Observations of Astrid, Sanae, and Mertz emperor penguin colonies, 1984-2024; Distances to fast ice edge

.xlsx files containing a catalogue of all dates the Sanae, Astrid, and Mertz colonies were observed in remote sensing imagery, as per Macdonald et al. (in review), 'Response of emperor penguins to 40 years of changing ice conditions at the Astrid, Mertz, and Sanae colonies using satellite remote sensing (1984-2024)'. The dataset catalogues all dates when there was an image of some usefulness and records whether guano was present or not at the site, and which surface type the guano was on, as indicated by an 'x' in the relevant cell. A '~' indicates that it was not clearly visible (primarily due to cloud), but was visible nevertheless. UploadDistanceToFastIce.zip contains shapefiles for all measurements of the estimated (travelable) distance to the fast ice edge from the colonies, as presented in fig. 7. The Landsat and MODIS images used for the calculation are also included. These images were produced by NASA and were sourced from https://earthexplorer.usgs.gov/ and worldview.earthdata.nasa.gov, respectively.本数据集包含.xlsx格式文件，收录了萨纳伊（Sanae）、阿斯特里德（Astrid）及默茨（Mertz）三个帝企鹅种群的遥感影像观测日期完整目录，相关研究依据为Macdonald等人（待刊）的论文《利用卫星遥感（1984-2024年）分析阿斯特里德、默茨和萨纳伊帝企鹅种群40年来对海冰条件变化的响应》。 该数据集编目收录了所有具备有效观测价值的影像日期，并记录对应种群栖息点是否存在企鹅粪（guano），以及企鹅粪所处的地表类型，相关单元格内的"x"将标注上述两类信息。若单元格内为"~"，则表示目标因（主要为云层遮挡）未能清晰识别，但仍可确认存在观测痕迹。 压缩包UploadDistanceToFastIce.zip包含了图7中展示的所有估算得到的（可通行）种群至固定冰缘的距离测量结果的矢量形状文件（shapefile），同时附带了用于该距离计算的Landsat与MODIS影像。上述影像由美国国家航空航天局（NASA）制作，分别获取自https://earthexplorer.usgs.gov/ 与worldview.earthdata.nasa.gov。