volunteered

n.

(military) a person who freely enlists for service

同义词：military volunteervoluntary

a person who performs voluntary work

同义词：unpaid worker

a native or resident of Tennessee

同义词：Tennessean

The credibility of volunteered geographic information
Volunteered Geographic Information: The nature and motivation of producers
Assuring the quality of volunteered geographic information
Citizens as Sensors: The World of Volunteered Geography
The importance of volunteered geographic information for the validation of flood inundation models
Volunteered geographic information: future research directions motivated by critical, participatory, and feminist GIS
How Good is Volunteered Geographical Information? A Comparative Study of OpenStreetMap and Ordnance Survey Datasets
Crowdsourcing geographic knowledge: volunteered geographic information VGI in theory and practice
Urinary incontinence during sexual intercourse: a common, but rarely volunteered, symptom
How Many Volunteers Does it Take to Map an Area Well? The Validity of Linus’ Law to Volunteered Geographic Information