scholarly journals THE STUDY OF MOBILE LASER SCANNING DATA ADJUSTMENT RESULTS FOR LARGE SCALE TOPOGRAPHIC MAPPING

2020 ◽  
Vol XLIII-B2-2020 ◽  
pp. 197-203
Author(s):  
M. A. Altyntsev ◽  
K. H. Majeed Saber
Keyword(s):  
Urban Areas ◽  
Laser Scanning ◽  
Large Scale ◽  
Topographic Mapping ◽  
Control Points ◽  
Accuracy Estimation ◽  
Minimum Number ◽  
Requirements Document ◽  
Data Adjustment

Abstract. Mobile laser scanning (MLS) data are widely used for solving various tasks. To be sure that these data are appropriate for a specific task it is necessary to adjust data with a certain accuracy. Large scale topographic mapping is one from the tasks often solved by MLS data. Necessary accuracy of creating topographic plans is determined with a requirements document. Topographic plans are always created in a certain coordinate system. For this reason, MLS data should be previously transformed in the required one. For transformation control points measured with other more accurate methods should be applied. The quantity of necessary control points depends on a surveying area. For urban areas a lot of control points are required due to bad quality of GNSS signal. Much research has been conducted for these areas. For areas with open view of the sky it is required significantly fewer control points. Moreover, there are not so many vertical objects in areas with open view of the sky. Large errors can take place in the result of automatic adjustment of point cloud’s multi-passes. The results of both relative and absolute MLS data adjustment are given for the area with a good GNSS signal. The paper presents the results of accuracy estimation with different quantity of control points. The main goal of the paper is to determine the minimum number of control points for MLS data to be appropriate for creating topographic plans at a scale of 1:500 with a contour interval of 0.25 m.

scholarly journals SOIL MANAGEMENT IN THE URBAN ENVIRONMENT: TODAY AND FUTURE

2019 ◽  
Vol 1 (1) ◽  
pp. 66-71
Author(s):  
Bogdan Stanescu ◽  
Adriana Cuciureanu
Keyword(s):  
Performance Management ◽  
Urban Environment ◽  
Urban Areas ◽  
Large Scale ◽  
Current Data ◽  
Soil Protection ◽  
The European Union ◽  
Residential Areas

The present article presents the expertise realized by the Department of Environmental Monitoring Pollution Evaluation within the INCD ECOIND, in the evaluation of the quality of urban soils in the municipality of Bucharest and the main big cities in Romania. The current data available at the level of the 27 member states of the European Union show that annually over 100,000 hectares of land are introduced into the urban environment, a direct consequence of the development of cities. There are a number of legislative obstacles to strategic soil protection measures. Moreover, at the level of the local authorities there is a conflict regarding the measures of soil protection in the long term, on the one hand, and, the accelerated economic development in the short term, on the other. European environmental experts consider that the urban development, absolutely necessary for the economic growth, requires an adequate management of the natural resources in order for the development to be done on a sustainable basis, respectively to follow a series of strategic objectives. In our country, at least in the last decade, we find on a large scale the conversion of industrial areas into commercial or residential areas. The footprint of industrial activities can be found even after long periods of time present by identifying the remnant of soil pollution or in those areas known as historically polluted (for example the town of Copsa Mica). The conclusions stemming from the assessment of pollution in urban areas over large areas, in correlation with the potential sources of pollution, underline the need to monitor the quality of soils in the urban environment, but also to apply a performance management in order to protect this natural resource in the long term.

scholarly journals TECHNIQUE OF AUTOMATIC MOBILE LASER SCANNING DATA ADJUSTMENT

2021 ◽  
Vol 26 (4) ◽  
pp. 5-23
Author(s):  
Maxim A. Altyntsev ◽  
◽  
Karkokli Hamid Majid Saber ◽  
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
Control Point ◽  
Main Step ◽  
Control Points ◽  
Large Area ◽  
Road Signs ◽  
Automatic Mode ◽  
Building Walls ◽  
Data Adjustment

