Subset of Project FeederWatch data demonstrating observer shift

This is a subset of data from the Project FeederWatch dataset, available on the their website. This dataset is restricted to a 15 km radius around Washington, D.C., and includes observations from the most consistent observers. My GitHub repository, titled observer_shift, includes R scripts that processes the raw Project FeederWatch dataset and generates this data subset.本数据集为喂食者观测计划（Project FeederWatch）数据集的子集，该数据集可于其官方网站获取。本数据集限定于华盛顿哥伦比亚特区周边15公里半径范围内，仅纳入观测记录最为稳定的观测者的观测数据。本人名为observer_shift的GitHub代码仓库中，包含用于处理原始喂食者观测计划数据集并生成该数据子集的R语言脚本。