A Method to Calculate Porosity of Loess Based SEM and its Application

2012 ◽  
Vol 256-259 ◽  
pp. 179-182
Author(s):  
Peng Ran Song ◽  
Chang Ming Wang
Keyword(s):  
Three Dimensional ◽  
Digital Terrain Model ◽  
Sem Images ◽  
Preparation Methods ◽  
Terrain Model ◽  
Double Peaks ◽  
Digital Terrain ◽  
Structure Changes ◽  
Before And After ◽  
Large Distribution

Research the structure changes before and after collapsible experiment of loess microstructure. Using artificial preparation methods prepared different moisture samples of Liaoxi loess. Do collapsible test and Scanning electron microscope test with the prepared samples. According to Digital Terrain Model theory, three-dimensional porosities were calculated based on gray scale information from the SEM images extracted by MATLAB. The results are shown following as: the microstructure of loess samples is getting dense, the average number of pore of samples obviously increases and the pore area decreases after the sample is collapsed. The distribution before and after the collapsibility of gray value has certain regularity. The before one has double peaks, large distribution. The after one has single peak, concentrate distribution and meets normal distribution.

Application of Bentley Power Rail Track Software in the BIM Railway Design

2014 ◽  
Vol 587-589 ◽  
pp. 1091-1094
Author(s):  
Xi Sheng ◽  
Hua Peng Luo ◽  
Ping Wang
Keyword(s):  
Cross Sections ◽  
High Efficiency ◽  
Three Dimensional ◽  
Digital Terrain Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Rail Track ◽  
Terrain Model ◽  
Digital Terrain ◽  
Design Software

Belonging to the Bentley Microstation series which work as one of the BIM platforms, the Bentley Power Rail Track shows huge advantages in the railway design for its visibility, high efficiency, advance, reliability and so on. This paper introduces the way to build the digital terrain model, alignments, cross sections, turnouts and to display the three-dimensional model of the railway for the Bentley Power Rail Track 3D railway design software. It provides application preparation for the BIM railway design and achieves the preliminary exploration of BIM applications. Bentley Power Rail Track proves capable of the BIM railway design.

scholarly journals Assessment of the Role of Snowmelt in a Flood Event in a Gauged Catchment

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 506 ◽  
Author(s):  
Jesús Mateo-Lázaro ◽  
Jorge Castillo-Mateo ◽  
José Sánchez-Navarro ◽  
Víctor Fuertes-Rodríguez ◽  
Alejandro García-Gil ◽  
...  
Keyword(s):  
Hydrological Cycle ◽  
Digital Terrain Model ◽  
Terrain Model ◽  
Rain Gauges ◽  
Digital Terrain ◽  
Before And After ◽  
Thawing Process ◽  
Rainfall Model

An actual event that happened in the Roncal valley (Spain) is investigated and the results are compared between models with and without snowmelt. A distributed rainfall model is generated with the specific data recorded by the rain gauges of the catchment during the episode. To describe the process of water routing in the hydrological cycle of the basin, a model is used based on combinations of parallel linear reservoirs (PLR model), distribution by the basin, and tip-out into its drainage network configured using a digital terrain model (DTM). This PLR model allows simulation of the different actual reservoirs of the basin, including the snow and the contribution due to its melting which, in the model, depends on the temperature. The PLR model also allows for a water budget of the episode where, in addition to the effective rainfall contribution, the water that comes from the thaw is taken into account. The PLR model also allows determination of the amount of water that exists in the basin before and after the episode, data of great interest. When comparing the simulations with and without taking into account the thawing process, it is evident that the intervention of the snow reservoir has been decisive in causing a flood to occur.

