fix: Fix 0 elevation bug in relalt filter #75
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There was an issue where when filtering the elevation based on distance, the replacement value for excluded cells in the grid would be set to
Falsewhich Python helpfully treats as0when determining the minimum altitude in the radius. As a consequence all sites would be compared to a valley floor of0m. Now the replacement is set properly toNaN, which should fix the valley floor calculation.Thanks @heikoklein for finding the problem.