The monitoring of highwall slopes at open-pit mines is an important task to ensure safe mining. For this reason, several techniques such as total station, radar, terrestrial Light Detection and Ranging (LIDAR) can be employed for surface measurement. The objective of this study is to investigate mesh algorithms, which can be used to interpolate 3D models of pit walls. Experiments were carried out at Coc Sau open-pit mine at Quang Ninh province of Vietnam, and at experimental mine of Akademia Górniczo-Hutnicza University of Science and Technology in Cracow, Poland. First, 3D point cloud data for the study area was acquired by using terrestrial LIDAR, then was used to generate mesh surfaces using three algorithms-Delaunay 2.5D XY Plane, Delaunay 2.5D Best Fitting Plane, and Mesh from Points. After that, the results were rectified and optimized. Subsequently, the optimized meshes were used for generation of non-uniform rational basis spline (NURBS) surfaces. Then, the NURBS surface accuracy was assessed. The results showed that the average distance between surface and point cloud was within range of 5.6-5.8 mm with deviation of 6.2-6.8 mm, depending on the used mesh. Additionally, the quality of surfaces depends on the quality of input data set and the algorithm used to generate mesh network, and the accuracy of computed NURBS surfaces fitting into pointset was 4-5 times lower than that of optimized mesh fitting. However, the accuracy of the final product allows determining displacements on the level of centimeters.
Developing countries face the problem of overcrowded streets. It is caused by rapid urbanization processes, meanwhile, a development of public transport services is insufficient. Nowadays, southeast Asia cities invest in rapid transit systems. Construction of a metro line demands big financial expenses to create its infrastructure. On the other hand, bus service uses city roads, but travel is relatively slow and its operation depends on the traffic, especially during peak hours. Therefore, cities have to focus on complementary systems of buses and rapid transit. The paper presents analyses of the existing bus network for the city of Hanoi. While the first two lines of a metro system are still under construction, the buses remain the only public transportation service in the city. The bus routes and bus stops are evaluated. The network coverage of residential areas is assessed and the blind spots are determined. The bus stops network is compared with newly constructed rapid transit stations. The strong and weak points of the transport system are discussed. WYKORZYSTANIE GIS DO ANALIZ TRANSPORTU PUBLICZNEGO-PRZYKŁAD HANOI W WIETNAMIE Słowa kluczowe: transport publiczny, kolej miejska, populacja, analizy GIS, metro w Hanoi Abstrakt Kraje rozwijające się stają przed problemem zatłoczonych ulic. Jest to spowodowane gwałtownymi procesami urbanizacyjnymi, którym nie towarzyszy równie szybki rozwój transportu publicznego. Miasta Azji Południowo-Wschodniej inwestują w budowę systemów szybkiej kolei miejskiej. Budowa systemu metra wymaga jednak dużych nakładów finansowych. Obecnie autobusy korzystają z istniejących ulic, ale podróżowanie nimi jest wolne i uzależnione od natężenia ruchu ulicznego, szczególnie w godzinach szczytu. Dlatego też należy skupić się na budowie wzajemnie uzupełniającego się systemu autobusów i kolei. Artykuł prezentuje analizę istniejącej sieci autobusowej w mieście Hanoi (Wietnam). Podczas gdy dwie pierwsze linie metra są nadal w budowie, autobusy pozostają jedynym transportem publicznym w mieście. W publikacji przeanalizowano przebieg tras autobusów oraz rozmieszczenie przystanków. Wyznaczono pokrycie stref zamieszkania przez istniejącą sieć tras oraz określono "martwe punkty". Położenie istniejących przystanków autobusowych porównano z położeniem budowanych stacji metra. W oparciu o analizy omówiono mocne i słabe strony istniejącego i powstającego systemu transportu publicznego.
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