Adjustment is a main step in the preliminary processing of mobile laser scanning (MLS) data. As a result of this step, a point cloud is generated in a certain coordinate system. The modern software, provided with the corresponding surveying system, is capable of performing in automatic mode most stages of MLS data adjustment obtained for territories with different quantity of buildings. With a suf-ficient number of vertically arranged planar objects, such as building walls, the algorithms embedded in the software provide a high accuracy of relative adjustment, which consists in calculating and ap-plying corrections for trajectories obtained with re-scanning the same area. Absolute adjustment can also be carried out automatically, subject to the rules for placing control points in order to automatically detect them. This kind of adjustment involves transforming a point cloud with using control point coordinates measured with more accurate surveying methods. The accuracy of automatic relative adjustment can be significantly reduced with the almost complete absence of vertical flat objects. In this case, it is necessary to develop additional adjustment techniques capable of using not only flat objects of a large area, but also vertical objects, such as road signs and poles. Comprehensive technique of MLS data adjustment, which can use information on the position of road signs and poles for territories with an insufficient number of vertical flat objects is proposed. The accuracy estimation of both the relative and absolute MLS data adjustment according to the proposed technique was carried out. The choice of the required control point density for territories with different quantity of buildings is explained.

scholarly journals A REVIEW ON SPATIAL QUALITY ASSESSMENT METHODS FOR EVALUATION OF PAN-SHARPENED SATELLITE IMAGERY

2019 ◽  
Vol XLII-4/W18 ◽  
pp. 255-261
Author(s):  
F. Dadras Javan ◽  
F. Samadzadegan ◽  
S. Mehravar ◽  
A. Toosi
Keyword(s):  
Remote Sensing ◽  
Quality Assessment ◽  
Satellite Imagery ◽  
Urban Areas ◽  
Large Scale ◽  
Spatial Distortion ◽  
Sensing Applications ◽  
Fused Image ◽  
Spatial Quality

Abstract. Nowadays, high-resolution fused satellite imagery is widely used in multiple remote sensing applications. Although the spectral quality of pan-sharpened images plays an important role in many applications, spatial quality becomes more important in numerous cases. The high spatial quality of the fused image is essential for extraction, identification and reconstruction of significant image objects, and will result in producing high-quality large scale maps especially in the urban areas. This paper introduces the most sensitive and effective methods in detecting the spatial distortion of fused images by implementing a number of spatial quality assessment indices that are utilized in the field of remote sensing and image processing. In this regard, in order to recognize the ability of quality assessment indices for detecting the spatial distortion quantity of fused images, input images of the fusion process are affected by some intentional spatial distortions based on non-registration error. The capabilities of the investigated metrics are evaluated on four different fused images derived from Ikonos and WorldView-2 initial images. Achieved results obviously explicate that two methods namely Edge Variance Distortion and the spatial component of QNR metric called Ds are more sensitive and responsive to the imported errors.

scholarly journals A VOXEL-BASED METADATA STRUCTURE FOR CHANGE DETECTION IN POINT CLOUDS OF LARGE-SCALE URBAN AREAS

2018 ◽  
Vol IV-2 ◽  
pp. 97-104
Author(s):  
J. Gehrung ◽  
M. Hebel ◽  
M. Arens ◽  
U. Stilla
Keyword(s):  
Change Detection ◽  
Urban Areas ◽  
Laser Scanning ◽  
Large Scale ◽  
Point Clouds ◽  
Urban Environments ◽  
Detection Methods ◽  
Planar Surfaces ◽  
Occupancy Grids ◽  
Speed Up

Mobile laser scanning has not only the potential to create detailed representations of urban environments, but also to determine changes up to a very detailed level. An environment representation for change detection in large scale urban environments based on point clouds has drawbacks in terms of memory scalability. Volumes, however, are a promising building block for memory efficient change detection methods. The challenge of working with 3D occupancy grids is that the usual raycasting-based methods applied for their generation lead to artifacts caused by the traversal of unfavorable discretized space. These artifacts have the potential to distort the state of voxels in close proximity to planar structures. In this work we propose a raycasting approach that utilizes knowledge about planar surfaces to completely prevent this kind of artifacts. To demonstrate the capabilities of our approach, a method for the iterative volumetric approximation of point clouds that allows to speed up the raycasting by 36 percent is proposed.

scholarly journals Can 3D Point Clouds Replace GCPs?

2014 ◽  
Vol II-5 ◽  
pp. 347-354 ◽  
Author(s):  
G. Stavropoulou ◽  
G. Tzovla ◽  
A. Georgopoulos
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
Large Scale ◽  
Point Clouds ◽  
Field Work ◽  
Surface Model ◽  
Control Points ◽  
3D Point Clouds ◽  
Surface Models

