What key methodological contribution did Lowell's extensive, albeit flawed, work provide to planetary astronomy?

Answer

It set a standard for systematic, long-term surface mapping.

Lowell's rigorous dedication to charting features, utilizing dedicated facilities for systematic, long-term surface mapping, inadvertently set a standard for observational astronomy that transcended the canal controversy.

What key methodological contribution did Lowell's extensive, albeit flawed, work provide to planetary astronomy?
MarsastronomyobservationplanetCanal