Detection of change in surface water areas and in their geographic distribution on St. Lawrence Island [Amstislavski]

The major aim of this effort is to demonstrate the utility of integration of the remotely sensed imagery data, acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors to detect the temporal and spatial changes in the geographic distribution and area of surface water. The current effort focuses on the coastal areas of St. Lawrence Island. As a Pacific Marine Arctic Regional Synthesis (PacMARS) data product it provides an example of how the implemented methodology can be applied to detect and map changes in coastal open water areas for the period of 2000 to present in all coastal area within the PacMARS study area, from Saint Lawrence Island and along the coastal shelf of the Bering, the Chukchi and Beaufort Seas. The current hydrological data set is for the years 2003 and 2012. It is useful in analyzing the change in the coastlines and coastal water bodies (lakes and streams), critical to the human activities related to the subsistence lifestyles on the Island. Note that we considered only the water surfaces showing an occurrency (i.e., number of water detections divided by the number of available observation) above 35% on an annual basis.

本项研究的核心目标是验证整合由中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer，MODIS）获取的遥感影像数据，以探测地表水域地理分布与面积的时空变化的应用价值。本次研究聚焦于圣劳伦斯岛（St. Lawrence Island）的沿岸区域。作为太平洋海洋北极区域综合计划（Pacific Marine Arctic Regional Synthesis, PacMARS）的数据产品，本数据集展示了所采用的方法如何被应用于探测并绘制2000年至今，PacMARS研究区内所有沿岸区域（涵盖圣劳伦斯岛，以及白令海、楚科奇海与波弗特海的大陆架沿岸区域）的沿岸开阔水域变化情况。本次发布的水文数据集涵盖2003年与2012年的观测数据。该数据集可用于分析海岸线与沿岸水体（湖泊与溪流）的变化，而此类变化对于该岛上依赖生存型生活方式的人类活动具有关键意义。请注意，本研究仅统计年度内水体检出率（即水体检出次数与有效观测总次数的比值）高于35%的水域表面。