RADARSAT-2 order handling and mission planning

Morena, L C; Pearce, Cam; Olfert, L.; Elder, C.; Rolland, P.

doi:10.5589/m04-006

Cited by 5 publications

(4 citation statements)

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“…Data collection in left-looking mode limits data acquisition because the SAR needs to switch back and forth between the two modes along its orbit. Careful planning was required to avoid conflicts and maintain sensor health (Morena et al, 2004). To cover the entire area, two different modes were combined: (1) 85 tracks in standard 5 mode for the region between 78 • to 87 • S; and (2) 43 tracks in extended high 4 mode for South Pole and vicinity.…”

Section: Datamentioning

confidence: 99%

Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009

2012

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Abstract. We report changes in ice velocity of a 6.5 million km 2 region around South Pole encompassing the Filchner-Ronne and Ross Ice Shelves and a significant portion of the ice streams and glaciers that constitute their catchment areas. Using the first full interferometric synthetic aperture radar (InSAR) coverage of the region completed in 2009 and partial coverage acquired in 1997, we processed the data to assemble a comprehensive map of ice speed changes between those two years. On the Ross Ice Shelf, our results confirm a continued deceleration of Mercer and Whillans Ice Streams with a 12-yr velocity difference of −50 m yr −1 (−16.7 %) and −100 m yr −1 (−25.3 %) at their grounding lines. The deceleration spreads 450 km upstream of the grounding line and more than 500 km onto the shelf, beyond what was previously known. Ross and Filchner Ice Shelves exhibit signs of pre-calving events, representing the largest observed changes, with an increase in speed in excess of +100 m yr −1 in 12 yr. Other changes in the Ross Ice Shelf region are less significant. The observed changes in glacier speed extend on the Ross Ice Shelf along the ice streams' flow lines. Most tributaries of the Filchner-Ronne Ice Shelf show a modest deceleration or no change between 1997 and 2009. Slessor Glacier shows a small deceleration over a large sector. No change is detected on the Bailey, Rutford, and Institute Ice Streams. On the Filchner Ice Shelf itself, ice decelerated rather uniformly with a 12-yr difference in speed of −50 m yr −1 , or −5 % of its ice front speed, which we attribute to a 12 km advance in its ice front position. Our results show that dynamic changes are present in the region. They highlight the need for continued observation of the area with a primary focus on the Siple Coast. The dynamic changes in Central Antarctica between 1997 and 2009 are generally second-order effects in comparison to losses on glaciers in the Bellingshausen and Amundsen Seas region and on the Antarctic Peninsula. We therefore conclude that the dynamic changes shown here do not have a strong impact on the mass budget of the Antarctic continent.

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Section: Datamentioning

confidence: 99%

Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009

2012

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“…greater than 30 degrees (Ulaby and Dobson 1989, Brisco et al 1992, McNairn and Brisco 2004. These values are well below the noise floor predicted for RADARSAT-2 (Morena et al 2004, Uher et al 2004.…”

Section: Soil Moisture Estimationmentioning

confidence: 84%

“…Table 2 provides an outline of the RADARSAT-2 modes of operation with the new imaging modes highlighted. For a more detailed description of RADARSAT-2 see the papers by Uher et al (2004), and Morena et al (2004) and the MDA or CSA websites (http://www.radarsat2.info/; http://www.space.gc.ca/asc/eng/satellites/radarsat2/).…”

