Inst. Geodäsie und Geoinformationstechnik

42 Items

Recent Submissions
GNSS inter-system bias estimation, modeling, and prediction

Jiang, Nan (2019)

Up to now, the precise point positioning (PPP) has stepped from the single system mode into the multi-GNSS combination. The key point of multi-GNSS integrated PPP is to carefully calibrate the inter-system-bias (ISB) between different systems. If ISB can be modeled, this error will be well corrected. It will significantly increase the usability of satellites and enhance compatibility and intero...

Total Least Squares Spline Approximation

Neitzel, Frank ; Ezhov, Nikolaj ; Petrovic, Svetozar (2019-05-22)

Spline approximation, using both values yi and xi as observations, is of vital importance for engineering geodesy, e.g., for approximation of profiles measured with terrestrial laser scanners, because it enables the consideration of arbitrary dispersion matrices for the observations. In the special case of equally weighted and uncorrelated observations, the resulting error vectors are orthogona...

Frame tie based on VLBI observations to near-field spacecraft

Liu, Li (2019)

The objective of this work is to find approaches to realize the link of celestial reference frames, the dynamic spacecraft reference frame and the more stable and accurate International Celestial Reference Frame (ICRF), by observing the spacecraft with Very Long Baseline Interferometry (VLBI). In this work, the phase referencing observations to Global Navigation Satellite System (GNSS) satellit...

Exploration and optimized siting of geothermal wells using a web-based spatial decision support system

Mwaura, Daniel Waweru (2018)

As the world develops and economies grow, there is a commensurate rise in the demand for energy. Many current approaches of fulfilling the increased demand have led to increased pollution through emission of greenhouse gases. A lot of current research in the energy sector is therefore geared towards green and reliable energy sources. Geothermal energy production is one of the leading sources o...

Application of artificial intelligence in Geodesy – A review of theoretical foundations and practical examples

Reiterer, Alexander ; Egly, Uwe ; Vicovac, Tanja ; Mai, Enrico ; Moafipoor, Shahram ; Grejner-Brzezinska, Dorota A. ; Toth, Charles K. (2010)

Artificial Intelligence (AI) is one of the key technologies in many of today's novel applications. It is used to add knowledge and reasoning to systems. This paper illustrates a review of AI methods including examples of their practical application in Geodesy like data analysis, deformation analysis, navigation, network adjustment, and optimization of complex measurement procedures. We focus on...

The calculation of the lunar series on classic Maya monuments

Fuls, Andreas (2007)

Archaeological and historical evidence clearly shows that the Lunar Series of mythical dates were calculated backward—that is, they were often determined from the date on which the monument was erected using a specific formula to calculate the age of the moon. In this article, I present a high-precision adjustment technique that confirms the “Palenque formula” using Lunar Series data from recen...

Determination of intensity-based stochastic models for terrestrial laser scanners utilising 3D-point clouds

Wujanz, Daniel ; Burger, Mathias ; Tschirschwitz, Felix ; Nietzschmann, Tassilo ; Neitzel, Frank ; Kersten, Thomas P. (2018-07-07)

Recent advances in stochastic modelling of reflectorless rangefinders revealed an inherent relationship among raw intensity values and the corresponding precision of observed distances. In order to derive the stochastic properties of a terrestrial laser scanner’s (TLS) rangefinder, distances have to be observed repeatedly. For this, the TLS of interest has to be operated in the so-called 1D-mod...

Tidal deformation of planets and satellites

Steinbrügge, Gregor (2018)

In this thesis, methods are developed and studied for radar and laser altimetry to measure radial tidal deformations of planets and satellites. The thesis investigates further how the tidal measurement allows constraining the interior structure and rheologic properties of the bodies. A semi-analytical performance model for laser altimetry has been developed to predict probability of false detec...

Grammar-guided reconstruction of semantic 3D building models from airborne LiDAR data using half-space modeling

Wichmann, Andreas (2018)

For several years, digital 3D city models have taken a central role in a number of different tasks. These models are used in urban and regional planning, surveying, and navigation and telecommunication technology. They also enable in the environmental field precise analyses and simulations of pollutant, flood, and noise propagation. For many applications, realistic building models are an essent...

Preparation of the satellite receiving station at Ny-Ålesund for upcoming satellite missions by means of new made-to-measure antenna operation software

Falck, Carsten (2018)

The German Research Centre for Geosciences GFZ operates a satellite-receiving station at Ny-Ålesund, Spitsbergen since 2001. Valuable support for several satellite missions was provided by the station on a best effort basis, while technical and software related issues, as well as uncertainties regarding important system properties, hindered any project participations with more binding commitmen...

