Nguyen Quoc Long

Hanoi University of Mining and Geology · Mine Surveying

Underground mining-induced land subsidence may cause serious damage to engineering structures (e.g., buildings or roads) therefore, it is necessary to predict the subsidence with the highest possible accuracy. This paper proposes a new method for estimating preliminary values of the parameters to the modified Knothe time function, resulting in an i...

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...

In Vietnam, there are a huge number of quarries that are exploited and mainly provide materials to the construction sector of the country. However, most of the quarries are operating without topographic plans due to a lack of surveying activities. This paper introduces an approach of using low-cost UAVs to produce digital surface models which in tu...

The use of lightweight Unmanned Aerial Vehicle with the aerial photogrammetry approach to construct the Digital Surface Model (DSM) has been effectively applied for various types of topography. However, the ability to carry out this approach for huge active open coal mines is insufficiently investigated, furthermore, the influences of topographical...

UAV technology is being applied for DSM generation in open-pit mines with a well-established fact that the precision of such DSM is improved by increasing the number of ground control points (GCPs). however, DSMs are updated frequently in an open-pit mine where the surface is excavated continuously. This imposes a challenge to arrange and maintain...

Mekong Delta is an area with an important position in the socio-economic development of Vietnam. However, due to the impact of climate change as well as of the construction of hydroelectric dams in the upstream of the Mekong River in recent years, saline intrusion and flooding have been occurred because of high tide. According to published research...

The database infrastructure of the smart city includes a 3D geospatial data system that serves as a platform for various applications, such as designing, building, and proposing emergency response plans in. Currently, ground imaging technology and unmanned aerial vehicle (UAV) imaging technology are the data collection methods often employed in bui...

Continuously Operation Reference Stations (CORS) networks provide surveying, mapping, and positioning services and play a crucial role in determining crustal displacement. This study processed the continuous Global Navigation Satellite System (GNSS) data collected from 55 CORS stations in the TAST’s CORS in Vietnam to determine the crustal displace...

Fine particulate matter (PM2.5) leads to respiratory and cardiovascular diseases. Nowadays, PM2.5 monitoring on a large scale is a significant concern. The study aims to estimate the PM2.5 concentrations and assess the effect of open-pit mining and urbanization on PM2.5 concentrations by using satellite observations and ground-based stations over B...

The use of unmanned aerial vehicles (UAVs) is increasing in the mining industry because of the obvious economic and environmental benefits as well as reducing the risk to mineworkers. This paper presents a review of recent developments in relation to the applications of UAVs in surveying and mapping of surface, underground, and abandoned mines. Add...

The georeferencing procedure is to transform geospatial data from a local coordinate system to a global coordinate system, notably geodetic coordinate system on a geocentric datum. In this paper, both the one-step and two-step approaches of indirect georeferencing of 3D point cloud from terrestrial laser scanning are investigated. The georeferencin...

Tram rail transport is one of the important transport systems in underground coal mines. The stability of the tramway system in a mine is influenced by many factors, such as geological and mining conditions. In order to evaluate the stability of tramway tracks in underground coal mines, monitoring activities are carried out periodically. This activ...

Recently, the rapid development of unmanned aerial vehicle (UAV) has led to increasingly popular applications of this technology in the field of surveying and mapping. This article presents the result of developing a procedure to produce large-scale topographic maps for open-pit mines in Vietnam in which unmanned aerial vehicles (UAV) are used to c...

Groundwater is the primary source of water supply for drinking, eating, living, and using in agriculture in the Ba river basin. In recent years, the rapid growth of the population leads to an increased need for water and food, this has put water resources under severe stress. The main objective of this study was to investigate the groundwater level...

Purpose. To propose an approach that can be applied effi ciently when selecting the coordinate system used in hydroelectric construction in Viet Nam. Methodology. The effi ciency of the proposed approach is fi rst demonstrated by comparing the relative reduction of distances between the Gauss-Krüger and 3-degree and 6-degree UTM projections. It is...

