All posts by msalmani

Ice Sheet Mass Balance

March 19, 2024Researchmsalmani

Investigating mass balance changes of Greenland and Antarctic ice sheets by using remote sensing and geodetic measurements.

Projects

Collaborative research: IPY: POLENET/Greenland: Using bedrock geodesy to constrain past and present day changes in Greenland’s ice mass. Michael Bevis, Bea Csatho, NSF-OPP, 2007 – 2009.

Selected Publications and Presentations

Spikes, V. B., B. M. Csatho G. S. Hamilton and I. M. Whillans, 2003, Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimetry measurements. Journal of Glaciology, 49(165), 223-230.
Spikes, V. B., B. Csatho, and I. Whillans, 2003 Laser profiling over Antarctic ice streams: methods and accuracy. Journal of Glaciology, 49(165), 315-322.
Filin, S., and B. Csatho, 2002. Improvement of elevation accuracy for mass balance monitoring using in-flight laser calibration. Annals of Glaciology, 34, 330-334.
Thomas, R., B. Csatho, C. Davis, C. Kim, W. Krabill, S Manizade, J. McConnell, and J. Sonntag, 2001. Mass balance of higher-elevation parts of the Greenland ice sheet. J. Geophys. Res., 106(D24), 33,707-33,716 (2001JD900033).
Thomas, R., T. Akins, B. Csatho, M. Fahnestock, P. Gogineni, C. Kim, and J. Sonntag, 2000. Mass balance of the Greenland ice sheet at high elevations. Science, 289(5478), 426-428.

ICESat Satellite Laser Altimetry

March 19, 2024Researchmsalmani

Satellite laser altimetry for mapping surface topography and monitoring mass balance changes of Greenland and Antarctic ice sheets
Calibration and validation of ICESat data products

Antarctic outlet glaciers — Jakobshavn Glacier Greenland

Projects

Long-term mass balance of the Pacific ocean sector of Antarctica based on multisensor fusion. B. Csatho, T. Schenk and C. J. van der Veen, NASA, 2006 – 2009.
Research Support for R. H. Thomas Science Team member for the Geosciences Laser Altimeter System (GLAS). B. Csatho and D. Bromwich. NASA, 1998 – 2005.

Selected Publications and Presentations

Csatho, B., Y. Ahn, T. Yoon, C.J. van der Veen, S. B. Spikes, G. Hamilton, D. Morse, and S. Vogel, 2005. ICESat measurements reveal complex patterns of thickness changes on Siple Coast ice streams, Antarctica. Geophysical Research Letters, 32, L23S04, doi:1029/2005GL024289.
Schenk, T., B. Csatho, C.J. van der Veen, Y. Ahn and T. Yoon, 2005. Registering imagery to ICESat data for monitoring elevation changes on Byrd Glacier, Antarctica. Geophysical Research Letters, 32, L23S05, doi:10.1029/2005GL024328.
Csatho, B. M., editor, 1999. Proceedings of Joint workshop of ISPRS WG III/5 and III/2 on Mapping surface structure and topography by airborne and spaceborne lasers, International Archives of Photogrammetry and Remote Sensing, 32(3 W14), 214 pages.

Remote Sensing of Polar Landscapes

March 19, 2024Researchmsalmani

Mapping and monitoring glacial geomorphology, permafrost and soil distribution from remotely sensed data.

Projects

Reconstruction of the history of Greenland outlet glaciers since the Little Ice Age. B. Csatho, T. Schenk and C.J. van der Veen, NASA, 2006 – 2007.
Pilot study for using ASTER images to map glacial geomorphology. C.J. van der Veen, B. Csatho, NASA, 2004 – 2005.
Investigating long-term behavior of outlet glaciers in Greenland. B. Csatho, T. Schenk and C. J. van der Veen, NASA, 2003 – 2004.

