DDK Filter Definition

[akvas]

Following a discussion in #4, the DDK filter definition was changed to follow the implementation as used by ICGEM (http://icgem.gfz-potsdam.de) and the power laws given in https://github.com/strawpants/GRACE-filter/.

These deviate from the original power law progression in Kusche (2007) and Kusche et al. (2009), which are now available in the DDKGeneric class.

Cheers,
Andreas

Kusche, J. Approximate decorrelation and non-isotropic smoothing of time-variable GRACE-type gravity field models. J Geod 81, 733–749 (2007). https://doi.org/10.1007/s00190-007-0143-3

Kusche, J., Schmidt, R., Petrovic, S. et al. Decorrelated GRACE time-variable gravity solutions by GFZ, and their validation using a hydrological model. J Geod 83, 903–913 (2009). https://doi.org/10.1007/s00190-009-0308-3

[strawpants]

Hi Andreas, I guess to be consistent with icgem it's probably best to get the scaling coefficients from https://github.com/strawpants/GRACE-filter and use these in a lookup table in

grates/grates/filter.py

Line 225 in 85f6202

class DDKGeneric(OrderWiseFilter):

.

All the best,,

Roelof