In Vietnam, there are a huge number of quarries that areexploited and mainly provide materials to the construction sector of thecountry. However, most of the quarries are operating without topographicplans due to a lack of surveying activities. This paper introduces anapproach of using low-cost UAVs to produce digital surface models whichin turn ar...

Recently remarkable advancement development of unmannedaerial vehicles (UAVs) has been observed and their applications have beenshown in many fields such as agriculture, industry, and environmentalmanagement. However, in the mining industry, the application of UAVtechnology remains potential. This paper presents a low-cost unmannedaerial vehicle te...

The paper is devoted to studying the possibility of using artificial neural networks (ANN) to estimate ground subsidence caused by underground mining. The experiments showed that the most suitable network structure is a network with three layers of perceptrons and four neurons in the hidden layer with the back propagation algorithm (BP) as a traini...

In processing of position time series of crustal deformation monitoring stations by continuous GNSS station, it is very important to determine the motion model to accurately determine the displacement velocity and other movements in the time series. This paper proposes (1) the general geometric model for analyzing GNSS position time series, includi...

LiDAR technology has been widely adopted as a proper method for land cover classification. Recently with the development of technology, LiDAR systems can now capture high-resolution multispectral bands images with high-density LiDAR point cloud simultaneously. Therefore, it opens new opportunities for more precise automatic land-use classification...

Vietnam's mining industry has a long history with mines distributed throughout the country. It has contributed significantly to national economic growth. However, it also causes negative impacts on the environment, thereby affecting sustainable development and mineral resource management. Therefore, mineral resource management is one of the most cr...

To evaluate the accuracy of the digital surface model (DSM) of an open-pit mine produced using photos captured by the unmanned aerial vehicle equipped with the post-processing dynamic satellite positioning technology (UAV/PPK), a DSM model of the Deo Nai open-pit coal mine was built in two cases: (1) only using images taken from UAV/PPK and (2) usi...

Mining-induced subsidence is often determined by field survey methods, e.g., using total station or global navigation satellite system (GNSS) technology. The advantage of these methods is high accuracy, but they are usually employed in a small-scale areas. Radar technology has been developed and applied to determine surface subsidence over a large...

Flood hazard zoning is an important problem that has received much attention from environmental researchers. This problem requires complex spatial analysis; hence, numerous criteria have to be assessed. Factors contributing to the flood formation includes both natural and socioeconomic ones. However, the central question is what factors are importa...

Mapping flood hazard becomes a basic and crucial requirement to cope with and to mitigate flood risks. However, it is a big challenge to accurately construct a flood hazard map in the large and sparsity data basin. Here, we present a new approach to make a flood hazard map in a large and complex river basin with data sparsity based on a comprehensi...

Interferometric synthetic aperture radar (InSAR), one of the most commonly used remote sensing methods for observing and monitoring land subsidence, has been applied in Hanoi, Vietnam in several studies with results showing deformation up to 2014. However, freely accessible Sentinel-1 InSAR data have not been investigated thoroughly to date. Here,...

Understanding the surface topography is very essential for numerous Earth science applications and national infrastructure projects. With the advent of the satellite era, there have been numerous Digital Height Models (DHMs) available in the public domain. We use here the term DHM that includes discussions on both Digital Elevation Model (DEM) and...

Open-pit mining activities, including blasting, drilling, loading, and transport, often result in the direct emission of particulates and gases into the atmosphere. Occupational exposure to these pollutants is considered as the risk for health, especially the risk of developing respiratory diseases. An air quality monitoring system and spatial anal...

Mining activities can cause mining hazards, among them land subsidence occurring in mine areas and their vicinities. Mining-induced surface subsidence is often quantified by traditional geodetic surveying with an advantage of high accuracy, but it is usually applied in small areas. With the development of radar technology, there have been many stud...

Along with the development of open-pit mining operation, mining geomatic engineering have been on the go for years playing an important role in periods of designing, building, operating, closing and environmental monitoring. The application of modern geomatic technologies has been improving the efficiency of the management and operations in open-pi...

