PPSR Core
A Data Standard for Public Participation in Scientific Research (Citizen Science)
PPSR Core is a set of global, transdisciplinary data and metadata standards for use in  Public Participation in Scientific Research (Citizen Science) projects. These standards are united, supported, and underlined by a common framework illustrating how information is structured within the citizen science domain. This allows data to be used across platforms and projects in a consistent manner, furthering the research goals of the scientific community.
Common
Ties all elements of the standard together into one data model
Project
Describes the purpose for the research, who is coordinating it, and other contextual information about the project
Data Set
Describes how observations are collected, how that data may be used, and other information on the data as a whole.
Observation
Describes the structure of individual observations including: location, date, observer, and attributes specific to the research.