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Support for hybrid sigma-pressure subsets in netCDF and different units for surface pressure fields

Christoph Fischer requested to merge Christoph.Fischer/waves-met-3-d:hybsig-subsetting into master

This merge request fixes several issues when loading hybrid sigma-pressure data, especially from netCDF.

  • Added support for vertical data subsets (e.g., all ak and bk coefficients are present, but not all levels)
  • Added support for unit handling of the underlying surface pressure field. Before, the surface pressure field was expected in several classes and shaders to be in Pa exclusive. Respective shaders now also receive the conversion factor to hPa for the pressure field.
  • Changed the dropdown menu selection to a text field for the surface pressure field when creating a dataset configuration, and this field is now also used in the netCDF reader.

Merge request is based on !273 (merged), where already a more generalized pressure unit handling was introduced.

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