İsmail Şanlıoğlu İsmail Şanlıoğlu MÜHENDİSLİK FAKÜLTESİ HARİTA MÜHENDİSLİĞİ BÖLÜMÜ HARİTA MÜHENDİSLİĞİ ANABİLİM DALI
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Investigation of landslide detection using radial basis functions: a case study of the Taşkent landslide, Turkey

Şanlıoğlu, İsmail

This paper investigates landslide detection over flat and steep-slope areas with large forest cover using different radial basis function interpolation methods, which can affect the quality of a digital elevation model. Unmanned aerial vehicles have been widely used in landslide detection studies. The generation of image-based point clouds is achievable with various matching algorithms from computer vision systems. Point cloud-based analysis was performed by generating multi-temporal digital elevation models to detect landslide displacement. Interpolation methodology has a crucial task to fill the gaps in insufficient areas that result from filtered areas or sensors that do not generate spatial information. Radial basis function interpolations are the most commonly used technique for estimating the unknown values in survey areas. However, the quality of the radial basis function interpolation methods for landslide studies has not been thoroughly investigated in previous studies. In this study, radial basis function interpolation methods are investigated and compared with the global navigational satellite systems, which provide high accuracy for geodetic measurement systems. The main purpose of this study was to investigate the various radial basis function models to detect landsl...

Assessment of changes in masseter muscle by three-dimensional close-range photogrammetry after Botulinum toxin type-A injection: A case report with review of literatüre

Şanlıoğlu, İsmail

Masseter muscle hypertrophy (MMH) is a benign, unilateral or bilateral, painless enlargement. Treatment protocols include surgical excision or a non-invasive option, using botulinum toxin type A (BTX-A). There is no study in the literature that measures this dimensional change in the masseter muscle (MM). The aim of this case report is to present changes in volume and surface area in MM with three-dimensional closer an gestereophotogrammetry (3DCS). For treatment 30 units of BTX-A was injected into the three points hypertrophic muscle and patient records were taken to compare with 3DCS with a non-metric Canon EOS 550 D camera before and after injection. The changes in the surface area and volume of this muscle were mapped and the objective data were obtained. This technique is useful for predicting the results of BTX-A application, and can be a useful tool for better physicianpatient communication.

Point cloud filtering on UAV based point cloud

Şanlıoğlu, İsmail

Nowadays, Unmanned Aerial Vehicles (UAVs) have been attracted wide attentions such as a new measurement equipment and mapping, which are capable of the high-resolution point cloud data collection. In addition, a massive point cloud data has brought about the data filtering and irregular data organization for the generation of digital terrain models. Filtering of point clouds contains vegetations and artificial objects play a crucial role for bare earth terrain modelling. Topographical maps rely on the data structures which are built on bare ground terrain points. The bare earth surface extraction is not the only crucial to the topographical maps but also decision-making processes such as natural hazards management, deformation analysis and interpretation. In order to filter a UAV-based 3D raw point cloud data, in this paper, filtering performance of four different algorithms using open source and commercial software's have been investigated, (1) curvature based (Multiscale Curvature Classification-MCC), (2) surface-based filtering (FUSION), (3) progressive TIN based (LasTool-LasGround module-commercial) and (4) physical simulation processing (Cloth Simulation Filtering-CSF). The applied filtering results were validated with the reference data set classified by operator. Although ...

Open Geospatıal Consortıum Web Map And Feature Servıces And Free/Open Source Server/Clıent Softwares

Şanlıoğlu, İsmail

Usage of geospatial data enables decisions to be more effective and stronger in critical fields. Since geospatial data is very expensive source and the most time-consuming step, mostly it is not possible to find the required data ready to use. Therefore different projects have been developed and tried to implement by several countries to keep geospatial data which is required to collect and managed, accessible and usable. At this study Open Geospatial Consortium standarts were explained, the focus was given on WFS and WMS because of their increasing popularity. Concurrently free and/or open source WMS/WFS server and client softwares were investigated.

