Charles Randell's scientific contributions

Publications (11)

Article
Sea ice monitoring is an important field of scientific research and relevant to operational applications. One of the major engineering challenges in undertaking production developments in Arctic offshore regions is the frequent presence of extreme ice features that pose a hazard to facilities and surrounding subsea infrastructure. The information o...
Conference Paper
A remote sensing technique, based on processing satellite altimeter data, for iceberg detection was validated and implemented for operational iceberg monitoring. Algorithms for altimeter data preprocessing and analysis were developed to efficiently detect icebergs and eliminate false detections caused by signal noise and the presence of small islan...
Conference Paper
Two synthetic aperture radar (SAR) datasets with validated icebergs in sea ice were analyzed. A qualitative assessment of the data using false colour visualization methods for dual polarization SAR was conducted indicating that icebergs had an improved visually discernable signature from the background over single polarization SAR.A quantitative an...
Article
Characterization of the ice environment is an essential step in the probabilistic design approach of Arctic offshore structures. Uncertainty here could lead to overly conservative designs and higher than necessary cap-ex. Inclusion of an effective ice management strategy further mitigates risk and cost. Both tactical and historical knowledge of the...
Article
As the number of oil and gas players in Arctic and sub-Arctic regions increases, so do the suite of technology-based capabilities for cold region operations. Advances are being made in remote sensing, ice management, and ice engineering. R&D targeted to increase our understanding of the ice environment and ice mechanics is reducing uncertainties re...
Article
A review of the current capability within the industry is given for assessing the iceberg environment and iceberg keel / seabed structure interaction, with emphasis on operations relevant to the east coast of Canada. Consideration of calculating contact frequency and ice loads for iceberg keel impact is discussed, for both freely floating and gougi...
Article
Full-text available
This paper presents a comparison of existing algorithms to derive surface winds from synthetic aperture radar (SAR) satellites and investigates their use in drift forecasting for search and rescue purposes. Specifically, SAR-derived winds from RADARSAT-1 and ENVISAT advanced synthetic aperture radar (ASAR) data at 1.5 km resolution are compared wit...
Conference Paper
Spaceborne synthetic aperture radar (SAR), with its wide area coverage and all-weather operation, is an ideal sensor to provide iceberg surveillance in support of safe shipping and offshore operations. Reliable ship/iceberg discrimination in SAR imagery is at least as important as detection since misclassification can result in expending significan...
Conference Paper
This paper describes the culmination of a four-year research, application, and development program towards finding and quantifying a methodology for sensor and data fusion of remotely sensed targets. It builds on previous research reported in IGARSS'02 [1] and IGARSS'04 [2]. Here, we examine the effectiveness of the data fusion methodology, specifi...
Article
Dmitri Burakov Hydrological Forecasts Department, Krasnoyarsk Region, Russia Natalie Novik Northern Forum, Anchorage, Alaska C-CORE has been providing an operational Earth Observation (EO)-based river ice service using single polarized Synthetic Aperture Radar (SAR) imagery since 2003. Building on this experience, the capabilities of using dual-pol...

Citations

... The present state of the art in SARbased vessel and iceberg discrimination is the use of machine learning to train algorithms to distinguish between vessel and iceberg backscatter (see, for example [14]- [20]). Several of the authors have been involved in efforts to develop ship and iceberg classifier in different types of SAR imagery, starting initially with RADARSAT-1 (unpublished) and then to ENVISAT ASAR [14], [15], RADARSAT-2 [16], [18] and TerraSAR-X [17]. The most recent efforts [21] deal with discriminators trained for simulated data from RADARSAT Constellation Mission 1 , showing the benefits of compact polarimetry for target discrimination. ...
... Detection, classification, and tracking are the primary components of ice management systems (Randell et al. 2009). Once a threat has been identified, 27 active physical management is executed. ...
... As an important active microwave remote sensing instrument, the spaceborne microwave scatterometer can quickly obtain sea surface wind in all-time and all-weather condition, by observing the sea surface normalized radar cross section (NRCS, φ 0 ) in multiple azimuths. It is a main satellite remote sensing technique for retrieving sea surface wind field at present [3][4][5][6]. On 25 October 2018, the second Chinese ocean power environment satellite (HY-2B) was successfully launched, which is an advanced satellite and has collected a large amount of data for the retrieving the global sea surface wind field. ...
... The two sectors have also crossed paths before within the academic literature in ways that have yielded some important breakthroughs. Satellites are now being used to assess oil fires (Limaye et al., 1991), detect subsidence in oil fields (Fielding et al., 1998), measure oil spills (Brekke and Solberg, 2005;Macdonald et al., 1993), collect and transmit operational data from oil and gas fields (McCoy, 2009;Sann, 2011), and monitor the movement of icebergs that might potentially collide with offshore installations (Randell et al., 2011). ...
... In the context of the Arctic and Antarctic, harsh weather, dark polar 27 nights and excessive cloud cover in summer implies that radar and more specifically 28 synthetic aperture radar (SAR)is generally the preferred choice for ice monitoring 29 (Power et al. 2001). SAR is widely used by governments and industry to monitor iceberg locations in ice frequented waters (Randell et al. 2009). SAR is also used 1 extensively for vessel surveillance, as the applications are very similar, involving the 2 detection of bright backscatter on a clutter background. ...
... Refs. [14,15] applied a CFAR detector to SAR images and extracted small ship and iceberg images centered on the detection. Ref. [14] surveyed 19 large supply vessels and 20 icebergs and achieved an accuracy of 97% using a polarimetric area ratio threshold between the HV and HH polarization of the detections. ...
... Present management systems used for the Grand Banks have evolved gradually over the years and are now able to identify unique icebergs in most cases. The experience gained over the years has been adapted by Churchill et al. (2004Churchill et al. ( , 2006, who have developed an automated technique for the fusion of iceberg data from different sources. The approach is based on multiple hypothesis tracking and the CIS drift model outlined in Section 3.7.1. ...