maapäällisiä

Could you clarify the intended meaning and context of "maapäällisiä"? It appears to be a Finnish term, but its exact field (for example archaeology, agriculture, architecture, or linguistics) is unclear. Do you want a general stub that notes multiple possible meanings, or is there a specific usage you have in mind with sources to reference? Once I have the context, I can generate a concise, neutral wiki-style article under 300 words.