sections all-around deformation in subways routine operation and maintenance.

Earth-Rock Dam Deformation Monitoring Based on Three-Dimensional Laser Scanning Technology

2014 ◽  
Vol 926-930 ◽  
pp. 1918-1921 ◽  
Author(s):  
Ju Wang ◽  
Cheng Cai Zhang
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
Reference Model ◽  
Three Dimensional ◽  
Deformation Monitoring ◽  
Surface Model ◽  
Point Cloud Data ◽  
Cloud Data ◽  
The Earth ◽  
Dam Deformation

Three-dimensional laser scanning can obtain the complete geometry information of the dam quickly and accurately, and then achieve the overall deformation monitoring, which breaks the traditional limitation of single point monitoring and local monitoring. In this paper, the complete point cloud data of the dam was obtained by three-dimensional laser scanning technology, and the surface model of the earth-rock dam was constructed by three-dimensional spherical projection surface dam construction algorithm. Then the accurate three-dimensional surface model of the earth-rock dam was acquired, and the first phase of the model as reference model,with different periods of point cloud data collected were analyzed with the reference model to obtain information about the dam deformation.

scholarly journals TUNNEL POINT CLOUD FILTERING METHOD BASED ON ELLIPTIC CYLINDRICAL MODEL

2016 ◽  
Vol XLI-B1 ◽  
pp. 735-740 ◽  
Author(s):  
Ningning Zhu ◽  
Yonghong Jiaa ◽  
Lun Luo
Keyword(s):  
Horizontal Plane ◽  
Point Cloud ◽  
Deformation Monitoring ◽  
Metal Stents ◽  
Point Cloud Data ◽  
Cylindrical Model ◽  
Cloud Data ◽  
Filtering Method ◽  
Tunnel Section ◽  
Periodic Monitoring

The large number of bolts and screws that attached to the subway shield ring plates, along with the great amount of accessories of metal stents and electrical equipments mounted on the tunnel walls, make the laser point cloud data include lots of non-tunnel section points (hereinafter referred to as non-points), therefore affecting the accuracy for modeling and deformation monitoring. This paper proposed a filtering method for the point cloud based on the elliptic cylindrical model. The original laser point cloud data was firstly projected onto a horizontal plane, and a searching algorithm was given to extract the edging points of both sides, which were used further to fit the tunnel central axis. Along the axis the point cloud was segmented regionally, and then fitted as smooth elliptic cylindrical surface by means of iteration. This processing enabled the automatic filtering of those inner wall non-points. Experiments of two groups showed coincident results, that the elliptic cylindrical model based method could effectively filter out the non-points, and meet the accuracy requirements for subway deformation monitoring. The method provides a new mode for the periodic monitoring of tunnel sections all-around deformation in subways routine operation and maintenance.

Research on the Rehabilitation of the Ancient City Wall of the Wuchang Uprising Gate

2012 ◽  
Vol 166-169 ◽  
pp. 1526-1529
Author(s):  
Zhu Sun
Keyword(s):  
Ming Dynasty ◽  
Tang Dynasty ◽  
Large Scale ◽  
100Th Anniversary ◽  
The South ◽  
City Wall ◽  
Ancient City ◽  
City Walls ◽  
The Government ◽  
The City

To commemorate the 100th anniversary of the Xinghai Revolution, the government of Wuchang district in Wuhan City intends to rehabilitate rain-wind corridor, feudal pavilion and the city walls. After access to historical data, site survey, mapping, photographing and measuring, the rehabilitating engineering program of rain-wind corridor, feudal pavilion and the city walls of the Wuchang Uprising Gate is achieved. In the fourth year of Hongwu (1371), Ming dynasty, Zhou Dexing, the duke of Jiangxia, built Wuchang city on the basis of Yingzhou city of Tang dynasty. Wuchang city has large scale. In Ming and Qing dynasty, it was the legacy of county, town, city and province. Its diameter from the east to the west was of 2.5 km, with 3 km from the north to south. The thickness of wall foundation is 22.44 m, with top thickness 17.82 m. Nine gates were designed for the ancient city. The Uprising gate, one of the nine gate of the Wuchang ancient city, was opened to the south and also the busiest gate for entering the city. New Army Engineering Battalion of Hubei took the lead and fired the first shot. And then they occupied Zhonghe Gate and Chu Wangtai to welcome the South Lake artillery, Ma team and other revolutionaries.

The Date of the Tocra Graffiti

1980 ◽  
Vol 11 ◽  
pp. 65-72 ◽  
Author(s):  
J. M. Reynolds
Keyword(s):  
City Wall ◽  
Personal Names ◽  
Large Numbers ◽  
Ancient City ◽  
The Sixties ◽  
Recent Developments ◽  
The City ◽  
East West

The large numbers of roughly-cut inscriptions on the inner face of the ancient city wall at Tocra, in the area south of the east gate, have often attracted attention. Interest in them flagged when it was realised that they consisted essentially of personal names; but recent developments in onomastic studies have given a new significance to personal names. Moreover since R. G. Goodchild dug there in the sixties it has been apparent that the inscribed stretch of the city-wall had been utilised for one side of a gymnasium courtyard and that the inscriptions on it are ephebic, so that they should throw some light on a civic instituion very much at the heart of the city's life. My purpose here, however, is simply to clarify the date at which the surviving texts were cut.The gymnasium has produced two main and one subsidiary series of texts. The first consists of graffiti on blocks found in situ on the inner face of the city wall as described above, and also on the inner face of the gymnasium wall flanking the main east/west street of the city, with additional items on blocks which patently derive from the gymnasium, but are found loose or re-used in many other parts of the site. Their appearance gives the impression that they were the work of the ephebes themselves and, since they often overcut one another, that they were produced over a period of time. They normally present personal names without patronymics, often in groups or in pairs, and with a brief indication that the associated persons were customary companions and sometimes certainly lovers.

Excavations at Tocra (1985-1992)

2000 ◽  
Vol 31 ◽  
pp. 59-102 ◽  
Author(s):  
Ahmed M. Buzaian
Keyword(s):  
Late Antiquity ◽  
Late Antique ◽  
Faunal Remains ◽  
City Wall ◽  
Ancient City ◽  
The University ◽  
Pottery Kiln ◽  
The City ◽  
Early Islamic ◽  
Insight Into

AbstractThis article presents a preliminary report on the post-excavation analysis of excavations conducted between 1985 and 1992 by the Department of Archaeology of the University of Garyunis (Benghazi) at the ancient city of Tocra. The construction and design of the buildings excavated are analysed, with particular emphasis on the late antique phases; and descriptions of pottery, other artefacts (including two early Islamic coins) are given. The area appears to have been an artisan district, as evidenced by the finds of a pottery kiln, ovens, vats and other structures associated with manufacturing activities. Mortar and plaster samples were analysed to help phase the structures, and to compare the excavated vats with their counterparts at another site within the city. A limited study of the faunal remains gives some insight into diet at the site in late antiquity.The study shows clearly that Tocra remained inhabited after the Arab conquest (AD 640s), confirming suggestions of previous excavations at other sites within the city wall.

Sign in / Sign up

Export Citation Format

Share Document