Inverse of Erasov glacier scaling function. Only works for positive glacier volume.
See also
glacierVolume_Erasov, glacierArea_RGIF
Other Glacier functions:
ErazovsGlacierFunction(),
glacierAreaVolume_Aizen(),
glacierArea_RGIF(),
glacierMelt_TI(),
glacierVolume_Erasov(),
glacierVolume_RGIF()