Section: Radarsat-2 Innovationsmentioning

confidence: 99%

Water resource applications with RADARSAT-2 – a preview

Brisco¹,

Touzi²,

Sanden³

et al. 2008

International Journal of Digital Earth

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Fresh water is arguably the most vital resource for many aspects of a healthy and stable environment. Monitoring the extent of surface water enables resource managers to detect perturbations and long term trends in water availability, and set consumption guidelines accordingly. Potential end-users of water-related observations are numerous and reflect society as a whole. They encompass scientists and managers at all levels of government, aboriginal groups, water/ power utility managers, farmers, planners, engineers, hydrologists, medical researchers, climate scientists, recreation enthusiasts, public school to postgraduate students, many special interest groups and the general public. Water data and analyses generate information products that benefit water resources planning and management, engineering design, plant operations, navigation activities, health research, water quality assessments and ecosystem management. As well, they serve as inputs for flood and drought warnings and weather and climate prediction models. Radar data in general, and RADARSAT in particular, are very good for detecting open surface water and have been used operationally for flood monitoring in many countries. Significant radar data archives now exist to analyse seasonal, annual and decadal trends, in order to attain a better understanding of the freshwater cycle. Radar data are also useful for wetland classification and soil moisture estimation. With the increasing pressure on water resources, both from a quality as well as a quantity perspective, the need will continue to increase for reliable information.RADARSAT-2 has several innovations that will enhance the ability to provide useful information about water resources. This paper provides an overview of the use of radar in general, and RADARSAT-2 in particular, for the generation of information products useful to water resource managers.

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“…Careful planning was required to avoid conflicts and maintain sensor health (Morena et al, 2004). To cover the entire area, two different modes were combined: (1) 85 tracks in Standard 5 mode for the region between 78 • to 87 • S; and (2) 43 tracks in Extended High 4 mode for South Pole and vicinity.…”

Section: Datamentioning

confidence: 99%

Twelve years of ice velocity change in Antarctica observed by RADARSAT-1 and -2 satellite radar interferometry

Scheuchl¹,

Mouginot²,

Rignot³

2012

Preprint

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We report changes in ice velocity of a 6.5 million km2 region around South Pole encompassing the Ronne/Filchner and Ross Ice Shelves and a significant portion of the ice streams and glaciers that constitute their catchment areas. Using the first full interferometric synthetic-aperture radar (InSAR) coverage of the region completed in 2009 and partial coverage acquired in 1997, we process the data to assemble a comprehensive map of ice velocity changes with a nominal precision of detection of &pm;3–4 m yr–1. The largest observed changes, an increase in speed of 100 m yr–1 in 12 yr, are near the frontal regions of the large ice shelves and are associated with the slow detachment of large tabular blocks that will eventually form icebergs. On the Ross Ice Shelf, our data reveal a slow down of Mercer and Whillans Ice Streams with a 12 yr velocity difference of 50 m yr–1 (16.7 %) and 100 m yr–1 (25.3 %) at their grounding lines. The slow down spreads 450 km upstream of the grounding line and more than 500 km onto the shelf, i.e., far beyond what was previously known. Also slowing in the Ross Ice Shelf sector are MacAyeal Ice Stream and Byrd Glacier with a 12 yr velocity difference near their grounding lines of 30 m yr–1 (6.7 %) and 35 m yr–1 (4.1 %), respectively. Bindschadler Ice Stream is faster by 20 m yr–1 (5 %). Most of these changes in glacier speed extend on the Ross Ice Shelf along the ice streams' flow lines. At the mouth of the Filchner/Ronne Ice Shelves, the 12 yr difference in glacier speed is below the 8 % level. We detect the largest slow down with a 12 yr velocity difference of up to 30 m yr–1 on Slessor and Recovery Glaciers, equivalent to 6.7 % and 3.3 %, respectively. Foundation Ice Stream shows a modest speed up (30 m yr–1 or 5 %). No change is detected on Bailey, Rutford, and Institute Ice Streams. On the Filchner Ice Shelf proper, ice slowed down rather uniformly with a 12 yr velocity difference of 50 m yr–1, or 5 % of its ice front speed, which we attribute to an 12 km advance in its ice front position. Overall, we conclude that the ice streams and ice shelves in this broad region, in contrast with their counterparts in the Amundsen and Bellingshausen seas, exhibit changes in ice dynamics that have almost no impact on the overall ice balance of the region

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RADARSAT-2 order handling and mission planning

Cited by 5 publications

References 0 publications

Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009

Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009

Water resource applications with RADARSAT-2 – a preview

Twelve years of ice velocity change in Antarctica observed by RADARSAT-1 and -2 satellite radar interferometry

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