Tensor interpolation for non-stationary geostat fields #641
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…tensor and changed the config_func_str in pst_from to use it instead of value interpolation. this avoids issues with interpolating angles and I believe is more propa.
…rything 2d for easier comprehension
…is messed up, probably generate_from_files
…d examples. normalize weights in _moving_average_field still open question.
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Some utilities to perform log-Euclidean interpolation of anisotropic variance tensors from conceptual points to a regular grid. Also performs spatial convolution to create non-stationary geostatistical fields from variance tensors. Uses pypestutils where possible, with fallback to python implementation of moving average if needed (e.g., pypestutils fieldgen2d_sva does not accept external iid fields).