Assertion: glacier's contribution | /r/HasProperty | derived
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Source sentences:
text: Eleven contributions are derived from monthly spherical-harmonic solutions of the global gravity field using different approaches55,56,61,62,63,64,65,66, which can be loosely classified as (i) region-integration approaches55,65,66, (ii) post-spherical-harmonic mascon approaches56,61,62,63, (iii) forward-modelling approaches62,64, which essentially involve modelling of mass change with iterative comparison to the GRACE-derived signal, and (iv) approaches that use Slepian functions67.