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Items where Author is "Helm, Veit"

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Number of items: 54.

Article

Article
HAWLEY, R. L. , BRANDT, O. , DUNSE, T. , HAGEN, J. O. , Helm, V. , KOHLER, J. , LANGLEY, K. , MALNES, E. and HØGDA, K. A. (2013)
Using airborne Ku-band altimeter waveforms to investigate winter accumulation and glacier facies on Austfonna, Svalbard ,
Journal of Glaciology, 59 (217), pp. 893-899 .
doi:10.3189/2013JoG13J051 , hdl:10013/epic.42037

Article
Helm, V. , Drews, R. , Steinhage, D. and Neckel, N. (2011)
Validierung von CryoSat-2 Datenprodukten – Genauigkeit und Eindringverhalten ,
Rundtischgespräch: Georadar - Erfahrungen und Perspektiven, Freiberg . 6. + 7. Okt. 2011, Mitteilungen Sonderband I/2011 .
hdl:10013/epic.39265
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Article
Willat, R. , Laxon, S. , Giles, K. , Cullen, R. , Haas, C. and Helm, V. (2011)
Ku-band radar penetration into snow cover on Arctic sea ice using airborne data ,
Annals of Glaciology, 52 (57), pp. 197-205 .
hdl:10013/epic.37028
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Article
de la Peña, S. , Nienow, P. , Shepherd, A. , Helm, V. , Mair, D. , Hanna, E. , Huybrechts, P. , Guo, Q. , Cullen, R. and Wingham, D. (2010)
Spatially extensive estimates of annual accumulation in the dry snow zone of the Greenland Ice Sheet determined from radar altimetry ,
The Cryosphere 4, pp. 467-474 .
doi:10.5194/tc-4-467-2010 , hdl:10013/epic.36407
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Article
Hvidegaard, S. M. , Forsberg, R. , Helm, V. , Hendricks, S. , Skourup, H. , Stenseng, L. , Hanson, S. and Haas, C. (2009)
CRYOVEX 2008 - Final Report ,
DTU Space, Technical Report 2/2009. .
hdl:10013/epic.35790
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Article
Helm, V. , Steinhage, D. , Dietrich, R. and Rülke, A. (2009)
CryoVEx08/09-Antarctica Data Acquisition and Final Processing Report ,
Alfred Wegener Institute, Bremerhaven, Germany. .
hdl:10013/epic.35779
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Article
Hawley, R. L. , Sheperd, A. , Cullen, R. , Helm, V. and Wingham, D. J. (2009)
Ice-sheet elevations from across-track processing of airborne interferometric radar altimetry ,
Geophysical Research Letters., 36 (L22501) .
doi:10.1029/2009GL040416 , hdl:10013/epic.33644

Article
Drews, R. , Rack, W. , Wesche, C. and Helm, V. (2009)
A spatially adjusted elevation model in Dronning Maud Land, Antarctica, based on differential SAR Interferometry ,
IEEE Transactions on Geoscience and Remote Sensing, 47 (8), pp. 2501-2509 .
doi:10.1109/TGRS.2009.2016081 , hdl:10013/epic.33171

Article
Dunse, T. , Eisen, O. , Helm, V. , Rack, W. , Steinhage, D. and Parry, V. (2008)
Characteristics and small-scale variability of GPR signals and their relation to snow accumulation in Greenland's percolation zone ,
Journal of Glaciology, 54 (185), pp. 333-342 .
hdl:10013/epic.31451

Article
Helm, V. and Steinhage, D. (2008)
CryoVEx 2007 - Data Acquisition and Final Processing Report ,
Alfred Wegener Institute, Bremerhaven, Germany. .
hdl:10013/epic.35791
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Article
Stenseng, L. , Hvidegaard, S. M. , Skourup, H. , Forsberg, R. , Andersen, C. J. , Hanson, S. , Cullen, R. and Helm, V. (2007)
Airborne Lidar and Radar Measurements In and Around Greenland CryoVEx 2006 ,
Danish National Space Center Technical Report 9 .
hdl:10013/epic.33645
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Article
Helm, V. , Rack, W. , Cullen, R. , Nienow, P. , Mair, D. , Parry, V. and Wingham, D. J. (2007)
Winter accumulation in the percolation zone of Greenland measured by airborne radar altimeter ,
Geophys. Res. Lett, 34, L06501. .
doi:10.1029/2006GL029185 , hdl:10013/epic.27029

