Inst. Geodäsie und Geoinformationstechnik

34 Items

Recent Submissions
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...

GNSS precise point positioning with application of the equivalence principle

Xu, Yan (2016)

In the last decade Precise Point Positioning (PPP) has become a powerful and widely used technique for positioning by means of Global Navigation Satellite System (GNSS) in geodetic/scientific and civil/daily applications. Meanwhile, the equivalence principle of GNSS data processing has been developed and can now be easily explained and accepted since it was firstly algebraically pointed out in ...

Terrestrial laser scanning for geodetic deformation monitoring

Wujanz, Daniel (2016)

The determination of geometric changes within an area or object of interest by means of repetitive surveys at different points in time is referred to as geodetic deformation monitoring. Despite its development in the early years of the twentieth century the original processing chain remained identical in essence until now. It contains the choice of suitable viewpoints, observation of at least t...

Observations of Mercury's rotational state from combined MESSENGER laser altimeter and image data

Stark, Alexander (2015)

In this thesis observations of Mercury's rotational state were carried out, using orbital data from the Mercury Surface, Space environment, geochemistry, and Ranging (MESSENGER) spacecraft. First, a reference rotation model of Mercury was derived. New Solar System ephemerides were used to obtain updated values for the mean orbital period and plane of Mercury as well as the instantaneous Laplace...

Deriving incline for street networks from voluntarily collected GPS traces

John, Steffen (2016)

The knowledge of incline is useful for many use-cases in navigation for electricity-powered vehicles, cyclists or mobility-restricted people (e.g. wheelchair users). Digital elevation models (DEMs) such as from laser scanning obtained DEMs or SRTM are either too expensive, not globally available or not accurate enough. Therefore, voluntarily collected GPS traces collect by users of the OpenStre...

Development and experiments with the Ionospektroskop and a comparison with selected ionospheric parameters

Matalqah, Mohammed (2015)

The earth atmosphere in general and its ionospheric part in specific has a significant importance on the operation and reliability of a wide spectrum of geodetic applications. The evolution of the ionosphere depends primarly on the solar radiation where the existing electron density and the atmospheric air density drive the ionosphere to become stratified into 3 layers called: D, E, F1 and F2 l...

Real-time high rate GNSS techniques for earthquake monitoring and early warning

Li, Xingxing (2015-08-21)

In der letzten Zeit wurden immer mehr Hochfrequenz-GNSS-Stationen auf der ganzen Welt installiert, um Daten in Echtzeit zur Verfügung stellen. Diese Netzwerke bieten eine gute Gelegenheit, um Oberflächenverschiebungen schnell zu erfassen. Dies kann sie zu einem wichtigen Bestandteil für Erdbeben- und Tsunami-Überwachungswarnsysteme machen. Die entsprechende GPS-Echtzeit-Datenanalyse mit ausre...

GNSS kinematic position and velocity determination for airborne gravimetry

He, Kaifei (2015-03-27)

Das weltumspannende Satelliten-Navigationssystem GNSS spielt eine wichtige Rolle für die Fluggravimetrie. Gegenstand dieser Arbeit ist die Entwicklung zuverlässiger GNSS-Algorithmen und Software für die hochgenaue GNSS-Datenanalyse in der Fluggravimetrie. Ausgehend von den Anforderungen für praktische Anwendungen der Fluggravimetrie lassen sich die Beiträge und Schwerpunkte dieser Dissertation ...

Measurements and data analysis in relation to the "Ionospektroskop©"

Tang, Hui (2015-02-11)

Die Ionosphäre ist ein Teil der Atomosphäre. Ihre Exisitenz beruht hauptsächlich auf der Sonnenstrahlung. Aufgrund des Vorhandenseins elektrisch aufgeladender Teilchen in der Ionospäre wird sie leitfähig. Die Ionosphäre beinhaltet verschiedene Schichten (D-, E-, F1 und F2- Schicht). Jede Schicht hat ihre eigenen Eigenschaften und zeigt unterschiedliche Einflüsse auf die eindringenden Funksignal...