Vietnam has abundant and diversified mineral resources with more than 5, 000 mines of 60 discovered and exploited minerals. Besides of surface coal mines mainly located in Quang Ninh, the types of minerals being exploited by surface mining method consist of metal ores (iron, titanium, manganese, gold, zinc, copper, antimony) and non - metallic ores...

Open-pit coal mines’ terrain is often complex and quickly and frequently changes. Therefore, topographic surveys of open-pit mines are undertaken on a daily basis. While these tasks are very time-consuming and costly with traditional methods such as total station and GNSS, the unmanned aerial vehicle (UAV) based method can be more efficient. This m...

Air quality in the mining industry is a severe environmental issue associated with many health problems. Managing air quality in mining areas has faced many challenges due to the lack of understanding of the climatic factors and physical removal mechanisms of gas contaminants. In order to study the effects of the atmospheric conditions on the pit p...

In addition to the five main factors affecting the formation of floods including slope, rainfall, drainage density, soil, and land cover, the relative slope length factor has also been considered to be one of the fundamental causes that contribute to flood hazard. The paper analyzes the theoretical basis for choosing the relative slope length crite...

Investigating information on land cover changes is an indispensable task in studies related to the variationof the environment. Land cover changes can be monitored using multi-temporal satellite images at different scales. Thecommonly used method is the post-classification change detection which can figure out the replacement of a land coverby the...

Lightweight Unmanned Aerial Vehicle (UAV) for 3D topographic mapping in mining industry has been raised significantly in recent years. Especially, in complex terrains such as in open-pit mines in which the elevation is rapidly undulating, UAV-based mapping has proven its economical efficiency and higher safety compared to the conventional methods....

Image data from Drones/Unmanned Aerial Vehicles (UAVs) has been studied and used extensively for establishing maps. The process of UAV data provides three main products including (Digital Surface Model) DSM, Point cloud and Ortho-photos, in which point cloud is a valuable data source in building 3D models and topographic surfaces as well. However,...

Bài báo trình bày kết quả ứng dụng thiết bị bay không người lái (UAV) kinh phí thấp trong công tác đo đạc thành lập mô hình số độ cao (DEM) phục vụ tính toán kiểm kê trữ lượng khai mỏ. Trong nghiên cứu này, thiết bị bay Phantom 4 pro đã được sử dụng để bay chụp bề mặt địa hình mỏ đá Tuf-Andezit, huyện Tri Tôn, tỉnh An Giang. DEM được thành lập từ ả...

In this paper, we proposed a novel approach for estimating preliminary values of parameters of the Asadi profiling function (APF), then the least-squares principle was used with these preliminary values and ground subsidence monitoring data at the Thong Nhat underground mine to determine to the final parameters of the APF. This function was employe...

Flash floods induced by torrential rainfalls are considered one of the most dangerous natural hazards, due to their sudden occurrence and high magnitudes, which may cause huge damage to people and properties. This study proposed a novel modeling approach for spatial prediction of flash floods based on the tree intelligence-based CHAID (Chi-square A...

The paper presents the assessment of the maximum magnitude of natural and triggered earthquakes when water is impounded to 130m in the mining pit for the landscaped lake in the Nui Nho quarry in Di An commune, Binh Duong province, Vietnam. The maximum magnitudes of the natural and triggered earthquakes were estimated by using artificial neural netw...

The principal object of this study is blast-induced ground vibration (PPV), which is one of the dangerous side effects of blasting operations in an open-pit mine. In this study, nine artificial neural networks (ANN) models were developed to predict blast-induced PPV in Nui Beo open-pit coal mine, Vietnam. Multiple linear regression and the United S...

Air overpressure (AOp) is one of the products of blasting operations in open-pit mines which have a great impact on the environment and public health. It can be dangerous for the lungs, brain, hearing and the other human senses. In addition, the impact on the surrounding environment such as the vibration of buildings, break the glass door systems a...

