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Ice Drift Tracking Using Photogrammetric Methods on Radar

IP.com Disclosure Number: IPCOM000248020D
Publication Date: 2016-Oct-18
Document File: 6 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

Ice drift measurements are needed to support ice management and navigation in arctic and sub-arctic regions where pack ice and or/or icebergs are present. A method is proposed to provide real time measurement of drift during operations, or to analyze historical radar records. The method measures ice movement by applying photogrammetric feature detection and matching algorithms to marine radar and synthetic aperture radar satellite data.

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Ice drift tracking using photogrammetric methods on radar

Abstract

Ice drift measurements are needed to support ice management and navigation in arctic and sub-arctic regions where pack ice and or/or icebergs are present. A method is proposed to provide real time measurement of drift during operations, or to analyze historical radar records. The method measures ice movement by applying photogrammetric feature detection and matching algorithms to marine radar and synthetic aperture radar satellite data.

Keywords

arctic, ice, ice drift, ice management, ice navigation, marine radar, synthetic aperture radar

Problem Description

Ice drift measurements are needed to support ice management and navigation in arctic and sub-arctic regions where pack ice and or/or icebergs are present. A method is proposed to provide real time measurement of drift during operations, or to analyze historical radar records.

Local ice drift measurements can be extracted from marine radar data to support forecasting of ice drift; position icebreaking or ice navigation resources including icebreakers or other ice going vessels; and to understand ice loads on structures. Regional ice drift measurements can be extracted from satellite synthetic aperture radar (SAR) date to understand regional ice drift movement and forecast future events. In both cases, the method provides ice drift information through non-contact measurements and reduces or eliminates the need for deployment of physical drift recording devices (GPS beacons).

Solution Applied to Marine Radar

The method uses feature detection algorithms from photogrammetric applications/software to detect and match point features in successive radar images. Here, the positions of the point features in successive marine radar images are then combined with the recorded known movement of the ship hosting the marine radar device to calculate the drift of the ice visible to the marine radar.

Example output from the method is shown in Figures 1 through 3. In this example, PhotoModeler Scanner (PhotoModeler 2016) software is applied to radar images collected using Rutter Ice Enhanced Marine Radar (Rutter 2016). It may be possible to use other photogrammetric algorithms and/or software. Likewise, it may be possible to use other marine radar systems or imagery.


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Figure 1 shows point features detected and matched in radar images collected 2.5 minutes apart. The movement of the point features in pixels is determined by comparing the positions in the 2 images (starting and ending location of each point feature). The calculated movement can then be scaled to other units (e.g. meters) through knowledge of the marine radar image dimensions. Additional analysis can then be performed to compute the average movement or other statistical measures.

Figure 2 and 3 show example output from the method applied to one hour of marine radar data. The method results in a measurement of the ice's position with respect to the movin...