File: H:\cctwp\slice_3.5.3.doc , date: 28 sep. 2001.

 

Slice 3: Input to Task 5.3. (with reference to scice 2).

 

5.1. Computation of anomalous quantities corresponding to the GOCE observables.

 

 

S3.1 Development sequence

 

S3.1.1 Inventory

 

The GRAVSOFT program GEOCOL will be used to handle this task.

 

S3.1.2 Software upgrades

 

In order to handle ground data properly, calculation of atmospheric effects and pole tides must be included.

 

S3.1.3 Prototypes

 

GEOCOL.

 

S3.1.4 Implementation

 

It is supposed that fully calibrated data are available.

 

S3.2 Schedule and manpower

 

Minor effort needed.

 

S3.3 Outputs

 

S3.3.1 Development plan (as in 3.1.1-3.1.4)

 

S3.3.2 DRD

 

Changes will be documented in the GEOCOL update log.

S3.3.3 SWPARD

N/a

 

5.2 Computation of gridded values on a sphere at mean satellite altitude.

 

S3.1 Development sequence

 

S3.1.1 Inventory

 

The GRAVSOFT program GEOCOL is used.

 

S3.1.2 Software upgrades

 

The use of spherical approximation must be avoided.

S3.1.3 Prototypes

 

GEOCOL is a working prototype.

 

S3.1.4 Implementation

 

Is implemented in spherical approximation.

 

S3.2 Schedule and manpower

 

Changes are in progress. Expected effort 2 mm.

 

S3.3 Outputs

 

S3.3.1 Development plan (as in 3.1.1-3.1.4)

 

S3.3.2 DRD

 

Changes will be described in the GEOCOL change log.

 

S3.3.3 SWPARD

 

 

5.3 Computations of corrections to the a-priori spherical harmonic coefficients from gridded data.

 

 

S3.1 Development sequence

 

S3.1.1 Inventory

 

EMPCOV and COVFIT used to determine a global analytic representation of the covariance function.

 

The program SPHGRID is available. It has been tested on EGM96 data and using simulated data.

 

S3.1.2 Software upgrades

 

Not needed.

 

S3.1.3 Prototypes

 

COVFIT need to be tuned to global covariance functions and to not using spherical approximation.

 

SPHGRID is fully implemented.

 

S3.1.4 Implementation

 

See above.

 

S3.2 Schedule and manpower

 

Minor. (1 mm).

 

S3.3 Outputs

 

S3.3.1 Development plan (as in 3.1.1-3.1.4)

 

Test of COVFIT: One month, fall of 2002.

 

S3.3.2 DRD

 

Report on global covariance function estimation and modeling will be written.

 

Fast Spherical Collocation Method documented in a paper submitted for publication. Program includes full documentation and test.

 

S3.3.3 SWPARD

 

 

5.3.4. Integration --.

 

HERE INPUT from POLIMI !!!!!