Empirical assessment of obstruction adaptive elevation masks to mitigate site-dependent effects     

Zimmermann  Florian  Eling  Christian  Kuhlmann  Heiner 《GPS Solutions》2017,21(4):1695-1706

GPS Solutions - Site-dependent effects are accuracy-limiting factors in static and kinematic GNSS-based positioning applications since they cannot be minimized using differential techniques. In...  相似文献   

A sensitivity study of the WRF model in offshore wind modeling over the Baltic Sea     

Huidong Li  Bj?rn Claremar  Lichuan Wu  Christoffer Hallgren  Heiner K?rnich  Stefan Ivanell  Erik Sahlée 《地学前缘(英文版)》2021,12(6):209-222

Accurate wind modeling is important for wind resources assessment and wind power forecasting.To improve the WRF model configuration for the offshore wind modeling over the Baltic Sea,this study per-formed a sensitivity study of the WRF model to multiple model configurations,including domain setup,grid resolution,sea surface temperature,land surface data,and atmosphere-wave coupling.The simu-lated offshore wind was evaluated against LiDAR observations under different wind directions,atmo-spheric stabilities,and sea status.Generally,the simulated wind profiles matched observations,despite systematic underestimations.Strengthening the forcing from the reanalysis data through reducing the number of nested domains played the largest role in improving wind modeling.Atmosphere-wave cou-pling further improved the simulated wind,especially under the growing and mature sea conditions.Increasing the vertical resolution,and updating the sea surface temperature and the land surface infor-mation only had a slight impact,mainly visible during very stable conditions.Increasing the horizontal resolution also only had a slight impact,most visible during unstable conditions.Our study can help to improve the wind resources assessment and wind power forecasting over the Baltic Sea.  相似文献   

Narrow-beam X-ray tests of CCD edge response     

Stephen Kuhlmann  Harold Spinka  Joseph P. Bernstein  Kevin A. Beyer  Lisa M. Gades  Thomas E. Kasprzyk  Antonino Miceli  Richard A. Spence  Richard Talaga 《Experimental Astronomy》2011,29(3):135-144

The physical boundaries of a fully-depleted CCD can lead to distorted field lines and non-uniform response. We study this response with a beam of X-rays constrained to a width of less than one pixel (15 \upmu\upmum), and a system to map the CCD response as a function of transverse position.  相似文献   

Book reviews     

Heiner Josenhans  John H. Wrenn  Dag Nummedal 《Geo-Marine Letters》1994,14(1):65-67

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Guided Waves from Sources Outside Faults: An Indication for Shallow Fault Zone Structure?   总被引：1，自引：0，他引：1  

Miko Fohrmann  Heiner Igel  Gunnar Jahnke  Yehuda Ben-Zion 《Pure and Applied Geophysics》2004,161(11-12):2125-2137

— Using 3-D numerical modeling of seismic wave propagation we investigate the possibility of generating fault zone (FZ) trapped wave energy from sources well outside a fault. The FZ is represented by a O(200 m) wide vertical low velocity layer in a half space. We find that FZ trapped waves can be excited from sources well outside the fault if (1) the low-velocity structure extemds only to shallow depth and the source is located at greater depth or (2) the structure of the low-velocity zone is such that only the shallow part of the FZ traps energy. FZ trapped waves are not excited from sources well outside a FZ continuous with depth. The results support, in conjunction with recent observational evidence, a model for natural faults with shallow trapping structures rather than ones that span the entire seismogenic zone. This may have implications for fault mechanics as well as for aspects of shaking hazard near faults.  相似文献   

Book review     

Heiner Goldbach 《GeoJournal》1991,25(1):26-26

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Fundamental issues in quantitative estimation of mineral resources     

Guocheng Pan  DeVerle P. Harris  Tim Heiner 《Natural Resources Research》1992,1(4):281-292

Several issues considered to be fundamental in quantitative estimation of mineral resources and selection of mineral targets are addressed. Integration of multiple data sets, either by experts or by statistical methods, has become a common practice in estimation of mineral potential. Several major problems in data integration must be solved to significantly improve mineral resource estimation. Issues related to randomness of mineral endowment, basic statistical tools, exceptionalness of ore, and economic truncation and translation are discussed in the first part of the article. A number of important technical problems in data integration are also identified; they include data compilation, information enhancement, information synthesis, and target selection.  相似文献   

Geo-/Object-Coding for Local-Change Assessment     

Heiner Benking Dipl.-Ing  Heiko Schmidt v. Braun 《GeoJournal》1990,20(2):167-173

Missing availability of reliable and specific landscape data may pose substantial restrictions to successful exploitation of remote sensing data and fast implementation of GIS (Geo-Information Systems). The possibilities to document conditions with high spacial resolution at a given time and to review changing aspects by different disciplines represent opportunities for complex environmental programs.The article covers: geodata acquisition and processing, research, execution, and ergonomical/cognitive aspects. Application in inpenetrable terrain for research, landuse, and engineering requirements proved the feasibility especially in areas with high demand for timely, accurate, and comprehensive surveys.Airborne close-range sensing was developed to survey localities and regions. It is no competition to global-change monitoring and large area are mapping programs possible with remote sensing. Substituting only the bulk of field-work, leaving time for in-depth review in the field or in the office, the system provides a possibility to restudy points of interest.Exploitation of advanced metric cameras, specialized airborne platforms, and spatial overlay, recognition, and discrimination techniques form the backbone of the TOPOGRAMM approach. Multi-sectoral, multi-temporal, multi-spectral survey and processing methods rely basically on enlarged image scales additional to conventional aero-photogrammetry and analytic plotting. Measurements and identification, not primarily interpretation, allow to establish high-fidelity and high resolution geo-frameworks. Focussing on micro- and mesoscales, no emphasis is given to highest geometric accuracy used for geodetic surveys. Drawing near to the object allows extraction of thematical and semantical information, dimensions, and phenomelogy of objects hitherto only singularily available.

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Eine Abschätzung der mitteleren Niederschlagsmengen über der Nordsee     

Dipl.-Met. Heiner Schmidt 《Ocean Dynamics》1990,43(5):273-284

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Efficient numerical surface wave propagation through the optimization of discrete crustal models—a technique based on non-linear dispersion curve matching (DCM)     

Andreas Fichtner  Heiner Igel 《Geophysical Journal International》2008,173(2):519-533

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