Fix highest peaks being filtered from bathymetry #44
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We were assuming that prominence=elevation for the highest peak in a tree. When the peak's elevation is negative, as in bathymetry, this causes the prominence of the highest peak to be negative, which means the highest peak will always be filtered out.
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We were assuming that prominence=elevation for the highest peak in a tree. When the peak's elevation is negative, as in bathymetry, this causes the prominence of the highest peak to be negative, which means the highest peak will always be filtered out.