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Description
Describe the bug
A number of the iotools do not map elevation
to altitude
as is preferred (see this comment).
For example, _parse_pvgis_tmy_csv
and _parse_pvgis_tmy_csv
includes elevation as a dict entry and so does _parse_pvgis_tmy_json
and surely other PVGIS functions behind the scenes, without necessarily being specified in our code. read_surfrad
also returns elevation.
Also, as altitude
is the preferred pvlib terminology, it should also be added to the Variables and Symbols list.