Over the past decade, large-scale photogrammetric products have been extensively used for the geometric documentation of cultural heritage monuments, as they combine metric information with the qualities of an image document. Additionally, the rising technology of terrestrial laser scanning has enabled the easier and faster production of accurate digital surface models (DSM), which have in turn contributed to the documentation of heavily textured monuments. However, due to the required accuracy of control points, the photogrammetric methods are always applied in combination with surveying measurements and hence are dependent on them. Along this line of thought, this paper explores the possibility of limiting the surveying measurements and the field work necessary for the production of large-scale photogrammetric products and proposes an alternative method on the basis of which the necessary control points instead of being measured with surveying procedures are chosen from a dense and accurate point cloud. Using this point cloud also as a surface model, the only field work necessary is the scanning of the object and image acquisition, which need not be subject to strict planning. To evaluate the proposed method an algorithm and the complementary interface were produced that allow the parallel manipulation of 3D point clouds and images and through which single image procedures take place. The paper concludes by presenting the results of a case study in the ancient temple of Hephaestus in Athens and by providing a set of guidelines for implementing effectively the method.

scholarly journals A proposal of topographic map symbols for large-scale maps of urban areas in Brazil

2019 ◽  
Vol 1 ◽  
pp. 1-2
Author(s):  
Claudia Robbi Sluter ◽  
Silvana Philippi Camboim ◽  
Andrea Lopes Iescheck ◽  
Luciane Borges Pereira
Keyword(s):  
Land Use ◽  
Urban Areas ◽  
Large Scale ◽  
Topographic Maps ◽  
Topographic Mapping ◽  
Urban Landscapes ◽  
Topographic Map ◽  
Rural And Urban ◽  
Different Cultures ◽  
Theoretical Issues

<p><strong>Abstract.</strong> This paper addresses a historical issue in Brazil that is that topographic mapping has been performed without application of the theories of cartography to local reality. With the lack of research on this subject, the rules and standards for topographic mapping in Brazil are based on solutions that have been developed in other countries. Even though topographic maps are not a frequent topic of cartographic research, as cited by Kent (2009), when the methods, techniques, and standards are imported from other countries, they are established by considering different natural, rural, and urban landscapes; different histories of land use and occupation; and different cultures. Consequently, it is essential to develop studies that address the theoretical issues of topographic mapping and to verify their suitability to Brazilian reality, considering the geographical aspects that must be represented in topographic mapping. Such a foundation of scientific knowledge is essential to producing solutions that are adapted to the environmental conditions and needs of Brazilian users and society.</p>

scholarly journals TLS MODELS GENERATION ASSISTED BY UAV SURVEY

2016 ◽  
Vol XLI-B5 ◽  
pp. 413-420 ◽  
Author(s):  
F. Chiabrando ◽  
V. Di Pietra ◽  
A. Lingua ◽  
P. Maschio ◽  
F. Noardo ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Large Scale ◽  
Control Points ◽  
Survey Techniques ◽  
Multi Scale ◽  
Ground Control Points ◽  
Initial Stage ◽  
Registration Number ◽  
Aerial Vehicle ◽  
Gps Rtk

(TLS, Terrestrial Laser Scanning), and large scale mapping derived by UAV (Unmanned Aerial Vehicle) survey. This paper refers an example of 3D survey and reality based modelling applied on landscape and architectural assets. The choice of methods for documentation, in terms of survey techniques, depends primarily on issues and features of the area. &lt;br&gt;&lt;br&gt; The achieved experience, allow to consider that the easy handling of TLS has enabled the use in limited spaces among buildings and collapsed roofs, but the topographic measure of GCPs (Ground Control Points), neither by total station nor by GPS/RTK technique, was easily feasible. Even more than proving the ability of the integration of TLS and UAV photogrammetry to achieve a multi-source and multi-scale whole model of a village, the experience has been a test to experiment the registration of terrestrial clouds with the support of control points derived by UAV survey and finally, a comparison among different strategies of clouds registration is reported. Analysing for each approach a number of parameters (number of clouds registration, number of needed points, processing time, overall accuracy) the further comparisons have been achieved. &lt;br&gt;&lt;br&gt; The test revealed that it is possible to decrease the large number of terrestrial control points when their determination by topographical measures is difficult, and it is possible to combine the techniques not only for the integration of the final 3Dmodel, but also to solve and make the initial stage of the drafting process more effective.

scholarly journals kONSEP IMPLEMENTASI PENGEMBANGAN TOD PADA SIMPUL TRANSPORTASI MODA KERETA API (Studi Kasus: Provinsi Banten, Indonesia)

