Journey North - Tulip observations by volunteer community scientists across North America (1996-2020)

This data package contains tulip phenology data consisting of 21,148 total observational reports from 1996 - 2020 across North America. These data were collected by 6,645 community scientists for Journey North, a crowdsourced participatory science program of the University of Wisconsin-Madison Arboretum. The Journey North Tulip Test Garden Project is an ongoing study of tulip phenology conducted at broad spatial and temporal scales. Since 1996, community scientists have tracked planting, emergence, and blooming of tulips (Tulipa L.) in the United States. Most observations should be of the Red Emperor Tulip, but not all observations can be validated as this species. Researchers are encouraged to read observer comments to confirm tulip species. Observers also provide estimates of the number of tulips sighted. However, observers do not follow standardized methods for counting species observed. Observers do not observe at set times of the day, do not repeat observations regularly, and are not required to provide the length of time during which a specified number of species observed were counted. Therefore, it is recommended that this dataset be analyzed to indicate broad phenological information. Researchers are encouraged to read the rich information provided by volunteers in their comments. These comments provide qualitative information about observational reports. Researchers are also encouraged to refer to submitted photographs that also provide context for observational reports. The Journey North Tulip Test Garden Project dataset is hosted by the University of Wisconsin-Madison Shared Web Hosting Service.

本数据包包含郁金香物候学数据，涵盖1996年至2020年间北美地区共计21148份观测报告。这些数据由6645名社区科学家为参与“Journey North”项目所采集，该项目是威斯康星大学麦迪逊分校植物园发起的众包参与式科学计划。
“Journey North郁金香试验园项目”是一项在大空间与时间尺度上开展的郁金香物候长期研究。自1996年起，社区科学家便在美国境内追踪郁金香属（*Tulipa* L.）植物的种植、出苗与开花情况。绝大多数观测对象为红皇帝郁金香（Red Emperor Tulip），但并非所有观测都能被证实属于该品种。建议研究人员查阅观测者备注，以确认所记录的郁金香品种。
观测者还会提供目击郁金香的数量估算值，但并未遵循标准化方法对观测到的郁金香品种进行计数。观测者未固定观测时段，也未定期重复开展观测，且无需说明计数指定数量观测物种的持续时长。因此，建议将本数据集用于分析宏观层面的物候信息。
建议研究人员充分参考志愿者在备注中提供的丰富信息，这些备注可提供观测报告的定性补充信息。同时建议研究人员查阅随观测报告提交的相关照片，这些照片可进一步补充观测背景信息。
“Journey North郁金香试验园项目”数据集由威斯康星大学麦迪逊分校共享网络托管服务平台提供托管。