Selected Publications and Presentations

Csatho, B.M., C. Ping, L.R. Everett, J.M. Kimble, G. Michaelson and C. Tremper, 2006. Characterizing frozen ground with multisensor remote sensing. Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract C13A-01. (pdf)
van der Veen, C.J. and B. Csatho, 2005. Spectral characteristics of Greenland lichens. Geographie et Physique Quaternaire, 59(1), 63-73.
Csatho, B., C.J. van der Veen and C. Tremper, 2005. Trimline mapping from multispectral Landsat ETM+ imagery. Geographie et Physique Quaternaire, 59(1), 49-62.
Csatho, B., T. Schenk, W. Krabill, T. Wilson, W. Lyons, G. McKenzie, C. Hallams, S. Manizade and T. Paulsen, 2005. Airborne laser scanning for high-resolution mapping of Antarctica. EOS, 86(25), 237-238.
Csatho, B., J. Kimble, C. Tremper, L. Everett and Y. Ahn, 2004. Toward mapping soils and geomorphology by remote sensing: an example of multi-sensor data fusion from the Dry Valleys. Antarctic Permafrost Workshop, Madison, WI, November 14-18, 2004. (jpg)

Surface velocities of a Greenland outlet glacier from high-resolution visible satellite imagery

March 19, 2024Researchmsalmani

Abstract: A multidisciplinary team of researchers reports the results of a study of the feasibility of utilizing high-resolution Declassified Intelligence Satellite Photographs (DISP) to derive surface speeds of fast-moving Greenland outlet glaciers from tracking surface features on sequential DISP images. The images provide coverage of the entire Greenland Ice Sheet for most of the 1960s and their value as a resource for establishing a baseline for assessing ongoing and future changes in the ice sheet is demonstrated.

DISP Image of Kangerdlugssuaq Glacier, east Greenland

Location map — DISP Image of Kangerdlugssuaq Glacier, east Greenland

REFERENCE

Csatho, B. M., J. F. Bolzan, C. J. van der Veen, A. F. Schenk, D-C. Lee, “Surface Velocities of a Greenland outlet glacier from high-resolution visible satellite imagery,” Polar Geography, 1999,23, No.1, pp.71-82. (pdf)

DEM generation from airborne LIDAR data, McMurdo Dry Valleys, Antarctica

March 19, 2024ResearchDatamsalmani

The McMurdo Dry Valleys, covering about 4,800 km², at 76°30’78°30’S, 160-164°E, constitute the largest continuous ice-free ground in Antarctica. It is a hyper-arid, cold polar desert, containing a variety of landscapes, including perennially ice-covered lakes, ephemeral streams, glaciers, and extensive areas of soils and exposed bedrock. Geomorphologic mapping and landscape interpretation provide key information toward understanding the climate evolution of the Dry Valley region, which has important implications for the stability of the east Antarctic ice sheet. (see site map for orientation).

Looking east across Eastern Taylor Valley, in the background you can see Mount Erebus

During the 2001-02 Austral summer, NASA/GSFC, NSF Polar Program, and USGS joined forces to collect high-resolution ALS data over several sites in the McMurdo Dry Valleys area of southern Victoria Land, Antarctica, using NASA’s Airborne Topographic Mapper (ATM) laser altimetry system. The prime motivation was to evaluate the potential of ALS topographic mapping in Antarctica and to establish calibration/validation sites for NASA’s ICESat (Ice, Cloud, and land Elevation Satellite) altimeter mission. Data were collected and processed by NASA’s ATM group. The second data processing phase, called as laser point post-processing, was carried out at the Ohio State University.
Researchers from the Byrd Polar Research Center and the Digital Photogrammetry Laboratory developed unique methods to analyze the raw laser points, to detect and eliminate outliers, and to interpolate a Digital Elevation Model (DEM) from the irregularly distributed laser points. Different visualization methods are used to represent the surface in a suitable fashion for researchers to analyze the different landscapes. For example, presenting the topography as shaded relief perspective view reveals how well the topographic details have been captured by the airborne laser scanning mission and encoded in the DEM (Canada glacier). This website showcases a few geomorphologic applications that greatly benefit from the high-resolution topographic data. The full data set (that includes the DEMs, label files, and original laser points) is distributed by USGS through the Antarctic Digital Atlas.

Download the DEM of Taylor valley data 1 here
Download the DEM of Taylor valley data 2 here