Article
Helm, V. , Hendricks, S. , Göbell, S. , Rack, W. , Haas, C. , Nixdorf, U. and Boebel, T. (2006)
CryoVEx 2004 and 2005 (BoB) data acquisition and final report ,
Alfred Wegener Institute, Bremerhaven, Germany. .
hdl:10013/epic.34417
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Article
Jokat, W. , Berger, D. , Bohlmann, H. , Helm, V. , Hensch, M. , Jousselin, D. , Klein, C. , Lensch, N. , Liersch, P. , Martens, H. , Medow, A. , Micksch, U. , Rabenstein, L. , Rogenhagen, J. , Salat, C. , Schmidt-Aursch, M. C. and Schwenk, A. (2004)
Marine Geophysics, The Expedition ARKTIS XIX/4 of the Research Vessel POLARSTERN in 2003, Reports of Legs 4a and 4b ,
Berichte zur Polar- und Meeresforschung, 475 , pp. 11-37 .
hdl:10013/epic.21300

Article
Jokat, W. , Berger, D. , Helm, V. , Kunsch, B. , Lensch, N. , Martens, H. , Rogenhagen, J. , Salat, C. , Schmidt-Aursch, M. C. , Schubert, B. , Traub, B. and Wollny, K. (2003)
Geophysical investigations ,
Die Expedition ARKTIS XVIII/2 mit FS Polarstern, 2002, Berichte zur Polarforschung, 449 , pp. 8-32 .
hdl:10013/epic.19662

Thesis

Thesis -PhD
Helm, V. (2008)
Airborne SAR / Interferometric Radar Altimeter System (ASIRAS) - Kalibrierung, Validierung und Interpretation der Messergebnisse ,
PhD thesis, Universittät Bremen.
hdl:10013/epic.33643
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Thesis -Diplom
Helm, V. (2003)
Die Struktur des Kontinentalrandes im Gebiet des Larsenschelfes, Antarktische Halbinsel ,
Diplom thesis, Technische Universität Bergakademie Freiberg.
hdl:10013/epic.28534
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Conference

Conference -Poster
Obu, J. , Lantuit, H. , Fritz, M. , Grosse, G. , Sachs, T. and Helm, V. (2014)
Short-term geomorphic dynamics of the Yukon and Herschel Island coasts based on LIDAR DEMs from 2012 and 2013 ,
EUCOP4 European Conference on Permafrost, Evora, Portugal, 19 June 2014 - 21 June 2014 .
hdl:10013/epic.43741
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Conference -Talk
Goeller, S. , Thoma, M. , Grosfeld, K. , Helm, V. and Miller, H. (2014)
Dynamics and mass export of the Ross Ice Streams in West Antarctica, triggered by subglacial hydrological processes ,
REKLIM Workshop, Bad Salzschlirf, Germany, 31 March 2014 - 2 April 2014 .
hdl:10013/epic.43383
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Conference -Poster
Helm, V. , Langhammer, L. and Steinhage, D. (2013)
Ku-Band penetration obtained from airborne radar and laser altimetry and TerraSAR-X in a blue ice area in Antarctica ,
Earth Observation and Cryosphere Science Conference, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.39703

Conference -Talk
Hendricks, S. , Ricker, R. , Helm, V. , Haas, C. , Skourup, H. , Herber, A. , Schwegmann, S. , Gerdes, R. and Davidson, M. (2013)
CryoSat-2 Sea-Ice Freeboard and Thickness ,
ESA Living Planet Symposium, Edinburgh, 9 September 2013 - 13 September 2013 .
hdl:10013/epic.42309
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Conference -Talk
Hendricks, S. , Ricker, R. , Helm, V. , Schwegmann, S. , Haas, C. and Herber, A. (2013)
Mass balance of sea ice in both hemispheres ,
CryoSat Third User Workshop, Dresden, 12 March 2013 - 14 March 2013 .
hdl:10013/epic.42310
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Conference -Talk
Ricker, R. , Hendricks, S. , Helm, V. , Gerdes, R. and Skourup, H. (2012)
Comparison Of Sea-Ice Freeboard And Thickness Distributions From Aircraft Data And Cryosat-2 ,
Earth Observation & Cryospehere Science Conference, ESRIN, Frascati, Italy, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.40969
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Conference -Talk
Langley, K. , Patel, A. , Hawley, R. , Dunse, T. , Hagen, J. , Kohler, J. , Skourup, H. , Gogineni, S. , Forsström, S. , Eiken, T. , Leuschen, C. and Helm, V. (2012)
CryoSat cal/val activities on Austfonna – Part II: Ground-based measurements using a Ku-band radar, for validation of the CryoSat-2 SIRAL data ,
Earth Observation and Cryosphere Science Conference, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.39705

