Bashar Alsadik

Bashar Alsadik
University of Twente | UT · Department of Earth Observation Science (EOS)

PhD
Geospatial UAV Center in the ITC faculty offers: Educational courses, Tailor-made courses, Research, and Consultancy.

About

62
Publications
22,305
Reads
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313
Citations
Introduction
Bashar is an assistant professor of photogrammetry at the ITC faculty-University of Twente. His work focuses on research related to AEC industry and built environment, teaching, and capacity development or tailor made projects. Several topics related to geospatial engineering and earth observation science are of his interest, especially UAV photogrammetry, mobile mapping systems, 3D modeling, etc.
Additional affiliations
December 2019 - present
University of Twente
Position
  • Professor (Assistant)
March 2015 - December 2019
CycloMedia Technology
Position
  • Engineer
April 1999 - November 2014
University of Baghdad
Position
  • Professor (Assistant)
Education
November 2010 - November 2014
University of Twente
Field of study
  • ITC - EOS - TOPMAP
September 1992 - March 1995
University of Baghdad
Field of study
  • Surveying Engineering
June 1988 - June 1992
University of Baghdad
Field of study
  • Surveying Engineering

Publications

Publications (62)
Conference Paper
Full-text available
The ongoing development of advanced techniques in photogrammetry, computer vision (CV), robotics and laser scanning to efficiently acquire three dimensional geometric data offer new possibilities for many applications. The output of these techniques in the digital form is often a sparse or dense point cloud describing the 3D shape of an object. Vie...
Article
Full-text available
3D modeling of cultural heritage objects like artifacts, statues and buildings is nowadays an important tool for virtual museums, preservation and restoration. In this paper, we introduce a method to automatically design a minimal imaging network for the 3D modeling of cultural heritage objects. This becomes important for reducing the image capture...
Article
Full-text available
Image-based modeling is an appropriate technique to create 3D models of cultural heritage objects, which starts with the basic task of designing the camera network. This task is, however, quite crucial in practical applications because it needs a thorough planning and a certain level of experience. The optimal camera network is designed when certai...
Article
Full-text available
Cultural heritage documentation and monitoring represents one of the major tasks for experts in the field of surveying, photogrammetry and geospatial engineering. Cultural heritage objects in countries like Iraq and Syria have suffered from intentional destruction or demolition during the last few years. Furthermore, many heritage sites in the ment...
Article
Full-text available
Mobile mapping systems (MMS) are widely used technology nowadays for spatial data collection of large scale projects like for city and highway mapping. The systems are mainly equipped with laser scanning sensors and/or imaging sensors mounted on a moving vehicle during the scene capture. Imaging sensors are normally cameras which either capture per...
Article
Full-text available
Stereo image orientation is one of the major topics in computer vision, photogrammetry, and robotics. The stereo vision problem solution represents the basic element of the multi-view Structure from Motion SfM in computer vision and photogrammetry.A successfully reconstructed stereo image geometry is based on solving the epipolar constraint using t...
Article
Full-text available
Mapping systems using multi-beam LiDARs are widely used nowadays for different geospatial applications graduating from indoor projects to outdoor city-wide projects. These mobile mapping systems can be either ground-based or aerial-based systems and are mostly equipped with inertial navigation systems INS. The Velodyne HDL-32 LiDAR is a well-known...
Article
The coregistration of terrestrial laser point clouds is widely investigated where different techniques are presented to solve this problem. The techniques are divided either as target-based or targetless approaches for coarse and fine coregistration. The targetless approach is more challenging since no physical reference targets are placed in the f...
Article
Full-text available
Ongoing developments in video resolution either using consumer-grade or professional cameras has opened opportunities for different applications such as in sports events broadcasting and digital cinematography. In the field of geoinformation science and photogrammetry, image-based 3D city modeling is expected to benefit from this technology develop...
Data
supplementary data of paper: Potential Use of Drone Ultra-High-Definition Videos for Detailed 3D City Modeling.
Article
Full-text available
Positioning is a need for many applications related to mapping and navigation either in civilian or military domains. The significant developments in satellite-based techniques, sensors, telecommunications, computer hardware and software, image processing, etc. positively influenced to solve the positioning problem efficiently and instantaneously....
Article
Full-text available
