Assigns numeric values of the precision (sd.) of each measurement to the categorical quality ranking of the World Stress Map (A, B, C, D, E, X).
References
Heidbach, O., Barth, A., M<U+00FC>ller, B., Reinecker, J., Stephansson, O., Tingay, M., Zang, A. (2016). WSM quality ranking scheme, database description and analysis guidelines for stress indicator. World Stress Map Technical Report 16-01, GFZ German Research Centre for Geosciences. doi:10.2312/wsm.2016.001