Conference -Talk
Wang, C. , Renner, A. , Gerland, S. , Anfinsen, S. , Brandt, O. , Doulgeris, A. , Dumont, M. , Eltoft, T. , Fors, A. , Granskog, M. , Haapala, J. , Helm, V. , Hendricks, S. , Hudson, S. , Hughes, N. , Lensu, M. , Li, Z. , Moen, M. , Sandven, S. , Skourup, H. , Spreen, G. and Zygmuntowska, M. (2012)
In-situ calibration and validation of CryoSat-2 observations over Arctic first year sea ice north of Svalbard ,
Earth Observation and Cryosphere Science Conference, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.39704

Conference -Poster
Ricker, R. , Hendricks, S. , Helm, V. , Gerdes, R. and Skourup, H. (2012)
A Comparison of Sea-Ice Freeboard Distributions from Aircraft Data and CryoSat-2 ,
20 Years of Progress in Radar Altimetry, Venice, Italy, 24 September 2012 - 29 September 2012 .
hdl:10013/epic.40122
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Conference -Poster
Helm, V. , Drews, R. , Neckel, N. , Knöfel, C. and Steinhage, D. (2012)
CryoSat Cal/Val – Accuracy and Penetration Depth of the CryoSat SARIn product ,
20 Years of Progress in Radar Altimetry, Venice, 24 September 2012 - 29 September 2012 .
hdl:10013/epic.39707

Conference -Conference paper
Helm, V. , Steinhage, D. and Miller, H. (2012)
CRYOSAT Cal/Val activities using the airborne ASIRAS Ku-band system ,
IGARSS 2012, München, 22 July 2012 - 27 July 2012 .
hdl:10013/epic.39706

Conference -Invited talk
Helm, V. and Hendricks, S. (2012)
Eine eisige Mission - Mit CryoSat-2 den Änderungen in den Polargebieten auf der Spur ,
Die Erde im Visier - Sonderausstellung, GEOMAR, Kiel, 15 May 2012 - 24 August 2012 .
hdl:10013/epic.39702

Conference -Talk
Helm, V. (2012)
CryoVEx 2011 - Final Meeting ,
CryoVEx 2011 - Final Meeting, ESA - ESRIN, Frascati, Italy .
hdl:10013/epic.38736
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Conference -Talk
Hendricks, S. , Helm, V. , Herber, A. and Haas, C. (2012)
CryoVEx 2011, Airborne Validation Campaign ,
CryoVEx 2011 Final Meeting .
hdl:10013/epic.38684
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Conference -Talk
Helm, V. and Steinhage, D. (2012)
CryoVExANT-2011 - Data Acquisition Report ,
CryoVEx 2011 - Final Meeting, ESA - ESRIN, Frascati, Italy .
hdl:10013/epic.38737
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Conference -Talk
Helm, V. , Drews, R. , Neckel, N. and Diez, A. (2011)
Validierung von CryoSat-2 -- Genauigkeit und Eindringverhalten ,
9. RTG Georadar, Freiberg, Germany .
hdl:10013/epic.38735
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Conference -Talk
Helm, V. and Hendricks, S. (2011)
Accuracy of surface elevation derived from ASIRAS and CryoSat ,
2nd CryoSat Validation workshop. .
hdl:10013/epic.36855
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Conference -Invited talk
Krumpen, T. , Helm, V. , Hendricks, S. , Steinhage, D. , Nicolaus, M. and Dierking, W. (2011)
Calibration and Validation of CryoSat-2 and TanDEM-X elevation products of land and sea ice by using airborne and field data ,
TanDEM-X Science MeetingFeb. 2011. .
hdl:10013/epic.37105

Conference -Poster
Hendricks, S. , Helm, V. , Stenseng, L. and Haas, C. (2011)
Ku-Band radar penetration into Snow over Arctic sea ice ,
2nd CryoSat Validation Workshop. .
hdl:10013/epic.36883
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Conference -Talk
Hendricks, S. , Haas, C. , Stenseng, L. and Helm, V. (2011)
Validation of CryoSat-2 sea ice freeboard retrievals by ground and airborne surveys ,
IUGG XXV General Assembly, Melbourne. .
hdl:10013/epic.38285
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Conference -Invited talk
Helm, V. (2010)
CryoSat-2, ESA's Mission to Ice ,
Koordinations-Workshop SPP 1257, Dipperz, Germany. .
hdl:10013/epic.35778
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Conference -Conference paper
Hendricks, S. , Stenseng, L. , Helm, V. and Haas, C. (2010)
Effects of Surface Roughness on Sea Ice Freeboard Retrieval with an Airborne Ku-Band SAR Radar Altimeter ,
Geoscience and Remote Sensing (IGARSS 2010), IEEE International Symposium. .
hdl:10013/epic.38266