The increasing development and production of unmanned aerial vehicles (UAVs or ‘drones’) with a higher level of autonomy can reduce human error and assist in safer, faster and more accurate inspections. Thanks to their ability to perform repeated inspections, even in challenging and dynamic environments, they make it easier to monitor infrastructur...
Article
The coregistration of terrestrial laser point clouds is widely investigated where different techniques are presented to solve this problem. The techniques are divided either as target-based or targetless approaches for coarse and fine coregistration. The targetless approach is more challenging since no physical reference targets are placed in the f...
Article
Full-text available
Heritage at risk is a terminology used to describe the sites that are highly at risk of being lost as a result of intentional demolition, deterioration, negligence or subject to improper preservation or mistreatment. Iraq is one of the countries that suffered in the last decade from intentional demolition of highly valuable heritage sites and objec...
Article
Full-text available
In mobile mapping, geospatial data is acquired by one or more cameras and/or one or more Lidar sensors mounted on a vehicle that moves over land, through water or through the air. The distribution of Lidar beams over the scene may be realized by a spinning mirror or by a solid-state device. Multiple beams may be emitted simultaneously, and single o...
Data
A 3D model of Taq-Kasra site created from Drone videos.
Data
3D model created from drone images
Article
Full-text available
Mobile mapping systems MMS equipped with cameras and laser scanners are widely used nowadays for different geospatial applications with centimetric accuracy either in project wise or national wise scales. The achieved positioning accuracy is very much related to the navigation unit, namely the GNSS and IMU onboard. Accordingly, in GNSS denied and d...
Article
Full-text available
In the last two decades, unmanned aircraft systems (UAS) were successfully used in different environments for diverse applications like territorial mapping, heritage 3D documentation, as built surveys, construction monitoring, solar panel placement and assessment, road inspections, etc. These applications were correlated to the onboard sensors like...
Article
Full-text available
Lidar technology is thriving nowadays for different applications mainly for autonomous navigation, mapping, and smart city technology. Lidars vary in different aspects and can be: multi beam, single beam, spinning, solid state, full 360 field of view FOV, single or multi pulse returns, and many other geometric and radiometric aspects. Users and dev...
Conference Paper
Full-text available
Three-dimensional (3D) building model is gaining more scientific attention in recent times due to its application in various fields such as vehicle autonomous navigation, urban planning, heritage building documentation, gaming visualisation and tourism. The quality of the Level of Detail (LoD) of building models relies on the high-resolution data s...
Book
Full-text available
Adjustment Models in 3D Geomatics and Computational Geophysics: With MATLAB Examples introduces a complete package of theoretical and practical subjects in adjustment computations related to Geomatics and geophysical applications, particularly photogrammetry, surveying, remote sensing, GIS, cartography, and geodesy. Supported by illustrating figure...
Article
Full-text available
Nowadays, there is a huge research work and literature about the use of laser scanning, computer vision and photogrammetry to turn cultural heritage objects into 3D digital models. These developed 3D models are used for cultural heritage documentation, conservation, restoration and virtual reality applications. Many 3D digital models of cultural he...
Preprint
An application is presented in this paper to an important technique of least square (LS) adjustment using the unified approach. The unified approach is considering the contribution of weights to unknown parameters in a Geomatics model similar to observations. Accordingly, the adjusted parameters are governed by their assigned a priori weights which...
Book
Nowadays, maps represent a very useful tool which we often use in our daily life. Maps can be represented in two dimensions (2D) or in three dimensions (3D) either hard-printed or in digital form. Currently, 3D digital maps can be represented as point clouds or triangulated mesh surfaces and in most cases have a reality based texture. Further, the...
Conference Paper
Full-text available
The ongoing technical improvements in photogrammetry, Geomatics, computer vision (CV), and robotics offer new possibilities for many applications requiring efficient acquisition of three-dimensional data. Image orientation is one of these important techniques in many applications like mapping, precise measurements, 3D modeling and navigation. Imag...
Article
Full-text available
The ongoing technical improvements in photogrammetry, Geomatics, computer vision (CV), and robotics offer new possibilities for many applications requiring efficient acquisition of three-dimensional data. Image orientation is one of these important techniques in many applications like mapping, precise measurements, 3D modeling and navigation. Ima...
Article
Full-text available
