Bruyninx C.,Royal Observatory of Belgium |
Habrich H.,Bundesamt fur Kartographie und Geodasie |
Sohne W.,Bundesamt fur Kartographie und Geodasie |
Kenyeres A.,FOMI Satellite Geodetic Observatory |
And 2 more authors.
International Association of Geodesy Symposia | Year: 2012
This paper describes the EUREF Permanent Network (EPN) and the efforts made to monitor and improve the quality of the EPN products and services. It is shown that the EPN is becoming a multi-GNSS tracking network and that the EPN Central Bureau and the Analysis Centers are preparating to include the new satellite signals in their routine operations. Thanks to the EPN Special Project on "Reprocessing", set up early 2009, EPN products with much better quality and homogeneity will be generated. The Special Project on "Real-time analysis" will improve the reliability of the EPN real-time data streams and develop new EPN real-time products. © Springer-Verlag Berlin Heidelberg 2012.
Ivins E.R.,Oceans |
Watkins M.M.,Oceans |
Yuan D.-N.,Oceans |
Dietrich R.,TU Dresden |
Rulke A.,Bundesamt fur Kartographie und Geodasie
Journal of Geophysical Research: Solid Earth | Year: 2011
Land glacier extent and volume at the northern and southern margins of the Drake Passage have been in a state of dramatic demise since the early 1990s. Here time-varying space gravity observations from the Gravity Recovery and Climate Experiment (GRACE) are combined with Global Positioning System (GPS) bedrock uplift data to simultaneously solve for ice loss and for solid Earth glacial isostatic adjustment (GIA) to Little Ice Age (LIA) cryospheric loading. The present-day ice loss rates are determined to be -26 ± 6 Gt/yr and -41.5 ± 9 Gt/yr in the Southern and Northern Patagonia Ice Fields (NPI+SPI) and Antarctic Peninsula (AP), respectively. These are consistent with estimates based upon thickness and flux changes. Bounds are recovered for elastic lithosphere thicknesses of 35 ≤ h ≤ 70 km and 20 ≤ h ≤ 45 km and for upper mantle viscosities of 4-8 × 1018 Pa s and 3-10 × 1019 Pa s (using a half-space approximation) for NPI+SPI and AP, respectively, using an iterative forward model strategy. Antarctic Peninsula ice models with a prolonged LIA, extending to A.D. 1930, are favored in all χ2 fits to the GPS uplift data. This result is largely decoupled from Earth structure assumptions. The GIA corrections account for roughly 20-60% of the space-determined secular gravity change. Collectively, the on-land ice losses correspond to volume increases of the oceans equivalent to 0.19 ± 0.045 mm/yr of sea level rise for the last 15 years. Copyright 2011 by the American Geophysical Union.
Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: SPA.2010.1.1-06 | Award Amount: 1.20M | Year: 2011
The land surface is a decisive factor regarding the state of the environment and human well-being. To manage it well, regularly obtained up do date information on land use and land cover is needed. Land monitoring provides this information through thematic maps based on the interpretation of areal photography, satellite imagery and further sources. These maps aid spatial planning, nature protection, agricultural policy, forestry, water catchment area management, etc. In spite of its importance, land monitoring in Europe is quite inefficient owing to lacking coordination between the national, sub-national, and European levels. Efforts are duplicated and given opportunities for mutual support are not utilised which means a substantial waste of resources. HELM is a network of authorities concerned with land monitoring across Europe. It will initiate a move to increase the maturity of European land monitoring along five sequential steps: (1) mutual interest in achieving reciprocal knowledge, (2) shared visions and planning for the future, (3) joint activities by taking on tasks collectively, (4) alignment of national systems involving the mutual adaptation of data interpretation methods and of the timing of data gathering, (5) lasting integration and combining data across all administrative levels. HELM envisions a coherent European land monitoring system characterised by high quality data and efficient productivity. This system will combine the broad range of specific expertise and resources of relevant authorities in the member states. Their work will be supported through targeted centrally supplied measures fulfilling common requirements for raw data and data processing. Through a continuous flow of knowledge from the local to the European scale and the other way round, future information needs regarding land use and land cover will be met as an essential basis for managing the land surface in the framework of European sustainable development.
Montenbruck O.,German Space Operations Center |
Hauschild A.,German Space Operations Center |
Hessels U.,Bundesamt fur Kartographie und Geodasie
GPS Solutions | Year: 2011
The Cooperative Network for GIOVE Observation (CONGO) is a global network of real-time capable multi-constellation GNSS receivers, which has been established by the German Aerospace Center (DLR) and the German Federal Agency for Cartography and Geodesy (BKG) as a test bed for experimentation with the new Galileo signals. The CONGO network employs a variety of different antennas and receivers which have become available for public use over the last 2 years. Following an overview of the network and the employed user equipment, the paper discusses the achieved GPS/GIOVE tracking performance. This includes a characterization of antenna gain patterns as well as receiver noise and multipath errors. Special attention is given to the discussion of inter-system biases. The nature and variation of these biases is illustrated based on a set of three different receivers operated in a zero-baseline configuration at the Wettzell site. © 2010 Springer-Verlag.
