Full 500m

The file ‘Full 500m.csv’ includes environmental covariates calculated within a 500 m radius buffer around the 32 whooping crane group locations obtained with a global positioning system, the 36 locations that were recorded as the center the Public Land Survey System section, and the 10,000 Monte Carlo integration points. The column ‘presence.location’ indicates if the covariates are associated with a location of a whooping crane group (yes) or a Monte Carlo integration point (no). Columns ‘aquatic’ and ‘development’ represent the proportion of aquatic habitat and development within a 500 m radius buffer around whooping crane group locations and Monte Carlo integration points. The column ‘accuracy’ indicates if the location was recorded as the center of a Public Land Survey System section (section) or if the location was recorded with a global positioning system (gps). The location of the 10,000 Monte Carlo integration points were recorded without error and therefore the ‘accuracy’ is recorded as exact. Note: the same 10,000 Monte Carlo integration points were used in all analyses.

文件"Full 500m.csv"包含基于三类点位周围500米半径缓冲区计算得到的环境协变量，分别为：32个通过全球定位系统（global positioning system, GPS）获取的美洲鹤（whooping crane）群位置、36个以美国公共土地测量系统（Public Land Survey System, PLSS）地块中心点记录的位置，以及10000个蒙特卡洛积分点（Monte Carlo integration points）。列"presence.location"用于标识协变量所关联的点位类型：若对应美洲鹤群位置则取值为"yes"，若对应蒙特卡洛积分点则取值为"no"。列"aquatic"与"development"分别代表美洲鹤群位置与蒙特卡洛积分点周围500米半径缓冲区内的水生栖息地占比与开发用地占比。列"accuracy"用于标识点位的记录方式：若为美国公共土地测量系统地块中心点则记为"section"，若通过全球定位系统记录则记为"gps"。10000个蒙特卡洛积分点的位置无误差记录，因此其"accuracy"字段取值为"exact"。注：所有分析均使用同一批10000个蒙特卡洛积分点。