GUT
User Guide and Algorithm Descriptions
Reference : ESA-GUT-AD-001
Version : 2.0 page
Date : 09 Mar 2011 3/112
6 File Formats....................................................................................................25
6.1 GUT Internal File Formats........................................................................26
6.1.1 netCDF Grid Function........................................................................26
6.1.2 netCDF Track Function......................................................................28
6.1.3 netCDF Spherical Harmonic Function................................................28
6.1.4 netCDF Spherical Harmonic Potential...............................................30
6.1.5 netCDF Track, Grid and Reference Ellipsoid formats........................30
6.2 Support for GRAVSOFT, GRACE and EIGEN File Formats.........................30
6.3 GOCE Level-2 Product Files......................................................................31
7 Algorithms......................................................................................................31
7.1 Coordinate Systems and Transformations...............................................31
7.2 Grid Function Adaption............................................................................32
7.3 Geoid Height............................................................................................34
7.4 Gravity Anomaly......................................................................................37
7.5 Height Anomaly.......................................................................................38
7.6 Vertical Deflection North..........................................................................39
7.7 Vertical Deflection East............................................................................40
7.8 Geostrophic Velocity East........................................................................40
7.9 Geostrophic Velocity North......................................................................41
7.10 Geostrophic Velocity Along-Track..........................................................42
7.11 Mask-Based Substitution........................................................................44
7.12 Mask-Based Merge.................................................................................45
7.13 Spatial Filtering......................................................................................46
7.14 Spherical Harmonic Synthesis...............................................................48
7.15 Spherical Harmonic Expansion..............................................................50
7.16 Spectral Filtering....................................................................................51
8 Processing Units.............................................................................................52
8.1 ChangeFunctionDegreeAndOrder............................................................53
8.2 ChangeGridFunctionTideSystem..............................................................53
8.3 ChangePotentialDegreeAndOrder............................................................54
8.4 ChangePotentialTideSystem....................................................................55
8.5 ChangeSphericalHarmonicFunctionTideSystem......................................55
8.6 ChangeTrackFunctionReferenceEllipsoid.................................................56
8.7 ChangeTrackFunctionTideSystem............................................................56
8.8 CmdLineArgDegreeAndOrder..................................................................57
8.9 CmdLineArgDouble..................................................................................58
8.10 CmdLineArgFilter...................................................................................58
8.11 CmdLineArgGrid.....................................................................................58
8.12 CmdLineArgInputFileName....................................................................59
8.13 CmdLineArgInt.......................................................................................60
8.14 CmdLineArgLogicCmpOperator.............................................................60
8.15 CmdLineArgOptionalOutputFileName....................................................61
8.16 CmdLineArgOutputFileName.................................................................61
8.17 CmdLineArgPhysicalQuantity.................................................................62
8.18 CmdLineArgReferenceEllipsoid..............................................................63
8.19 CmdLineArgString..................................................................................64
8.20 CmdLineArgStringAndDouble................................................................65
8.21 CmdLineArgTideSystem.........................................................................65
