ICESat Altimetry Data Product Verification at White Sands Space Harbor

Magruder, Lori A.; Webb, C. E.; Urban, T.; Silverberg, E. C.; Schutz, B. E.

doi:10.1109/tgrs.2006.885070

Cited by 59 publications

(35 citation statements)

References 6 publications

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“…This data product release corresponds to a radial orbit determination accuracy of 2 cm and surface laser spot location knowledge with <5 m horizontal accuracy. Observed singleshot elevation accuracy is less than 10 cm with a precision under best conditions of 2-3 cm (Magruder et al 2007).…”

Section: Icesat Processingmentioning

confidence: 88%

A comparison of coincident GRACE and ICESat data over Antarctica

Gunter

Urban

Riva

et al. 2009

J Geod

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In this study, we present a comparison of coincident GRACE and ICESat data over Antarctica. The analysis focused on the secular changes over a 4-year period spanning from 2003 to 2007, using the recently reprocessed and publicly available data sets for both missions. The results show that the two independent data sets possess strong spatial correlations, but that there are several factors that can significantly impact the total derived ice mass variability from both missions. For GRACE, the primary source of uncertainty comes from the modelling of glacial isostatic adjustment, along with the estimates of C 2,0 and the degree one terms. For ICESat, it is shown that assumptions about firn density, rate biases, and the sampling interval of the various laser campaigns can have large effects on the results. Despite these uncertainties, the similarities that do exist indicate a strong potential for the future refinement of both GIA and mass balance estimates of Antarctica.

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Section: Icesat Processingmentioning

confidence: 88%

A comparison of coincident GRACE and ICESat data over Antarctica

Gunter

Urban

Riva

et al. 2009

J Geod

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“…The TanDEM-X DEM is expected to provide 10 m absolute and 2-4 m relative vertical accuracy (Gonzalez et al, 2010). ICESat altimeter data are accurate to ∼ 0.3 m in the vertical (Magruder et al, 2007). The accuracy of radargrammetry changes with topography, accuracy of correlation and orbit accuracy, and is expected to be of the order of 10-50 m (Balik et al, 2004;Balz et al, 2009Balz et al, , 2013.…”

Section: Digital Elevation Model (Dem)mentioning

confidence: 99%

Surface velocity and mass balance of Livingston Island ice cap, Antarctica

Osmanoǧlu

Navarro²,

Hock

et al. 2014

The Cryosphere

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Abstract. The mass budget of the ice caps surrounding the Antarctica Peninsula and, in particular, the partitioning of its main components are poorly known. Here we approximate frontal ablation (i.e. the sum of mass losses by calving and submarine melt) and surface mass balance of the ice cap of Livingston Island, the second largest island in the South Shetland Islands archipelago, and analyse variations in surface velocity for the period 2007-2011. Velocities are obtained from feature tracking using 25 PALSAR-1 images, and used in conjunction with estimates of glacier ice thicknesses inferred from principles of glacier dynamics and ground-penetrating radar observations to estimate frontal ablation rates by a flux-gate approach. Glacier-wide surface mass-balance rates are approximated from in situ observations on two glaciers of the ice cap. Within the limitations of the large uncertainties mostly due to unknown ice thicknesses at the flux gates, we find that frontal ablation (−509± 263 Mt yr −1 , equivalent to −0.73 ± 0.38 m w.e. yr −1 over the ice cap area of 697 km 2 ) and surface ablation (−0.73 ± 0.10 m w.e. yr −1 ) contribute similar shares to total ablation (−1.46 ± 0.39 m w.e. yr −1 ). Total mass change (δM = −0.67 ± 0.40 m w.e. yr −1 ) is negative despite a slightly positive surface mass balance (0.06± 0.14 m w.e. yr −1 ). We find large interannual and, for some basins, pronounced seasonal variations in surface velocities at the flux gates, with higher velocities in summer than in winter. Associated variations in frontal ablation (of ∼ 237 Mt yr −1 ; −0.34 m w.e. yr −1 ) highlight the importance of taking into account the seasonality in ice velocities when computing frontal ablation with a flux-gate approach.

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“…GLA01 and GLA06 are the products used in this analysis. When fully calibrated, the global ICESat elevations are estimated to have an absolute accuracy of 2 to 7 cm and a precision of 2 to 3 cm at 40 Hz, tested over a variety of surfaces such as dry lakes and the Antarctic Dry Valleys Martin et al 2005;Magruder et al 2007). …”

Section: Icesat Datamentioning

confidence: 99%

A Survey of ICESat Coastal Altimetry Applications: Continental Coast, Open Ocean Island, and Inland River

Urban¹,

Schutz²,

Neuenschwander³

2008

Terr. Atmos. Ocean. Sci.

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ICESat satellite laser altimetry provides an unprecedented set of global elevation measurements of the Earth, yielding great detail over ice, land and ocean surfaces. Coastal regions in particular, including seamless land-water transitions, benefit from the small footprint (50 to 90 m), high resolution (40 Hz, ~170 m along-track), and high precision (2 to 3 cm) of ICESat. We discuss the performance and character of ICESat data in three example coastal scenarios: continental coast (Louisiana-Mississippi Gulf Coast, USA, including Lake Pontchartrain), open ocean island (Funafuti, Tuvalu), and an inland river (confluence of Tapajos and Amazon rivers, Brazil). Water elevations are compared to tide gauge heights and to TOPEX and Jason-1 radar altimetry. In demonstrating the utilization of ICESat, we also present examples of: laser waveform shapes over a variety of surface types (water, land, and vegetation); vegetation canopy heights (detecting large-scale destruction from Hurricane Katrina comparing data before and after); sub-canopy surface water; measurements of waves; and examination of along-stream river slope and comparisons of river stage to hydrologically-driven GRACE geoid change.

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ICESat Altimetry Data Product Verification at White Sands Space Harbor

Cited by 59 publications

References 6 publications

A comparison of coincident GRACE and ICESat data over Antarctica

A comparison of coincident GRACE and ICESat data over Antarctica

Surface velocity and mass balance of Livingston Island ice cap, Antarctica

A Survey of ICESat Coastal Altimetry Applications: Continental Coast, Open Ocean Island, and Inland River

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