High-frequency earth rotation variations deduced from altimetry-based ocean tides

Madzak, Matthis ; Schindelegger, Michael ; Böhm, Johannes ; Bosch, Wolfgang ; Hagedoorn, Jan (2016)

A model of diurnal and semi-diurnal variations in Earth rotation parameters (ERP) is constructed based on altimetry-measured tidal heights from a multi-mission empirical ocean tide solution. Barotropic currents contributing to relative angular momentum changes are estimated for nine major tides in a global inversion algorithm that solves the two-dimensional momentum equations on a regular 0.5^\...

The integrated use of GPS/GLONASS observations in network code differential positioning

Przestrzelski, Paweł ; Bakuła, Mieczysław ; Galas, Roman (2016)

We present the methodology and results of GPS/GLONASS integration in network code differential positioning for regional coverage across Poland using single frequency. Previous studies have only concerned the GPS system and relatively short distances to reference stations of up to tens of kilometers. This study is limited to using GPS and GLONASS. However, the methodology presented applies to al...

Application of one-way laser ranging data to the Lunar Reconnaissance Orbiter (LRO) for time transfer, clock characterization and orbit determination

Bauer, Sven (2017)

NASA’s Lunar Reconnaissance Orbiter (LRO) mission carries a suite of seven instruments with the Lunar Orbiter Laser Altimeter (LOLA) being one of them. Due to a hardware extension the instrument is capable of detecting regular altimetry measurements from the lunar surface and laser pulses from Earth-based ground stations concurrently at a precision of 15 cm. Utilizing the ground-based ranges fo...

Determining rotational elements of planetary bodies

Burmeister, Steffi (2017)

Die Rotationselemente eines planetaren Körpers geben seine Orientierung im Raum in Bezug auf den internationalen Himmelsreferenzrahmen (engl. ICRF) an. Sie sind notwendig für die Berechnung von Kontrollpunktnetzen (KPN) und für die Erstellung von z.B. Karten oder Geländemodellen des Körpers. Diese Arbeit beschreibt den Bündelblockausgleich im inertialen Referenzrahmen. Das ist eine Methode, um ...

Monitoring dynamics of semi-arid forests with multi-sensor time series

Gärtner, Philipp (2017)

Dryland degradation is a challenging environmental problem in the context of global change and China is among those countries that are most severely affected. The far-west province of Xinjiang Uyghur Autonomous Region experienced ambitious agricultural development and land reclamation projects which caused major environmental degradation, loss of forest cover and the advancement of desertificat...

GPS reflectometry

Beckheinrich, Jamila (2016)

Bevölkerungswachstum und Klimawandel haben tiefgreifende Veränderungen im Mekong Delta verursacht. Eine dieser Veränderungen betrifft das zunehmende Auftreten extremer Hochwasserereignisse. Um das Leben der Menschen in den Küstenbereichen des Deltas während solcher Ereignisse zu schützen, ist es von großer Bedeutung, die Wasserstandhöhe in diesen Bereiche kontinuierlich zu überwachen. Standardm...

Vesta CPN 82806

Burmeister, Steffi (2016-11-29)

The ASCII file contains a Control Point Network (CPN) of Vesta, consisting of 82806 points in metric 3D coordinates (m) and the forward intersection error of each coordinate. The CPN was used to create the figures of Vesta in chapter 5 of my dissertation "Determining rotational elements of planetary bodies - Method and implementation of an inertial frame bundle block adjustment"

Phobos CPN 679

Burmeister, Steffi (2016-11-28)

The ASCII file contains a Control Point Network (CPN) of Phobos, consisting of 679 points in metric 3D coordinates (m) and the computed uncertainty of each coordinate. The CPN was used to create the figures of Phobos in chapter 5 of my dissertation "Determining Rotational Elements of Planetary Bodies - Method and Implementation of an Inertial Frame Bundle Block Adjustment".

Real-time sensing of atmospheric water vapor from multi-GNSS constellations

Lu, Cuixian (2016)

With the modernization of GPS (Global Positioning System), recovery of GLONASS (the Russian GLObal NAvigation Satellite System), and newly emerging constellations, like the Chinese BeiDou Navigation Satellite System and the European Galileo system, the world of Global Navigation Satellite Systems (GNSS) has experienced dramatic changes within the field of multi-constellation GNSS. The rapid de...

Online estimation of inter-frequency/system phase biases in precise positioning

Tian, Yumiao (2016)

Global Navigation Satellite Systems (GNSS) play an important role in precise positioning for geodesy and surveying engineering. The key to the real-time GNSS precise positioning is the instantaneous integer ambiguity resolution. However, some of the biases in carrier phase observations cannot be removed by differencing between either stations or satellites, so the integer nature of the double-d...