Presently, the techniques of automated image-based modelling and camera technology are an efficient tool for cultural heritage documentation and preservation. One option is to use high-resolution video imaging to have 3D models of architectures, statues and monuments. Video imaging is a preferred choice when compared to still image shooting in mode...
Conference Paper
Full-text available
Currently, there is a rapid development in the techniques of the automated image based modelling (IBM), especially in advanced structure-from-motion (SFM) and dense image matching methods, and camera technology. One possibility is to use video imaging to create 3D reality based models of cultural heritage architectures and monuments. Practically, v...
Code
Bundle adjustment - normal equation simulator and plotter for educational purpose.
Thesis
Full-text available
Image-based modelling techniques are important for producing 3D models in a practical and cost effective manner. This modelling starts with designing the camera network for the study object. This task is, however, quite crucial in practical applications because it needs a thorough planning and a certain level of experience. The optimal camera netwo...
Data
Full-text available
Data
Full-text available
Data
Full-text available
COSCH meeting March 27, Mainz Abstract for WG 3: Algorithms and procedures
Conference Paper
Full-text available
ABSTRACT: Image-based modeling techniques are an important tool for producing 3D models in a practical and cost effective manner. Accurate image-based models can be created as long as one can retrieve precise image calibration and orientation information which is nowadays performed automatically in computer vision and photogrammetry. The first step...
Presentation
Full-text available
Master of Science course - 3D GEOINFORMATION FROM IMAGES SIFT: SCALE INVARIANT FEATURE TRANSFORM SURF: SPEEDED UP ROBUST FEATURES
Conference Paper
Full-text available
Digital cultural heritage documentation in 3D is subject to research and practical applications nowadays. Image-based modeling is a technique to create 3D models, which starts with the basic task of designing the camera network. This task is – however – quite crucial in practical applications because it needs a thorough planning and a certain level...
Article
Full-text available
This paper compares between the direct and indirect georeferencing techniques in Photogrammetry bases on a simulation model. A flight plan is designed which consists of three strips with nine overlapped images for each strip by a (Canon 500D) digital camera with a resolution of 15 Mega Pixels. The triangulation computations are carried out by using...
Article
Full-text available
The modern analysis techniques for monitoring the deformation of concrete structures like Mosul dam depends on the assumption of a free geodetic network, without control points, then to carry out the adjustment for the networks according to the complex adjustment techniques of Least Squares, and the generalized inverse. Displacement after applying...
Book
Adjustment computations of observations in surveying (Geomatics) written in Arabic language as a curriculum studying book for the department of surveying - college of engineering at Baghdad university in Iraq.
Article
Full-text available
A new mathematical model for solving the problem of land grading has been presented in this research de-pending upon two dimensional interpolation models of linear least square LLS and inverse distance weight (IDW). The problem to be solved required the solution to be accomplished by nonlinear programming optimization. The volume computation by the...
Article
A new mathematical model for solving the problem of land grading has been presented in this research de-pending upon two dimensional interpolation models of linear least square LLS and inverse distance weight (IDW). The problem to be solved required the solution to be accomplished by nonlinear programming optimization. The volume computation by the...
Article
In adjustment of geodetic and photogrammetric networks, the surveying engineer faces many problems, such as errors of blunder nature in the observations (when comparing the homogeny of precision) make these observations odd from the result, and effecting directly on observation values after adjustment, and the statistical results after analysis as,...
Article
In adjustment of geodetic and photogrammetric networks, the surveying engineer faces many problems, such as errors of blunder nature in the observations (when comparing the homogeny of precision) make these observations odd from the result, and effecting directly on observation values after adjustment, and the statistical results after analysis as,...

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Projects

Projects (5)
Project
The objective of this research is to find an efficient and applicable registration method to co-register LiDAR data (trajectories and point clouds) and image data (camera poses and point clouds) simultaneously acquired with a hybrid UAS system.
Project
We would like to gather/archive all the scientific published work applied by the Iraqi researchers in the field of surveying and geospatial engineering. The work content should be related to Iraq.
Archived project
Semi-automatic use of captured smartphone images for positioning applications in special projects by integrating with panoramic street images.