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Technical Report Southeast Greenland Glaciers 2016

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Technical Report Southeast Greenland Glaciers 2016 Technical Report Southeast Greenland Glaciers 2016 for Eric Rignot Chancellor Professor, Earth System Science, School of Physical Sciences, University of California Irvine and Senior Research Scientist, NASA's Jet Propulsion Laboratory, Radar Science and Engineering Sander Geophysics Limited 260 Hunt Club Road Ottawa, ON Canada K1V 1C1 Tel: +1 613.521.9626 Fax: +1 613.521.0215 www.sgl.com Table of Contents i TABLE OF CONTENTS 1.EXECUTIVE SUMMARY................................................................................................1 2.INTRODUCTION............................................................................................................2 Project Brief......................................................................................................................3 3.SURVEY AREA..............................................................................................................5 Survey Area Map................................................................................................................5 Survey Boundary................................................................................................................8 4.SURVEY SPECIFICATIONS........................................................................................10 Data Recording................................................................................................................10 Technical Specifications.....................................................................................................10 Flight Line Specifications....................................................................................................10 Terrain Clearance.............................................................................................................11 5.SURVEY EQUIPMENT.................................................................................................12 Airborne Navigation and Data Acquisition System..................................................................12 Airborne Gravity System....................................................................................................12 Reference Station Acquisition System..................................................................................12 Reference Station and Airborne Acquisition System GPS Receivers...........................................13 Altimeters.......................................................................................................................13 Survey Aircraft.................................................................................................................14 Data Processing Hardware and Software..............................................................................14 6.SYSTEM TESTS..........................................................................................................15 Gravity System Tests........................................................................................................15 Gravimeter Calibration..................................................................................................15 Kulusuk......................................................................................................................15 Narsarsuaq.................................................................................................................15 Altimeter System, Position And Digital Terrain Model Tests.....................................................16 Laser Altimeter Calibration............................................................................................16 7.FIELD OPERATIONS...................................................................................................18 Reference Stations............................................................................................................19 Re-flights........................................................................................................................19 Field Personnel.................................................................................................................19 8.DIGITAL DATA COMPILATION....................................................................................20 Gravity Data....................................................................................................................21 Line Adjustments and Gridding.......................................................................................22 Gridding and Filtering...................................................................................................22 Positional Data.................................................................................................................23 Laser Altimeter Data.........................................................................................................25 9.FINAL PRODUCTS......................................................................................................26 Gravity Line Data Format...................................................................................................26 Digital Grids.....................................................................................................................27 SANDER GEOPHYSICS ii Table of Contents LIST OF FIGURES Figure 1: Survey Area and Flight Lines, Blocks one to five........................................................6 Figure 2: Survey Area and Flight Lines, Blocks five to ten.........................................................7 Figure 3: Pre and post flight ground gravity static measurements with respect to the local gravity value..............................................................................................................................16 Figure 4: Altimeter test.....................................................................................................17 Figure 5: Gravity data processing flowchart..........................................................................20 Figure 6: Positional data processing flowchart.......................................................................23 LIST OF TABLES Table 1: Survey Boundary – Block 1 Ikertivaq Glacier (datum WGS-84)......................................8 Table 2: Survey Boundary – Block 2 Koge Bugt Glacier (datum WGS-84)....................................8 Table 3: Survey Boundary – Block 3 Glaulv & Gyldenlove Glaciers (datum WGS-84).....................8 Table 4: Survey Boundary – Block 4 Bernstorff Gletscher Glacier (datum WGS-84)......................8 Table 5: Survey Boundary – Block 5 Skinfaxe & Rimfaxe Glaciers (datum WGS-84)......................8 Table 6: Survey Boundary – Block 6 Tingmiarmiut Fjord & Mogens Heinesen Glaciers (datum WGS- 84)...................................................................................................................................9 Table 7: Survey Boundary – Block 7 Puisortoq Glacier (datum WGS-84).....................................9 Table 8: Survey Boundary – Block 8 Anorituup Kangerlua Glacier (datum WGS-84)......................9 Table 9: Survey Boundary – Block 9 Qajuuttap Sermia Glacier (datum WGS-84)..........................9 Table 10: Survey Boundary – Block 10 Eqalorutsit Killiit Sermiat Glacier (datum WGS-84)............9 Table 11: Flight Lines Specification......................................................................................10 Table 12: Aircraft parking locations.....................................................................................18 Table 13: Locations of reference stations.............................................................................19 Table 14: Survey field crew................................................................................................19 Table 15: Ellipsoid parameters for WGS-84..........................................................................24 Table 16: Projection parameters for EPSG 3413....................................................................24 Table 17: Gravity line data channels and format....................................................................26 Table 18: Delivered digital grids.........................................................................................27 LIST OF PICTURES Picture 1: Typical scenery found in the survey area in sourtheastern Greenland...........................2 Picture 2: Local seabirds in southeastern Greenland................................................................2 Picture 3: Local scenery in sourtheastern Greenland................................................................5 Picture 4: View of the town of Kulusuk from the survey aircraft.................................................5 Picture 5: Iceberg near the survey area in southeastern Greenland..........................................11 Picture 6: GPS antennas on the roof in Kulusuk.....................................................................13 Picture 7: Preparing for take-off..........................................................................................14 Picture 8: The survey helicopter landing in Narsarsuaq...........................................................18 SANDER GEOPHYSICS Table of Contents iii Appendix I. Sander Geophysics Company Profile II. Planned Survey Lines III. Flown Survey Lines IV. Survey Equipment List V. Weekly Reports SANDER GEOPHYSICS Southeast Greenland Glaciers 2016 1 1. EXECUTIVE SUMMARY Sander Geophysics Limited (SGL) conducted a high resolution gravimetric survey over
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