...
Convert the geographical coordinate system (horizontal datum and projection) to specified geoDatum during import. Not all parsers support this parameter so please check the documentation for a particular parser to see if it is supported.
traceValue
Value to be replaced by 0 during import, before datum conversion. For example, some NWP products show minute negative values. These can be filtered upon import by setting the traceValue. Example: <traceValue>-0.025</traceValue>
missingValue
Optional specification of missing value identifier in external data format.
...