XVIIIth Congress: XVIIIth Congress

kraus, karl; waldhäusl, peter

Bibliographic data

Multivolume work

Persistent identifier:: 1667435949

Title:: XVIIIth Congress

Sub title:: Vienna, Austria 1996

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667435949

Language:: English

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1667437070

Title:: XVIIIth Congress

Scope:: 230 Seiten

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667437070

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(31,B1)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist anhand des Copyrightjahrs ermittelt.

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: REMOTE SENSING OF POLAR REGIONS USING LASER ALTIMETRY Beata M. Csatho and Toni A. Schenk [...] Robert H. Thomas [...] William B. Krabill [...]

Document type:: Multivolume work

Structure type:: Chapter

REMOTE SENSING OF POLAR REGIONS USING LASER ALTIMETRY Beata M. Csatho and Toni A. Schenk Byrd Polar Research Center and Department of Geodetic Sciences and Surveying The Ohio State University Columbus, OH 43210 email: csatho @ohglas.mps.ohio-state.edu Robert H. Thomas Code YS, NASA HQ Washington, DC 20546 William B. Krabill Laboratory of Hydrospheric Processes NASA/Goddard Space Flight Center Wallops Island, VA 23337 Commission I, Working Group 3 KEY WORDS: Mapping, DEM/DTM, Data Integration, Laser Altimetry System, Change_Detection ABSTRACT The vast ice sheets of Antarctica and Greenland cover almost 10% of the Earth's land surface. Together with sea ice they have a sig- nificant influence on local and global climate. Moreover, the mass balance of the polar ice is a sensitive indicator of global climate changes. There is a growing concern that some ice fluctuation may occur at a rapid rate with an associated effect on the global sea level. Thus it is imperative to monitor the ice sheets on a global scale, assess their mass balance, and predict their future behavior. This paper reports about studies that have been carried out to derive DEMs and topographic maps from airborne laser altimetry data. NASA's laser scanning system covers a 130 to 200 m wide swath with a set of overlapping spirals. The densily distributd data, to- gether with an accuracy of 10 to 20 cm, lends itself into deriving accurate DEMs and into generating topographic maps that contain interesting morphological details necessary to analyze the surface characteristic as well as changes. The position of the system is determined by kinematic GPS. A ring-laser gyro inertial navigation system provides attitude information. Independent attitude in- formation is obtained from three widely separated GPS antennas on the airplane, suitable to control the INS drift. For the experiments described in this paper, five parallel flight strips have been bridged together to form a 4 km wide and 400 km long DEM. In order to check the accuracy, an independent DEM was derived by photogrammetric methods. A detailed analys con- firmed a strong agreement between the two DEMs. Also the topography depicted by the two approaches is very similar. 1. INTRODUCTION Program the Airborne Topographic Mapper (ATM) - an air- borne scanning system - has been used on several missions in The vast ice sheets of Antarctica and Greenland cover almost Greenland and the Canadian Arctic. The program can be con- 10% of the Earth's land surface. Together with sea ice they have sidered as a predecessor of a satellite laser altimetry program. a significant influence on local and global climate. Moreover, The Geoscience Laser Altimetry System (GLAS), currently the mass balance of polar ice masses is a sensitive indicator of under development, will be launched in the Earth Observation global climate changes. There is a growing concern that some System Land Ice Altimetry (EOS ALT-L) mission in 2002. ice fluctuation may occur at a rapid rate with an associated ef- fect on the global sea level. Thus it is imperative to monitor the The ATM laser scanning system covers a 130-200 m wide ice sheets on a global scale, assess their mass balance, and pre- swath with a set of overlapping spirals, providing a dense data dict their future behavior. set along the flight lines suitable for mapping ice sheet topogra- phy to unprecedented accuracy and detail. This continuous and This task can not be accomplished by using traditional, well- accurate mapping capability has major potential for mass bal- known and proven technologies. Ice sheets exhibit a dynamic ance studies. Although this high accuracy is achieved only behavior with some ice streams moving as much as 1 km per along the aircraft flight lines, the resulting elevation profiles can year. Their surface elevation changes throughout the year and also be used for mapping surface features, such as wind gener- the effect of global climate changes is superimposed on this ated ripples (sastrugi), lakes, and surface undulations. annual cycle. Clearly, detection of long term changes requires repeat measurements for several years. Another factor to con- This paper reports about the studies that have been carried out sider is the size - the area to be monitored is huge. Taking the to derive Digital Elevation Models (DEMs) and topographic required accuracy into account, the hostility of the area maps from airborne laser altimetry data. After a brief descrip- (remoteness, accessibility, weather), the picture of an enormous tion of the laser altimetry system the processing of raw data challenge emerges. including calibration aspects and error analysis follows. The last section deals with the derivation of a DEM in the Jakob- Laser altimetry provides a solution for precise mapping and shavns drainage basin from laser altimetry data and its compari- monitoring of polar regions. In NASA’s Arctic Ice Mapping son with a photogrammetrically derived DEM. 42 International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996 2. LAS] Satellite study th cal reso. craft by length c order of tude of directio: GLAS : attitude 2.1 Ana The ran from th estimate derive c ness an essentia laser foc beam c« detected noise. In spec laser alt expresse approac timetry Height (meters) 0.1 0.( 0.C Volts 0.C 0.C 0. Figur

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