DGFI-TUM contributes to the implementation of an UN Resolution for a Global Geodetic
A highly precise and long-term stable global geodetic reference frame is an indispensable requirement for a reliable determination of global sea level rise over many decades.
In February 2015, the UN General Assembly adopted its first geospatial resolution „A Global Geodetic Reference Frame for Sustainable Development“. This resolution recognizes the importance of geodesy for many societal and economic benefit areas, including navigation and transport, construction and monitoring of infrastructure, process control, surveying and mapping, and the growing demand for precisely observing our planet's changes in space and time. The resolution stresses the significance of the global reference frame for accomplishing these tasks, for natural disaster management, and to provide reliable information for decision-makers.
The United Nations Global Geospatial Information Management (UN-GGIM) Working Group on the Global Geodetic Reference Frame (GGRF) has the task for drafting a roadmap for the enhancement of the GGRF under UN mandate.
Based on its competence in the realization of reference frames DGFI-TUM is involved in this activity by contributing to the compilation of a concept paper in the frame of the International Association of Geodesy (IAG). The main purpose of this paper is to provide a common understanding for the definition of the GGRF and the scientific basis for the preparation of the roadmap to be accomplished by the UN-GGIM Working Group on the GGRF. [more]
DGFI has been integrated into the Technische Universität München
With effect from January 1st 2015 the Deutsches Geodätisches Forschungsinstitut has become an institute of the Technische Universität München (TUM)
. It is part of TUM's Faculty of Civil, Geo and Environmental Engineering (BGU)
The DGFI has a history of more than six decades, and it is the largest purely geodetic research institution in Germany. Originally the institute was established in 1952 as an independent research facility at the Bavarian Academy of Sciences and Humanities (BAdW) in Munich. The institute will presume its internationally recognised geodetic basic research from now on under its new official name Deutsches Geodätisches Forschungsinstitut der Technischen Universität München (DGFI-TUM).
We would like to inform that connected with the restructuring the email addresses of the DGFI staff have changed.
Antarctic outlet glacier mass change resolved at basin scale from satellite gravity gradiometry
Dramatic ice mass loss has been observed in West Antarctica using space gravimetry from the Gravity Recovery and Climate Experiment (GRACE) satellite mission, satellite altimeter data, and input-output methods (IOM). This was reported by DGFI scientists in their recent article "Antarctic outlet glacier mass change resolved at basin scale from satellite gravity gradiometry (Geophysical Research Letters, DOI:10.1002/2014GL060637, 2014).
GRACE, satellite altimetry and IOM complement one another: GRACE provides a direct estimate of total mass change at fairly low resolution while the other two methods provide ice height variation or flux variation (IOM) at much higher spatial resolution. For satellite altimetry, an array of assumptions, with possible biases, may corrupt the conversion of ice height to mass change. Time-varying GRACE mass mapping is limited by the fact that it cannot provide the small-scale resolution that satellite altimetry provides, and it is difficult to isolate the exact location of a mass anomaly without introducing constraints. [more]
Cross-calibration for 20 years satellite altimetry
Climate studies require long data records extending the lifetime of a single remote sensing satellite mission. Precise satellite altimetry exploring global and regional evolution of the sea level has now completed a two decade data record. A consistent long-term data record can only be constructed from a sequence of different, partly overlapping altimeter systems by means of a careful cross-calibration.
At DGFI, satellite altimeter cross-calibrations are routinely performed with all available altimeter systems including mission phases from geodetic and drifting orbits. The methodology of this calibration and latest results are described in the recent article "Multi-Mission Cross-Calibration of Satellite Altimeters: Constructing a Long-Term Data Record for Global and Regional Sea Level Change Studies" (Remote Sensing, 2014, available via open-access).
The paper compiles – for the first time – a complete list of range biases between all relevant altimeter systems of the last 20 years, from ERS-1 to SARAL including less prominent missions such as GFO, ICESat, or HY-2A (cf. Table). Moreover, the computations provide time series of radial errors and allow to estimate empirical auto-covariance functions, systematic variations in the geo-centering of altimeter satellite orbits, as well as geographically correlated mean errors for all altimeter systems.
Deutsches Geodätisches Forschungsinstitut der
Technischen Universität München
2015-11-16 - 2015-11-17
VII SIRGAS School on Reference Systems
2015-11-16 - 2015-11-19
International Symposium on GNSS (IS-GNSS 2015)
2015-11-18 - 2015-11-20
Symposium SIRGAS 2015
2015-11-23 - 2015-11-26
4th International VLBI Technology Workshop (IVTW)
2015-12-09 - 2015-12-11
9th International Symposium on Mobile Mapping Technology (MMT2015)
2015-12-14 - 2015-12-18
AGU 2015 Fall Meeting