Von Gosseln I.,Leibniz University of Hanover |
Kutterer H.,Bundesamt fur Kartographie und Geodasie
International Association of Geodesy Symposia | Year: 2015
In order to perform an efficiency optimization of surveying processes typical measuring processes can be modeled by using Petri nets. Petri nets are a mathematical and graphical modeling language for the description of concurrent and distributed systems. The modeling allows a simulation and an efficiency optimization of the processes. Simulations of surveying processes can be performed with different input values like the number of staff or the order of activities. The main goals of the optimization are the reduction of cost or the decrease of the required time. Since the exact duration of the individual steps of a measurement task cannot be defined in advance, timed transitions in stochastic Petri nets are selected to introduce the duration of the activities. The presented method is applied to the optimization of a polar network measurement. © Springer International Publishing Switzerland 2015.
Heiker A.,Leibniz University of Hanover |
Kutterer H.,Bundesamt fur Kartographie und Geodasie
International Association of Geodesy Symposia | Year: 2015
Models are often treated as deterministic in geodetic practice. Hence, inaccurate models directly affect the results of geodetic measurements. This paper proposes a method for the mutual validation of models and observed data. To consider the inaccuracy of models, data resulting from models are treated as stochastic parameter in a linear least squares adjustment. The required stochastic information is obtained by empirical auto and cross correlation functions. This approach is applied to the problem of the mutual validation of Earth orientation parameters, second degree gravity field coefficients and geophysical excitation functions. The results and the limitations of this approach are discussed. © Springer International Publishing Switzerland 2015.
Illert A.,Bundesamt fur Kartographie und Geodasie
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2012
The environmental sector in the European Union has taken the lead in an initiative called INSPIRE that aims at creating the framework for the European Spatial Data Infrastructure (ESDI). With INSPIRE it shall be possible to combine spatial data from different sources in the National Spatial Data Infrastructures (NSDI) across the Community in a consistent way and share them between several users and applications. INSPIRE legislation is legally binding on all authorities in the EU member states. From a technical point of view, INSPIRE shall achieve the interoperability of spatial data sets by means of network services. The client of such services shall be enabled to discover, view and download spatial data sets in conformance with harmonised European specifications. INSPIRE promotes conceptual modeling and mandates formal modeling languages such as UML and GML. The domain experts need to find a balance between advanced concepts and traditional but well established patterns, while the proposed solutions should not result in excessive costs for the data providers.
Schreiber K.U.,TU Munich |
Klugel T.,Bundesamt fur Kartographie und Geodasie |
Wells J.-P.R.,University of Canterbury |
Hurst R.B.,University of Canterbury |
Gebauer A.,TU Munich
Physical Review Letters | Year: 2011
We demonstrate a 16m2 helium-neon ring laser gyroscope with sufficient sensitivity and stability to directly detect the Chandler wobble of the rotating Earth. The successful detection of both the Chandler and the annual wobble is verified by comparing the time series of the ring laser measurements against the "C04 series" of Earth rotation data from the International Earth Rotation and Reference System Service. © 2011 American Physical Society.
Schmitz S.,Bundesamt fur Kartographie und Geodasie
ZFV - Zeitschrift fur Geodasie, Geoinformation und Landmanagement | Year: 2012
Geoportal.DE reveals the contents of the Spatial Data Infrastructure of Germany (GDI-DE). It utilizes several Web Services from GDI-DE. Users can promptly search within the central search engine of GDI-DE (Geodatenkatalog-DE), which currently contains around 80.000 decentrally maintained sets of metadata on spatial data and spatial data services from across all levels of public administration in Germany. Many of the described spatial data sets can be easily added to the Map Viewer, which offers three different background maps based on the official basic spatial data from the surveying authorities of the federal states: the WebAtlasDE (color, gray) and digital orthoimages. Geoportal.DE is completed by a search utility for places and addresses and several thematic maps covering Germany. This contribution describes the technical architecture and gives details on the utilized Web Services from GDI-DE.
Hase H.,Bundesamt fur Kartographie und Geodasie |
Pedreros F.,University of Wisconsin - Madison
Journal of Geodesy | Year: 2014
The Global Geodetic Observing System (GGOS) proposes 30–40 geodetic observatories as global infrastructure for the most accurate reference frame to monitor the global change. To reach this goal, several geodetic observatories have upgrade plans to become GGOS stations. Most initiatives are driven by national institutions following national interests. From a global perspective, the site distribution remains incomplete and the initiatives to improve this are up until now insufficient. This article is a contribution to answer the question on where to install new GGOS observatories and where to add observation techniques to existing observatories. It introduces the iterative most remote point (MRP) method for filling in the largest gaps in existing technique-specific networks. A spherical version of the Voronoi-diagram is used to pick the optimal location of the new observatory, but practical concerns determine its realistic location. Once chosen, the process is iterated. A quality and a homogeneity parameter of global networks measure the progress of improving the homogeneity of the global site distribution. This method is applied to the global networks of VGOS, and VGOS co-located with SLR to derive some clues about where additional observatory sites or additional observation techniques at existing observatories will improve the GGOS network configuration. With only six additional VGOS-stations, the homogeneity of the global VGOS-network could be significantly improved by more than 45 %. From the presented analysis, 25 known or new co-located VGOS and SLR sites are proposed as the future GGOS backbone: Colombo, Easter Island, Fairbanks, Fortaleza, Galapagos, GGAO, Hartebeesthoek, Honiara, Ibadan, Kokee Park, La Plata, Mauritius, McMurdo, Metsahövi, Ny Alesund, Riyadh, San Diego, Santa Maria, Shanghai, Syowa, Tahiti, Tristan de Cunha, Warkworth, Wettzell, and Yarragadee. © 2014, Springer-Verlag Berlin Heidelberg.