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Antarctic-Wide Annual Ice Flow Maps from Landsat 8 Imagery between 2013 and 2019 (2020)

Shen, Qiang ; Wang, Hansheng ; Shum, C K ; [et al.]

PANGAEA

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Publication Date: 2024-01-13

Description: This dataset includes annual mosaics of Antarctic ice velocity derived from Landsat 8 images between December, 2013 and April, 2019, which was updated in 2020 in order to produce multi-year annual ice velocity mosaics and improve the quality of products including non-local means (NLM) filter, and absolute calibration using rock outcrops data. The resulting Version 2 of the mosaics offer reduced local errors, improved spatial resolution as described in the README file.

Keywords: Antarctica; File content; ice velocity; Landsat8; pan-Antarctica; Uniform resource locator/link to file

Type: Dataset

Format: text/tab-separated-values, 56 data points

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2

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Improved Antarctic-Wide Ice Flow Maps from Landsat 8 Imagery (2019)

Shen, Qiang ; Wang, Hansheng ; Shum, C K ; [et al.]

PANGAEA

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Publication Date: 2024-01-13

Description: Here, we present a methodology which can automatically calibrate, mosaic, and post-process Landsat images into displacement maps, resulting in seamless, continent-wide, ice velocity products. Using this developed methodology, we have assembled over 200,000 displacement maps to generate Antarctic-wide annual mosaics of ice velocity maps from more than 70,000 Landsat 8 images acquired between December 2013 and April 2019. The new suite of annual Antarctic ice velocity maps at 105-m grid spacing provide the clearest picture of Antarctic-wide ice flow to-date, and error analysis via comparisons with various available prior ice velocity data products and in situ data confirmed the improved accuracy of this new data product.

Keywords: Antarctica; File content; ice velocity; Landsat8; pan-Antarctica; Uniform resource locator/link to file

Type: Dataset

Format: text/tab-separated-values, 56 data points

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3

Electronic Resource

Robust estimation of systematic errors of satellite laser range (1999)

Yang, Y. ; Cheng, M. K. ; Shum, C. K. ; [et al.]

Springer

Journal of geodesy 73 (1999), S. 345-349

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ISSN: 1432-1394

Keywords: Key words. Robust fitting ; Systematic errors ; SLR

Source: Springer Online Journal Archives 1860-2000

Topics: Architecture, Civil Engineering, Surveying

Notes: Abstract. Methods for analyzing laser-ranging residuals to estimate station-dependent systematic errors and to eliminate outliers in satellite laser ranges are discussed. A robust estimator based on an M-estimation principle is introduced. A practical calculation procedure which provides a robust criterion with high breakdown point and produces robust initial residuals for following iterative robust estimation is presented. Comparison of the results from the least-squares method with those of the robust method shows that the results of the station systematic errors from the robust estimator are more reliable.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s001900050252

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4

Electronic Resource

Seasonal sea level change from TOPEX/Poseidon observation and thermal contribution (2000)

Chen, J. L. ; Shum, C. K. ; Wilson, C. R. ; [et al.]

Springer

Journal of geodesy 73 (2000), S. 638-647

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ISSN: 1432-1394

Keywords: Key words: TOPEX/Poseidon – Sea-level change – Thermal effect

Source: Springer Online Journal Archives 1860-2000

Topics: Architecture, Civil Engineering, Surveying

Notes: Abstract. Seasonal steric sea-level change due to temperature variation in the mixing layer is assessed using space-measured sea-surface temperature data and historical in situ temperature measurements. The results are compared with TOPEX/Poseidon satellite altimeter measurement at different large spatial scales. It is indicated that thermal effect accounts for much of the observed seasonal variability, especially when averaging over zonal regions. Some regional seasonal patterns of sea-level anomalies in the tropical oceans are well represented by the thermal model prediction. Systematic differences are shown between TOPEX/Poseidon observation and thermal contribution at a 1–2 cm level. The potential causes for these differences are discussed, including water mass exchanges among the atmosphere, land, and oceans, and error sources in the steric result and geophysical corrections applied in TOPEX/Poseidon data.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s001900050002

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The 26 December 2004 tsunami source estimated from satellite radar altimetry and seismic waves (2005)

Yi, Yuchan ; Song, Tony Y. ; Zlotnicki, Victor ; [et al.]

In: Other Sources

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Publication Date: 2018-06-11

Description: The 26 December 2004 Indian Ocean tsunami was the first earthquake tsunami of its magnitude to occur since the advent of both digital seismometry and satellite radar altimetry. Both have independently recorded the event from different physical aspects. The seismic data has then been used to estimate the earthquake fault parameters, and a three-dimensional ocean-general-circulation-model (OGCM) coupled with the fault information has been used to simulate the satellite-observed tsunami waves. Here we show that these two datasets consistently provide the tsunami source using independent methodologies of seismic waveform inversion and ocean modeling. Cross-examining the two independent results confirms that the slip function is the most important condition controlling the tsunami strength, while the geometry and the rupture velocity of the tectonic plane determine the spatial patterns of the tsunami.

Keywords: Communications and Radar

Type: Geophysical Research Letters; Volume 32; L20601

Format: text

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OCEANESIP: Accurate TOPEX/Poseidon Residuals, Alongtrack or Gridded, and AVHRR/Reynolds Sea Surface Temperatures, with Online Subsetting and Plotting (2000)

Shum, C. ; Raskin, R. ; Urban, T. ; [et al.]

In: Other Sources

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Publication Date: 2018-06-08

Keywords: Oceanography

Type: Joint TOPEX/Poseidon and Jason-1 Science Working Team; Miami, FL; United States

Format: text

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Tidal simulation using regional ocean modeling systems (ROMS) (2006)

Li, Zhijin ; Shum, C. K. ; Dong, Changming ; [et al.]

In: Other Sources

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Publication Date: 2019-07-13

Description: The purpose of our research is to test the capability of ROMS in simulating tides. The research also serves as a necessary exercise to implement tides in an operational ocean forecasting system. In this paper, we emphasize the validation of the model tide simulation. The characteristics and energetics of tides of the region will be reported in separate publications.

Keywords: Communications and Radar

Type: 15 Years of Progress in Radar Altimetry, Venice, Italy; Mar 13, 2006 - Mar 18, 2006

Format: text

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