Data from: Multi-image flock size estimation with CountEm: A case study with half a million Common Eiders and Greater Snow Geese.

The present data set is related to the manuscript "Multi-image flock size estimation with CountEm: A case study with half a million Common Eiders and Greater Snow Geese" submitted to the Ecosphere journal. The files COEI_data.csv and GSGO_data.csv contain data and results of the 179 COEI and 99 GSGO ECA Flocks images respectively. The files have one row per image. Both files have 9 columns corresponding to the following variables: “Filenumber” is used to identify the number of the corresponding image, namely “001” to “099” for GSGO, and “001” to “179” for COEI. “N”: Total number of annotated birds in the image. “Nest”: Bird number estimation (bN 439 ) obtained with a single real mode CountEm run. “CE_sim”: Empirical coefficient of error (relative standard error, CEe(bN 440 )) obtained from 2000 simulated measurements in simulation mode. “f”: Sampling fraction used in the real mode CountEm run. “n0”: Initial number of quadrats used in the real mode CountEm run. “Q”: Total number of birds (i.e. sample size) counted in the real mode CountEm estimation. “n”: Number of non-empty quadrats counted in the real mode CountEm estimation. “UserTime”: Counting time (in minutes) in the real mode CountEm estimation. “ManualTime”: Counting time (in minutes) of the manual annotation process with ImageJ.本数据集关联于一篇提交至《生态圈》（Ecosphere）期刊的稿件：《基于CountEm的多图像种群规模估算：以50万只普通绒鸭与大雪雁为例》。文件`COEI_data.csv`与`GSGO_data.csv`分别涵盖179幅COEI图像与99幅GSGO的ECA群图像的相关数据及估算结果，每张图像对应数据文件中的一行。两个文件均包含9列数据，对应变量说明如下："Filenumber"：用于标识对应图像的编号，大雪雁数据集的编号范围为"001"至"099"，普通绒鸭数据集的编号范围为"001"至"179"；"N"：图像中已标注鸟类的总数量；"Nest"：通过单次CountEm实模式运行得到的鸟类数量估算值（bN 439）；"CE_sim"：通过模拟模式下2000次模拟测量得到的经验误差系数（相对标准误差，CEe(bN 440)）；"f"：CountEm实模式运行中采用的抽样比例；"n0"：CountEm实模式运行中初始设置的样方数量；"Q"：CountEm实模式估算过程中统计的鸟类总数量（即样本量）；"n"：CountEm实模式估算过程中统计的非空样方数量；"UserTime"：CountEm实模式估算所用的计数时长（单位：分钟）；"ManualTime"：使用ImageJ完成手动标注流程所需的计数时长（单位：分钟）。