Monitoring landslides with geophysical and geodetic observations

Şanlıoğlu, İsmail

The objective of this study was to evaluate and predict land movement by integrating geodetic, geophysical and meteorological data in a landslide area. Specifically, electrical resistivity tomography surveying, Global Navigation Satellite System and terrestrial laser scanning techniques were integrated to monitor a landslide. The study area lies to the southeast of the town of Ta kent in southern Turkey, close to Balcflar in the Central Taurus mountain chain. Landslides result in considerable damage to structures, farmland and the environment in this area; therefore, it is important to characterise the size, extent and timing of past land movements in order to mitigate damage from future landslides. Analysis presented in this paper shows that the greatest land movements in the region occur in spring, when average motions can be up to 1.5 m per month. It is demonstrated that integrated techniques provide a better means for monitoring landslide processes and gathering data for predictions of future movements. Mapping landslide movements by integrating geophysical and geodetic observations can provide a meaningful evaluation of a landslide and its dynamics.

Accurate determination of the Taşkent (Konya, Turkey) landslide using a long-range terrestrial laser scanner

Şanlıoğlu, İsmail

Landslides are a common type of mass movement that occur in large numbers and have significant effects on topography. In Turkey, landslides rank second after earthquakes among natural disasters that cause widespread loss of life and property. This study investigates the monitoring of the Tas¸kent Landslide (Konya, Turkey), which has considerably affected the local topography. The landslide in Tas¸kent had an adverse effect on transportation to nearby towns and villages. Initial studies were conducted using the global navigation satellite system (GNSS) measurement scale; these studies are currently ongoing. Since 2011, studies using terrestrial laser scanning (TLS), which is one of the latest ground-positioning technologies, have also been launched. This article presents the results of the TLS and GNSS approaches used to monitor, characterise and model an active landslide. It includes the comparison and analysis of a point cloud, three-dimensional model, profile and change in volume mass acquired in different time periods in one landslide area. The point cloud data, obtained from two different time periods using the TLS technique, and supported by the results of GNSS analysis, were analysed via different methods. The TLS revealed that up to 4 m of material was displaced at the sit...

Photogrammetric Survey And 3d Modeling of İvriz Rock Relief In Late Hittite Era

Şanlıoğlu, İsmail

In this study, the photogrammetric measurement technique was used to document the Ivriz relief, which is located under the Kocaburun Rock on Mount Aydos in the village of Ivriz (Aydinkent), Konya-Eregli. This relief has been standing since B.C. 720 but suffers from man and environmental agents. It has been standing high from ground on rock facade. Therefore a 3D (three-dimensional) model of the monument was obtained as a result of the work conducted for protection. Conservation has been done by close-range photogrammetry technique. Using close-range photogrammetry, in which only some brief field work was done with a majority of the other work being conducted in an office, documentation can be efficiently performed using free equipment and software as well as scaled archives to produce three-dimensional models of historical and cultural heritages in a digital environment.

Design And Testing of A Web-Based Automatic High Precision GPS Data Processing Environment

Şanlıoğlu, İsmail

While GPS (Global Positioning System) has been in daily life in form a navigation tool for nearly three decades, its applications have been matured to provide valuable information for a wide range of areas requiring very high precision such as geophysical and seismological studies, earthquake prediction, deformation monitoring. High-precision GPS data processing requires incorporating elaborate models of numerous physical phenomena such as ocean loading, solid earth tides, troposphere and ionosphere modeling, water-vapor modeling, robust phase ambiguity resolution. Commercial software has limited applications and often lacks such fine and complex modeling capabilities which are usually developed and applied in research institutes and universities. The academic software developed in universities and research institutes are generally highly complicated lacking a user-friendly environment and an easy learning curve. On the other hand, today’s engineering requirements is constantly increasing and more precise GPS data processing methods are needed. In this study, we present a web-based approach to high precision GPS data processing which integrates the complex data modeling methods in the server side with the user-friendly interface in the client side. A complete application was also...

Scaling of EDM calibration baselines by GPS and controlling of EDM parameters

Şanlıoğlu, İsmail

The calibration values of electromagnetic distance measurements, which have been given by their own firms, can lose their currency in time. So, the EDMs must be controlled in the particular time intervals. The EDM controls have been usually made in the EDM calibration baselines, which are constituted for this aim. Zero addition, scale coefficient and phase difference measurement function constitute the measurement function as a result of control done. The EDM calibration baseline must be scaled to determine the scale coefficient. Not only high accuracy instruments as Kern Mekometer 3000 but also GPS can be used for scaling. In this study, it has been investigated that possibility of scaling of EDM calibration baseline by using GPS and the scaled EDM calibration baseline, and the calibration parameters of Sokkisha SET2, Topcon GTS701, Topcon GTS 229 and Sokkia Power SET 2000 electronic tacheometers have also been estimated.