Conference -Conference paper
Sandberg Sørensen, L. , Stenseng, L. , Simonsen, S. B. , Forsberg, R. , Poulsen, S. K. and Helm, V. (2010)
Greenland Ice Sheet changes from space using laser, radar and gravity. ,
ESA Living Planet 2010, ESA Special Publication SP-686. .
hdl:10013/epic.38270
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Conference -Talk
Helm, V. , Hendricks, S. , Steinhage, D. and Rülke, A. (2009)
Accuracy of surface elevation derived from ASIRAS ,
Joint CryoSat-IceSat Science Team meeting, Reykjavik, Iceland. .
hdl:10013/epic.33472
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Conference -Talk
Helm, V. (2009)
Akkumulationsbestimmung mit Hilfe eines flugzeuggetragenen KU-Band-Radaraltimetersystems ,
Rundtisch-Gespräch Georadar (RTG-8), Freiberg, Germany. .
hdl:10013/epic.33448
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Conference -Talk
Helm, V. , Hendricks, S. , Steinhage, D. and Rülke, A. (2009)
CryoSat-2 Cal/Val Aktivitäten über Landeis ,
CryoSat Nutzerworkshop, AWI Bremerhaven, Germany. .
hdl:10013/epic.35774
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Conference -Talk
Helm, V. (2009)
CryoSat-2, ESA's Mission to Ice ,
Koordinations-Workshop SPP 1158, Hamburg, Germany. .
hdl:10013/epic.33473
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Conference -Talk
Helm, V. (2009)
CryoVEx 2008 - Analysis of ASIRAS Level_1b product ,
CryoVEx 2008 Final Meeting, ESA - ESTEC, Noordweijk, The Netherlands. .
hdl:10013/epic.33474
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Conference -Talk
Helm, V. (2009)
CryoVEx08/09 Antarctica - Final presentation ,
CryoVEx08/09 Antarctica Final meeting, ESA - ESTEC Noordweijk, The Netherlands. .
hdl:10013/epic.33906
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Conference -Talk
Hendricks, S. , Haas, C. , Helm, V. , Stenseng, L. and Tonboe, R. (2009)
Freeboard and HEM sea ice thickness measurements in 2005, 2006 and 2008 ,
Joint CryoSat-IceSat Science Team Meeting, Reykjavik, Iceland. .
hdl:10013/epic.33188
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Conference -Talk
Hendricks, S. , Haas, C. and Helm, V. (2008)
CryoVEx 2008: Airborne sea ice thickness campaign ,
CryoVEx 2008 Mid Term Review, Copenhagen. .
hdl:10013/epic.33462

Conference -Poster
Wesche, C. , Eisen, O. , Helm, V. , Riedel, S. , Rülke, A. and Steinhage, D. (2007)
Surface topography in the center of Dronning Maud Land, Antarctica, derived from airborne radar altimetry and ground based kinematic GPS measurements ,
General Assembly of the European Geosciences Union, Vienna, Austria, 15 April 2007 - 20 April 2007 .
hdl:10013/epic.42129

Conference -Poster
Dunse, T. , Helm, V. , Eisen, O. , Rack, W. and Steinhage, D. (2006)
The Cryosat land ice validation experiment 2004 Part II: Ground-based measurements of the firn structure using GPR ,
EGU General Assembly, Vienna, Austria 07 April 2006. .
hdl:10013/epic.24939
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Conference -Poster
Helm, V. , Cullen, R. and Rack, W. (2006)
The Cryosat land ice validation experiment CryoVex2004 Part I: ASIRAS vs. laser altimeter measurements ,
EGU General Assembly, Vienna, Austria 07 April 2006. .
hdl:10013/epic.26981
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Conference -Poster
Helm, V. and Rack, W. (2006)
The Cryosat land ice validation experiment CryoVex2004 Part I: ASIRAS vs. laser altimeter measurements ,
66. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 6.-9. März, Bremen. .
hdl:10013/epic.26982
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Conference -Poster
Dunse, T. , Helm, V. , Eisen, O. and Rack, W. (2006)
The internal layering of snow along a section of the EGIG-line, western Greenland, derived from GPR and ASIRAS-measurements ,
66. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 6.-9. März, Bremen. .
hdl:10013/epic.24938

Conference -Poster
Helm, V. and Jokat, W. (2003)
The sedimentary structure of the continental slope in the area of Larsen shelf, Eastern margin of Antarctica ,
63. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 23.-28. März, Jena. .
hdl:10013/epic.26984
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