Aerosol optical depth (AOD) can be retrieved accurately with sequential ground-based measurements of direct and diffuse solar radiance. However, spatial coverage and location frequency cause certain limitations. Hence, satellite image data are a proper tool for obtaining aerosol optical depth products with more spatial information and patterns of a...

This paper presents the GIS approach application methodology for analyzing the transformation of Agricultural Cooperativesunder the Vietnam Cooperative Law 2012. Through the survey data at 90 cooperatives at 9 provinces in 7 economic regions ofVietnam, which can assess the level of the transformed successful group, transformed not successful group...

Predicting and reducing blast-induced ground vibrations is a common concern among engineers and mining enterprises. Dealing with these vibrations is a challenging issue as they may result in the instability of the surrounding structures, highways, water pipes, railways, and residential areas. In this study, the effects of blasting in a quarry mine...

In this scientific report, a new technique of artificial intelligence which is based on k-nearest neighbors (KNN) and particle swarm optimization (PSO), named as PSO-KNN, was developed and proposed for estimating blast-induced ground vibration (PPV). In the proposed PSO-KNN, the hyper-parameters of the KNN were searched and optimized by the PSO. Ac...

The open-cast and underground mine maps are generally estab-lished by conventional surveys like total stations; however, the low point density often results in low accuracy maps. That is why in this study, terrestrial laser scanning (TLS) was performed to make high definition maps. The objective of this study is to assess the practicability of appl...

Dust is one of the components causing heavy environmental pollution in open-pit mines, especially PM 10. Some pathologies related to the lung, respiratory system, and occupational diseases have been identified due to the effects of PM 10 in open-pit mines. Therefore, the prediction and control of PM 10 concentration in the production process are ne...

The principal object of this study is blast-induced ground vibration (PPV), which is one of the dangerous side effects of blasting operations in an open-pit mine. In this study, nine artificial neural networks (ANN) models were developed to predict blast-induced PPV in Nui Beo open-pit coal mine, Vietnam. Multiple linear regression and the United S...

ir overpressure (AOp) is one of the products of blasting operations in open-pit mines which have a great impact on the environment and public health. It can be dangerous for the lungs, brain, hearing and the other human senses. In addition, the impact on the surrounding environment such as the vibration of buildings, break the glass door systems ar...

Sách chuyên khảo “Quét laser mặt đất - công nghệ địa không gian trong công nghiệp khoáng sản” là kết quả tổng hợp kiến thức lý thuyết và kinh nghiệm thực tiễn trong nhiều năm giảng dạy, nghiên cứu khoa học và triển khai công nghệ của các cán bộ giảng dạy bộ môn Trắc địa mỏ Trường Đại học Mỏ-Địa chất, Hà Nội. Sách là tài liệu học tập cho sinh viên c...

Observation lines set up on the ground play an important role in the determination of rock deformation caused by underground mining, issuing timely warning notices and alleviating any impacts on surface engineering constructions. The main purpose of this study is to design three monitoring lines above the working (tunnel) with exact location of obs...

Global Navigation Satellite System (GNSS) has been widely used in the field of surveying. When applying the GNSS technology, the positioning could be done by setting up a network of continuous operation reference stations (CORS). Real Time Kinematic (RTK) method based on CORS stations, therefore, has been developed. While the accuracy of positionin...

Surface subsidence due to underground mining is a frequent problem that mine surveyors normally deal with. When some indicators like ground cracks occur, it is necessary to have a quick assessment of surface subsidence. In this case, the similar zone method proposed by D. A. Kagacovski is commonly used. By this method, the borehole data of overburd...

UAV photogrammetry technology has been an increasingly common solution for producing digital surface models (DSM). However, this is still a quite new technology at open-pit mines in Vietnam. The main purpose of this paper is to comprehensively assess the ability of the UAV-based technology in DSM and map production. In order to achieve this goal, a...

