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Publications (24)
Road networks are crucial to urban infrastructure and significantly affect transportation, traffic management, and emergency response. Besides, accurate mapping is essential for detecting road networks effectively, but traditional methods like manual digitization and field surveys often struggle in fast-changing urban environments. Remote sensing a...
Global warming phenomena lead to melting glaciers, rising sea levels, droughts, and irregular seasonal patterns, especially in polar regions. Besides, water vapor plays a significant role in these processes, contributing to about 60% of the natural greenhouse effect. Increasing temperature raises the atmosphere's capacity for water vapor, creating...
This study evaluates the performance of multi-constellation GNSS Precise Point Positioning (PPP) for offshore kinematic observations in the challenging environment of Antarctica using the data collected on a moving ship during the 6th Turkish Antarctic Expedition in 2022. The analysis involved two open-source PPP software solutions, PRIDE PPP-AR, a...
In this study, the static and kinematic positioning performance of the Garmin GPSMAP 66sr handheld GNSS receiver has been tested. For the static test, GNSS data was collected for 24 h and divided into shorter sessions of 1, 2, and 4 h to assess the performance of the receiver as a function of occupation time. The whole and subgroup data were proces...
Galileo, the Europe’s Global Navigation Satellite System (GNSS), provides a global real-time PPP service with its High Accuracy Service (HAS) that became operational in early 2023. The objective of this study was to assess the kinematic real-time PPP accuracy performance provided by the Galileo HAS satellite-based correction system. Within this fra...
Meteorological events in the troposphere, which is the lowest layer of the atmosphere, affect GNSS signals and delay the signals from reaching the Earth's surface. The precipitable water vapor (PWV) value calculated as a function of these tropospheric delay values is an indicator of the potential precipitation information that will emerge. Consider...
In this study, the static and kinematic positioning performance of the Garmin GPSMAP 66sr handheld GNSS receiver has been tested. For the static test, GNSS data was collected for 24 hours and divided into shorter sessions of 1, 2, and 4 hours to assess the performance of the receiver as a function of occupation time. The whole and subgroup data wer...
As a result of advances in technologies, the raw GNSS measurement (i.e., pseudorange, phase, and Doppler) can now be collected with smartphones, tablet computers, and handheld GNSS receivers/chipsets. The most important milestone in this field was undoubtedly Google’s announcement in May 2016 that devices with Android Nougat v.7.x and higher operat...
The polar regions, which include the Arctic and Antarctic areas, attract the attention of people every day, and issues that are
closely related to the future of humanity make these regions even more important. Accurate and reliable positioning in polar regions
is very critical for scientific research projects and also for commercial, touristic, and...
The international service that ensures access to data and products of global navigation satellite systems (GNSSs), known as the IGS, runs a real-time service (RTS) project to support users who need real-time access to precise products. Thanks to the RTS project, it is now possible to obtain real-time precise point positioning (RT-PPP) solutions. RT...
The use of the Precise Point Positioning (PPP) technique has become very advantageous with the development of GNSS positioning technology. It is possible to get highly accurate position information without the need of any reference station data using the PPP technique. However, there are various factors that affect the accuracy of PPP solutions, in...
In this article, the usability and accuracy assessment of the real-time Precise Point Positioning (PPP) technique for dynamic positioning in application areas with difficult atmospheric and topographic conditions, such as polar regions, has been investigated. Within this frame, kinematic Global Navigation Satellite System (GNSS) data collected duri...
In both Antarctic and Arctic regions, human activities for social and scientific purposes are increasing day by day, and studies are carried out for different purposes including mapping, glacial and coastal erosion monitoring, marine survey, remote sensing, tectonic climate change monitoring, atmospheric monitoring, mining, tourism, fisheries, biol...
The Single-baseline Real-time Kinematic method was used in applications where real-time high accurate positioning is required. Studies carried out to eliminate some of the limitations in this method have brought up the idea of adding real-time positioning feature to Continuously Operating Reference Stations, thus Network-RTK (Network-RTK) method ha...
In this study, the usability and accuracy performance of the multi-GNSS kinematic real-time Precise Point Positioning (RT-PPP) technique in Antarctica, which has extreme atmospheric and topographic conditions, was investigated. In this context, the two-day GNSS dataset of the OHI300ATA reference station, which is a member of the IGS MGEX-RTS statio...
Bu çalışmada, 30 ülkenin 100 civarında bilim üssünün bulunduğu Antarktika kıtasında farklı meslek disiplinlerince gerçekleştirilecek çalışmalarda gereksinim duyulan anlık 3-Boyutlu (3B) konum bilgisinin üretilmesinde uydu-bazlı konum belirleme yöntemleri içerisinde yer alan gerçek-zamanlı Hassas Nokta Konum Belirleme (RT-PPP) tekniğinin kullanılabi...
IGS Real-Time Service (RTS) provides GPS-only or GPS+GLONASS real-time precise orbit and clock products for RT-PPP applications. On the other hand, some IGS analysis centers (ACs) provide real-time precise products for Multi-GNSS RT-PPP within the scope of the IGS-Multi-GNSS EXperiment (MGEX) project. In addition, the Spaceopal GmbH, the prime cont...
In the last decades, a severe decrease of the glacial masses is observed in the Polar Regions due to the increasing effect of global warming. Continuous observations in these regions are required for quantifying the loss in the glacier mass and monitoring the increase in mean sea level. Besides, as a consequence of the glaciers mass loss, an uplift...
The maintenance of leveling benchmark is both laborious and costly due to distortions caused by geodynamic activities and local deformations. It is necessary to realize geoid-based vertical datum, which also enables calculation from ellipsoidal heights obtained from GNSS to orthometric heights that have physical meaning. It can be considered as an...
The earthquake with a magnitude of Mw 6.9 (according to Kandilli Observatory and Earthquake Research Institute-KOERI) occurred 8 km north of Samos Island at a depth of 16 km, on 30.10.2020, at 11:51:24 UTC. It took place on the north-dipping normal fault zone of approximately 40 km length in the sea between Samos Island of Greece and Kuşadası Bay o...
Because of the inclined-orbit of GNSS constellations that are not cover the Polar Regions, the polar gaps occur between certain latitudes and therefore in these regions the satellite observations are limited around the zenith direction. In addition, from summer to winter season, the daylight and weather conditions vary tremendously in the Polar Reg...
Although various positioning methods are used in many engineering projects, Precise Point Positioning (PPP) technique, which enables more economical and accurate positioning, stands out among these positioning methods. The most important criteria affecting the positioning accuracy during the solution of the PPP are the quality of the precise satell...
Performance Analysis of Precise Point Positioning(PPP)Technique in Antarctica Continent
It is of great importance to observe the climate changes that occur in the polar regions with the effect of global warming, to better reveal the atmospheric physics, and to continuously monitor the deformations and tectonic movements in the glaciers. In this co...
Change Detection at Petermann Glacier
