NODC Standard Format Marine Mammals of Coastal Alaska Data (1975-1976): Marine Mammal Sighting 2 (F026) (NODC Accession 0014151)

NODC maintains data in three NODC Standard Format Marine Mammal Data
Sets: Marine Mammal Sighting and Census (F127); Marine Mammal Specimens
(F025); Marine Mammal Sighting 2 (F026). These data type formats are
designed to support studies of biological populations and ecosystems
that are subject to impact from oil and gas development, marine
pollution and other environmental disturbances. Information on marine
animal populations, activities, migratory routes and breeding locales
are obtained from either surface ship or aircraft surveys.

The Marine Mammal Sighting 2 (F026) data type contains data from field
observations of marine mammals. Obtained from ship or aircraft surveys,
the data are collected to provide information on population density and
distribution, migratory routes, and breeding locales. In addition to
data on the survey track and observed environmental conditions
(including ice conditions, if encountered), the file contains data for
each species sighted. Parameters reported may include total number of
individuals, number of pups, number of groups and number of mammals per
group. F026 contains data for 1976 only. For further information on
these data, contact Karl Schneider (see personnel section). NOTE: In
this file type, the geographic location of each group sighted is not
recorded; in F127, locations of group sightings are recorded as well as
the beginning and end positions of each station or segment of survey
track.

美国国家海洋数据中心（National Oceanographic Data Center，NODC）维护三类采用NODC标准格式的海洋哺乳动物数据集：海洋哺乳动物目击与普查数据集（F127）、海洋哺乳动物标本数据集（F025）以及海洋哺乳动物目击数据集2（F026）。此类数据格式旨在为受油气开发、海洋污染及其他环境扰动影响的生物种群与生态系统研究提供支撑。海洋动物的种群、活动、洄游路径及繁殖栖息地等信息，均通过水面船舶或航空勘测获取。

海洋哺乳动物目击数据集2（F026）包含海洋哺乳动物的野外观测数据。该类数据通过船舶或航空勘测采集，用于获取种群密度、分布范围、洄游路径及繁殖栖息地相关信息。除勘测航线与观测到的环境条件（如遭遇的冰情）相关数据外，该文件还包含各目击物种的相关数据。上报的参数可包含个体总数、幼崽数量、种群群数以及每群的哺乳动物数量。F026数据集仅包含1976年的相关数据。如需获取此类数据的更多信息，请联系卡尔·施奈德（Karl Schneider，参见人员信息章节）。注意：该文件类型未记录每个目击种群的地理位置；而F127数据集不仅记录了目击种群的位置，还记录了每个勘测站位或航段的起止坐标。