2021 ◽  
Vol 4 (1) ◽  
pp. 63
Author(s):  
Hera Zetha Rahman ◽  
Azaria Andreas ◽  
Akhmad Dofir ◽  
Perdana Miraj Sejatiguna ◽  
Nina Kade Nirmala
Keyword(s):  
Urban Areas ◽  
Large Scale ◽  
Main Function ◽  
Transit Oriented Development ◽  
Railway Stations ◽  
Train Station ◽  
Main Requirement ◽  
Surrounding Space ◽  
Time And Energy

<p class="FormatUI"><em>A train is a mass transportation means that can carry passengers or goods on a large scale, so that the Indonesian people use it as a means of transportation both within cities and intercity/ Along with this, the train station is the main requirement needed in the movement of the rail transportation mode. Apart from the main function of the station as a place for passengers to get on or off, stations can be developed into centers of urban activities by maximizing the use of space at the station and the utilization of the surrounding space which is integrated with the development of properties high density and other supporting facilities. To realize this, an effort is needed to maximize the potential for station development through the Transit Oriented Development (TOD) approach. The development of TOD at a railway station can create an ideal distance or radius from a transportation node to occupancy, creating lower cost, time and energy efficiency so as to improve the quality of life in urban areas, and it is hoped that it can reduce the maintenance costs of the station itself through additional functions that can generate revenue. In order to optimize the function of railway stations, especially in urban areas, this study was conducted to create a concept for regional development with the concept of TOD based on railway stations. This study used a qualitative approach with the study area located in Banten Province (outside the BPTJ working area), and data collection was carried out using purposive sampling method. The result is a station that has the potential to be developed into a transit-based area in Banten Province is the Serang Station</em><em>.</em></p>

scholarly journals TLS MODELS GENERATION ASSISTED BY UAV SURVEY

2016 ◽  
Vol XLI-B5 ◽  
pp. 413-420 ◽  
Author(s):  
F. Chiabrando ◽  
V. Di Pietra ◽  
A. Lingua ◽  
P. Maschio ◽  
F. Noardo ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Large Scale ◽  
Control Points ◽  
Survey Techniques ◽  
Multi Scale ◽  
Ground Control Points ◽  
Initial Stage ◽  
Registration Number ◽  
Aerial Vehicle ◽  
Gps Rtk

(TLS, Terrestrial Laser Scanning), and large scale mapping derived by UAV (Unmanned Aerial Vehicle) survey. This paper refers an example of 3D survey and reality based modelling applied on landscape and architectural assets. The choice of methods for documentation, in terms of survey techniques, depends primarily on issues and features of the area. <br><br> The achieved experience, allow to consider that the easy handling of TLS has enabled the use in limited spaces among buildings and collapsed roofs, but the topographic measure of GCPs (Ground Control Points), neither by total station nor by GPS/RTK technique, was easily feasible. Even more than proving the ability of the integration of TLS and UAV photogrammetry to achieve a multi-source and multi-scale whole model of a village, the experience has been a test to experiment the registration of terrestrial clouds with the support of control points derived by UAV survey and finally, a comparison among different strategies of clouds registration is reported. Analysing for each approach a number of parameters (number of clouds registration, number of needed points, processing time, overall accuracy) the further comparisons have been achieved. <br><br> The test revealed that it is possible to decrease the large number of terrestrial control points when their determination by topographical measures is difficult, and it is possible to combine the techniques not only for the integration of the final 3Dmodel, but also to solve and make the initial stage of the drafting process more effective.

Assessment of quality of life in patients with the effects of transient ischemic stroke

2016 ◽  
pp. 37-39
Author(s):  
A. Babirad
Keyword(s):  
Quality Of Life ◽  
Ischemic Stroke ◽  
Large Scale ◽  
Cerebrovascular Diseases ◽  
Control Measures ◽  
Sociological Research ◽  
Cerebrovascular Events ◽  
Sf 36 ◽  
Angioplasty And Stenting

Cerebrovascular diseases are a problem of the world today, and according to the forecast, the problem of the near future arises. The main risk factors for the development of ischemic disorders of the cerebral circulation include oblique and aging, arterial hypertension, smoking, diabetes mellitus and heart disease. An effective strategy for the prevention of cerebrovascular events is based on the implementation of large-scale risk control measures, including the use of antiagregant and anticoagulant therapy, invasive interventions such as atheromectomy, angioplasty and stenting. In this connection, the efforts of neurologists, cardiologists, angiosurgery, endocrinologists and other specialists are the basis for achieving an acceptable clinical outcome. A review of the SF-36 method for assessing the quality of life in patients with the effects of transient ischemic stroke is presented. The assessment of quality of life is recognized in world medical practice and research, an indicator that is also used to assess the quality of the health system and in general sociological research.

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