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Trackline map and processing report for navigation sensors from Heincke HE409

Authors
Publisher
Alfred Wegener Institute
Publication Date
Disciplines
  • Computer Science

Abstract

Master Track RV Heincke HE409 Data Processing Report Contents 1 Introduction 1 2 Workflow 1 3 Sensor Layout 2 4 Processing Report 3 Contact: Dr. Rainer Knust Alfred Wegener Institute Columbusstrasse, D-27568 Bremerhaven, GERMANY Phone: +49(471)4831-1709 Fax: +49(471)4831-1918 Mail: [email protected] Processing Agency: FIELAX Gesellschaft für wissenschaftliche Datenverarbeitung mbH Schleusenstr. 14, D-27568 Bremerhaven, GERMANY Phone: +49 (0) 471 30015 0 Fax: +49 (0) 471 30015 22 Mail: [email protected] Ref.: HE409_nav.pdf Vers.: 1 Date: 2013/12/17 Status: final 1 Introduction This report describes the processing of raw data acquired by position sensors on board RV Heincke during expedition HE409 to receive a validated master track which is used as reference of further expedition data. 2 Workflow The different steps of processing and validation are visualized in fig. 1. Unvalidated data of up to three sensors and ship-motion data are extracted from the DAVIS SHIP data base (dship.awi.de) in 1-second interval. They are converted to ESRI point shapefiles and imported to a GIS. A visual screening is performed to evaluate data quality and remove outliers manually. The position data from each position sensor are centered to the destined master track origin by applying ship-motion data (angles roll, pitch, heading) and lever arms. For all three resulting position tracks, a quality check is performed using a ship’s speed filter and an acceleration filter. Filtered positions are flagged. Those position tracks are combined to a single master track depending on a sensor priority list (by accuracy, reliability) and availability / filter flag of data. Missing data up to a time span of 60 seconds are linearly interpolated. To reduce the amount of points for overview maps the master track is generalized by using the Ramer-Douglas-Peucker algorithm. This algorithm returns only the most significant points from the track. Full master track an

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