Marine mammal relative abundance, seasonal use locations, and use type data used in the creation of Audubon Alaska's Ecological Atlas of the Chukchi, Bering, and Beaufort Seas

This dataset contains a variety of spatial data types describing seasonal use locations, use types, and migration patters for marine mammals in the Bering, Chukchi, and Beaufort Seas. These datasets were used by staff at Audubon Alaska and Oceana to create the twenty maps displayed in 'Chapter 6: Mammals', in the 'Ecological Atlas of the Bering, Chukchi, and Beaufort Seas'. These were used to create maps describing seasonal use areas; approximate range extents; haul out, rookery, forage and locations; and general migration patterns for polar bears, and for a variety of pinnipeds and cetaceans that occupy the Bering, Chukchi, and Beaufort Seas. This dataset contains four zipped archives of spatial data and metadata and two summary files. The zip files are: 1. ArcticMarine2017_Public_Ch6Mammals.gdb.zip, compiled by Audubon Alaska staff and used to generate the maps in Chapter 6 of the Ecological Atlas. 2. ch6_vector-4326, containing csv formatted vector data files along with metadata extracted from the geodatabase. 3. ch6_raster, containing geotiff formatted raster data and metadata used in the maps in the Atlas but not included in the geodatabase. 4. ch6_shapefiles, containing updated versions of some of the vector or raster layers in the geodatabase, as delivered separately by Audubon, and without individual metadata records. The summary files are: 1. audubon_EABCBS_ch6_mammals_manifest.txt, listing all file path, size, and md5sum hash value for each file in each of the zip files, 2. audubon_EABCBS_ch6_mammals_README.txt, providing basic, human-readable metadata about the dataset, 3. audubon_EABCBS_ch6_mammals_data_sources.pdf, listing the data sources used for each map in chapter 6 of the atlas, and 4. audubon_EABCBS_data_sources_appendix.csv, listing the sources used for each spatial synthesis data product created by Audubon Alaska, used to generate the maps in chapter 6, and listed in the data sources pdf. These files contain only the data used in the Atlas and deemed appropriate for public release. Certain data deemed sensitive were not included in these publicly available data archives.

本数据集包含多种空间数据（spatial data）类型，用于描述白令海（Bering Sea）、楚科奇海（Chukchi Sea）与波弗特海（Beaufort Sea）海域内海洋哺乳动物的季节性栖息位置、活动类型与迁徙模式。本数据集由奥杜邦阿拉斯加（Audubon Alaska）与海洋保护组织Oceana的工作人员使用，用于制作《白令海、楚科奇海与波弗特海生态图集》中“第6章：哺乳动物”板块展示的20幅地图。这些数据被用于绘制涵盖以下内容的地图：该海域内北极熊、多种鳍足类动物与鲸类的季节性栖息区域、大致分布范围、上岸休憩地、繁殖栖息地与觅食地的位置，以及整体迁徙模式。
本数据集包含4个空间数据与元数据（metadata）压缩归档包，以及2个汇总文件。各压缩归档包详情如下：
1. ArcticMarine2017_Public_Ch6Mammals.gdb.zip：由奥杜邦阿拉斯加工作人员编制，用于生成该生态图集第6章的地图；
2. ch6_vector-4326：包含CSV格式的矢量数据文件，以及从地理数据库（geodatabase）中提取的元数据；
3. ch6_raster：包含图集地图制作中使用但未纳入地理数据库的GeoTIFF格式栅格数据与元数据；
4. ch6_shapefiles：包含奥杜邦阿拉斯加分会单独提供的、地理数据库中部分矢量或栅格图层的更新版本，且未附带单独的元数据记录。
汇总文件详情如下：
1. audubon_EABCBS_ch6_mammals_manifest.txt：列出所有压缩归档包内各文件的完整路径、文件大小与md5sum哈希值；
2. audubon_EABCBS_ch6_mammals_README.txt：提供该数据集的可读版基础元数据；
3. audubon_EABCBS_ch6_mammals_data_sources.pdf：列出该图集第6章每幅地图所使用的数据源；
4. audubon_EABCBS_data_sources_appendix.csv：列出奥杜邦阿拉斯加分会为制作第6章地图所创建的各空间合成数据产品对应的数据源，该内容已在数据源PDF文件中列明。
上述文件仅包含该生态图集中使用且适合公开发布的数据，部分涉及敏感信息的数据未纳入本次公开的压缩归档包中。