Observation of sea-ice dynamics using synthetic aperture radar images: automated analysis
67
Citation
8
Reference
10
Related Paper
Citation Trend
Abstract:
Two techniques for automated sea-ice tracking, image pyramid area correlation (hierarchical correlation) and feature tracking, are described. Each technique is applied to a pair of Seasat SAR sea-ice images. The results compare well with each other and with manually tracked estimates of the ice velocity. The advantages and disadvantages of these automated methods are pointed out. Using these ice velocity field estimates it is possible to construct one sea-ice image from the other member of the pair. Comparing the reconstructed image with the observed image, errors in the estimated velocity field can be recognized and a useful probable error display created automatically to accompany ice velocity estimates. It is suggested that this error display may be useful in segmenting the sea ice observed into regions that move as rigid plates of significant ice velocity shear and distortion.< Keywords:
Distortion (music)
Feature (linguistics)
Tracking (education)
Cite
Gravity measurement is of great importance to the height datum in Antarctica. The absolute gravity measurement was carried out at Great Wall Station, Antarctica, using FG5 absolute gravity instrument. The gravity data was processed with corrections of earth tide, ocean tide, polar motion and the atmospher, and the RMS is within ±3×10 -8 ms -2 . The vertical and horizontal gravity gradients were measured using 2 LaCoaste & Romberg (LCR) gravimeters. The absolute gravity measurement provides the fundamental data for the validation and calibration of the satellite gravity projects such as CHAMP, GRACE and GOCE, and for the high accuracy geoid model.
Gravimeter
Polar motion
Cite
Citations (0)
Synthetic aperture radar (SAR) remote sensing ofthe ocean from space in China began in the early 1990s. This paper presents the research and marine applications of synthetic aperture radar technique in China. Research activities in SAR remote sensing range from basic research to technique development. Basic research has been focused on studies of SAR imaging mechanisms. Technique development has been given to methodology for extracting information about sea surface waves internal waves water bottom topography and ship detection. Applications of SAR data include the study of oceanic phenomena and coastal environmental monitoring. Some examples are presented. Future research and applications are discussed.
Cite
Citations (0)
A method for Positron Emission Particle Tracking (PEPT) based on optical feature point identification techniques is demonstrated for use in low activity tracking experiments. A population of yeast cells of approximately 125,000 members is activated to roughly 55 Bq/cell by 18F uptake. An in vitro particle tracking experiment is performed with nearly 20 of these cells after decay to 32 Bq/cell. These cells are successfully identified and tracked simultaneously in this experiment. This work extends the applicability of PEPT as a cell tracking method by allowing a number of cells to be tracked together, and demonstrating tracking for very low activity tracers.
Tracking (education)
Particle (ecology)
Positron emission
Cite
Citations (10)