Research on Algorithm of Delaunay Triangulation Net Interpolating the Best Point

2014 ◽  
Vol 1044-1045 ◽  
pp. 1278-1282
Author(s):  
Xing Guo Qiu ◽  
Zheng Liu
Keyword(s):  
Delaunay Triangulation ◽  
Complex Terrain ◽  
Three Dimensional ◽  
Digital Terrain Model ◽  
Kriging Interpolation ◽  
Control Points ◽  
Interpolation Algorithm ◽  
Terrain Model ◽  
Digital Terrain ◽  
Technological Tool

Aiming at the folds caused by the sparse data in the process of DTM (Digital Terrain Model), this article proposed a method of interpolating spatial control points based on Delaunay triangulation and Kriging interpolation algorithm. The terrain data of an area with complex terrain in Xianyang was used to construct terrain model according to the proposed algorithm. Experimental results show that the method can finish the interpolation of the terrain denser data quickly and accurately, and it provides an efficient technological tool for building a true three-dimensional terrain model.

scholarly journals Evaluation On Different UAV’s Georeferencing Points to Generate Accurate Orthophoto and Digital Terrain Model

2021 ◽  
Vol 18 (2) ◽  
pp. 67
Author(s):  
MUHAMMAD HAFIZ AIZUDDIN BIN MOHD ZAIDI ◽  
Khairul Nizam Tahar
Keyword(s):  
Autonomous Navigation ◽  
Three Dimensional ◽  
Digital Terrain Model ◽  
Optimum Number ◽  
Terrain Model ◽  
Aerial Photogrammetry ◽  
Digital Terrain ◽  
Ground Control Points ◽  
Waypoint Navigation ◽  
User Friendly

UAV or drone application of autonomy ranging can be divided into several levels, from basic hovering and position over trajectory tracking and waypoint navigation to fully autonomous navigation. This study used the DroneDeploy application for an autonomous flight mission. It is the process of taking photographs from an aircraft or other flying objects with a camera mounted on them to produce a three-dimensional (3D) map from the images captured, including a digital terrain model (DTM) and orthophotos. As for this study, the same output will be generated, but different flight parameter applications were used. Therefore, the study determined the optimum number of ground control points (GCPs) and evaluated the accuracy of the final results for each flight design. Acquired data were processed using the Pix4D modeller software due to the user-friendly factor and faster processing rate offered by the software. The results were analysed, and recommendations were made for future study improvement and to avoid similar problems. This study is useful for the mapping industry to achieve high accuracy results.  Keywords: Aerial photogrammetry, Flight Parameter, UAV apps, DTM, Orthophotos, GCPs

scholarly journals USING REMOTE SENSING AND GIS TO CREATE GEOGRAPHICAL BASES FOR THEMATIC MAPS

2021 ◽  
Vol 26 (5) ◽  
pp. 119-125
Author(s):  
Oyunkhand Byamba ◽  
◽  
Elena L. Kasyanova ◽  
Keyword(s):  
Remote Sensing ◽  
Three Dimensional ◽  
Digital Terrain Model ◽  
Gis Technology ◽  
Gis And Remote Sensing ◽  
Terrain Model ◽  
Digital Terrain ◽  
Terrain Models ◽  
Triangulation Network ◽  
Eastern Mongolia

The development of science always depends on technological progress. Cartography is rapidly changing and developing with the introduction of new computer technologies, such as GIS and remote sensing of the Earth. Recently, there have been qualitatively new types of cartographic products, in particular 3D terrain models, which in cartography are becoming a universal, optimal and operational method for displaying terrain. The article discusses a method for creating a three-dimensional digital terrain model in the form of an irregular triangulation network based on SRTM data and GIS technology on the example of the Khenti aimag of Eastern Mongolia.

scholarly journals AN EXPERIMENT ON FORMATION OF A SPATIAL BASIS FOR THREE-DIMENSIONAL MODELING OF TERRITORY

2020 ◽  
Vol 6 (2) ◽  
pp. 152-157
Author(s):  
Aylash A. Shannaa ◽  
Ekaterina N. Kulik
Keyword(s):  
Aerial Photography ◽  
Three Dimensional ◽  
Digital Terrain Model ◽  
Technological Scheme ◽  
Terrain Model ◽  
Three Dimensional Modeling ◽  
Digital Terrain ◽  
Dimensional Modeling

The article discusses the technology for creating the spatial basis of a digital terrain model, the data for which was obtained by aerial photography of the territory. Also, as part of the study, the technological scheme of the stereophotogrammetric method was analyzed and its practical testing was carried out.