The objective of this study is to assess the surface subsidence due to mining activities at a study site in Upper Silesia Region (Poland). For this purpose, the geodetic time-series monitoring data was used from the period of 3 years (2009–2012). Knothe-Budryk theory was adopted for the influence of underground mining on the subsidence and inclina...

Knothe-Budryk theory was adopted for the influence of underground mining on the subsidence and inclination whereas the rigid body condition method was used to evaluate the stable of buildings. The final inclination values, computed from the rigid body method, are few times bigger than the prediction of the Knothe-Budryk theory. Therefore, we conclu...

Recent technological innovations have led to the available of lightweight Unmanned Aerial Vehicle (UAV) and Structure-from-Motion (SfM) photogrammetry that are successfully applied for 3D topographic surveys. However, application of UAV and SfM for complex topographic areas i.e. open-pit mine areas is still poorly understood. This paper aims to inv...

The main aim of this research is to propose and evaluate a new hybrid intelligent approach (namely LSSVM-FA) based on Least Squared Support Vector Machines (LSSVM) and Firefly algorithm (FA) for flood susceptible modeling with a case study at a typical flood region in Central Vietnam. LSSVM and FA are current state-of-the art machine learning techn...

Slope failure of open pit mines in Vietnam have occurred rather frequently, causing many economical and technical problems. The reason is improper design of pit slope parameters due to lack of understanding of the slopes. To solve the problem, it is needed to conduct study and analyzing stability of pit slopes with right and modern scientific metho...

Hanoi University of Mining and Geology (HUMG) and the International Society for Mine Surveying (ISM) organize the International Conference on Geo-spatial Technologies and Earth Resources in Hanoi, Vietnam, from 5th to 6th October 2017 (GTER 2017). The conference is to mark the 50th anniversary of the Vietnam mine surveying education (1967-2017), th...

Bài báo sử dụng mô hình địa cơ nhằm phân tích, dự báo các yếu tố ảnh hưởng đến dịch chuyển biến dạng đất đá trong mối tương quan với góc dốc vỉa, độ sâu và hệ thống khai thác. Mô hình số địa cơ cho phép nghiên cứu các bài toán có tính đến đặc điểm phân lớp (không đồng nhất, không đẳng hướng của khối đá). Các quy luật nhận được về phân bố ứng suất,...

The main objective of this study is to assess and predict the surface subsidence at the Mong Duong coal mine, Quang Ninh province of Vietnam due to mining activities. For this purpose, a monitoring network for the site was established, and then, the land subsidence data were obtained during the period from 2013 to 2015 with twelve cycles. Two cases...

During the last several years, the problem of mining damage on the Quang Ninh coalfi eld has become more and more serious. Some methods of prediction theories have been applied including the Budryk-Knothe’s infection function one. This article presents the analysis and comparison of predicted result and monitored subsidence indicators for case stud...

Global Navigation Satellite System (GNSS) has opened a new era for surveying and mapping, especially for mine surveying. GNSS has changed conceptualization and methodology of positioning for points on the ground due to its advantages. The changes of the GNSS system such as multi-system, development of support systems, receivers, software, and new m...

Quá trình dịch chuyển và biến dạng bề mặt do tác động của quá trình khai thác mỏ bằng phương pháp hầm lò chịu ảnh hưởng của nhiều yếu tố khác nhau, trong đó công nghệ - khai thác là yếu tố tác động manh mẽ tới phạm vi, tính chất và quy luật của quá trình dịch chuyển. Bài báo hệ thống hóa các yếu tố công nghệ - khai thác tác động tới biến dạng bề mặ...

Quyển từ điển nhằm cung cấp cho các giảng viên, NCS, học viên cao học, sinh viên đại học của Trường Đại học Mỏ - Địa chất, các kỹ sư mỏ, các nhà môi trường, các cơ quan quản lý nhà nước trong lĩnh vực mỏ và môi trường,... các từ và thuật ngữ Anh - Việt thuộc ngành Mỏ và Môi trường. Ngoài ra, quyển sách cũng cung cấp những từ và thuật ngữ cơ bản của...