MACROFILLER

MACROFILLER converts a macro into a filler which can be used with the FILL function.

The macro will find the following elements on the stack when it is called:

6: Geo Time Series™ to fill. Both this GTS and the one above are only meant to expose the metadata
5: Geo Time Series™ of the *other* GTS with a value at the current tick
4: list of [ tick latitude longitude elevation value ] for the pre window
3: [ tick latitude longitude elevation value ] of the *other* Geo Time Series™
2: list of [ tick latitude longitude elevation value ] for the post window
TOP: tick which is being filled

It must leave on the stack a list containing the following elements, in this order:

tick, latitude or NaN, longitude or NaN, elevation or NaN, value