scholarly journals CLOSE RANGE DIGITAL PHOTOGRAMMETRY APPLIED TO TOPOGRAPHY AND LANDSLIDE MEASUREMENTS

2016 ◽  
Vol XLI-B5 ◽  
pp. 875-880 ◽  
Author(s):  
Wen-Cheng Liu ◽  
Wei-Che Huang
Keyword(s):  
Low Cost ◽  
Digital Terrain Model ◽  
Landslide Monitoring ◽  
Digital Photogrammetry ◽  
Terrain Model ◽  
Digital Terrain ◽  
Gps Measurement ◽  
Before And After ◽  
Close Range ◽  
Central Taiwan

Landslide monitoring is a crucial tool for the prevention of hazards. It is often the only solution for the survey and the early-warning of large landslides cannot be stabilized. The objective of present study is to use a low-cost image system to monitor the active landslides. We adopted the direct linear transformation (DLT) method in close range digital photogrammetry to measure terrain of landslide at the Huoyen Shan, Miaoli of central Taiwan and to compare measured results with e-GPS. The results revealed that the relative error in surface area was approximately 1.7% as comparing the photogrammetry with DLT method and e-GPS measurement. It showed that the close range digital photogrammetry with DLT method had the availability and capability to measure the landslides. The same methodology was then applied to measure the terrain before landslide and after landslide in the study area. The digital terrain model (DTM) was established and then was used to calculate the volume of the terrain before landslide and after landslide. The volume difference before and after landslides was 994.16 m<sup>3</sup>.

Geoarchaeological mapping of Stone Age sites and mineral outputs of Titovskaya Sopka (Eastern Transbaikalia): a practical aspect

2020 ◽  
Vol 26 (9) ◽  
pp. 13-23
Author(s):  
P. Moroz ◽  
◽  
K. Kurganovich ◽  
M. Bosov ◽  
G. Yurgenson ◽  
...  
Keyword(s):  
Raw Materials ◽  
Three Dimensional ◽  
Digital Terrain Model ◽  
Contact Metamorphism ◽  
Practical Implementation ◽  
Mineral Raw Materials ◽  
Terrain Model ◽  
Dense Cloud ◽  
Digital Terrain ◽  
Eastern Transbaikalia

The practical implementation of the possibilities of using unmanned aerial vehicles (UAVs) in carrying out geoarchaeological mapping of the Sukhotinsky geoarchaeological region is shown. The object of the study is the Sukhotinsky geoarchaeological region (Eastern Transbaikalia), associated with the source of mineral raw materials - the Titovskaya Sopka paleovolcano. The aim of the study is to create orthophotomap and digital terrain model specified. The objectives of the study included geoarchaeological mapping of the territory of the study area using modern hardware and software methods using algorithms for reconstructing a three-dimensional scene from photographs, such as structure from motion (SfM), adapted to the tasks of geoarcheology and mapping of volcanics, as well as the products of their contact metamorphism; coordination of ground control points’ network and marking of their location in a way that allows them to be identified from photographs taken by UAVs; realization of aerial photography of the area under consideration, using UAVs;implementation of algorithms for photogrammetric processing of images using the SfM method with obtaining a spatially-oriented dense cloud of terrain points; post-processing of a dense cloud of points with obtaining a three-dimensional terrain model and a high spatial resolution orthophotomap. The relevance of the work lies in the practical implementation of modern GNNS technologies using an unmanned aerial vehicle for mapping geoarchaeological objects. Analysis and interpretation of high-resolution images taken from UAVs and other digital and cartographic materials, processing and digitization of images were taken as research methods. An orthophotomap and a digital terrain model were created and analyzed. Areas of microrelief change were revealed. The theoretical and practical significance of the study consists in creating an orthophotomap and a digital terrain model of the Sukhotinsky geoarchaeological region using modern hardware and a UAV, representing a digital geoarchaeological mapping of archaeological sites, including all hypsometric levels and outcrops of mineral raw materials on an area of 2,4 km²

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