Make constant fields available #21
Description
We need access to the constant fields such as land_mask or terrain height. See, e.g., here https://github.com/MeteoSwiss/HiRAD-Gen/pull/19/files#r2257664640
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We need access to the constant fields such as land_mask or terrain height. See, e.g., here https://github.com/MeteoSwiss/HiRAD-Gen/pull/19/files#r2257664640