North Temperate Lakes LTER Wisconsin Estimated Secchi Depths

This data set contains the estimated Secchi depth (water clarity) measurements for 8645 Wisconsin lakes, derived from Landsat-5 and -7 satellite imagery acquired during the 1999-2001 time period. For details of the process used to create these data, see: Chipman, J. W., T. M. Lillesand, J. E. Schmaltz, J. E. Leale, and M. J. Nordheim. 2004. “Mapping Lake Water Clarity with Landsat Images in Wisconsin, USA.” Invited paper, Canadian Journal of Remote Sensing, Special Issue on Remote Sensing and Resource Management in Nearshore and Inland Waters, 30(1):1-7. Polygons for each lake were taken from the WDNR 1:24,000-scale Hydrography GIS data set (version 2). Several existing fields were deleted, and new ones were added.本数据集收录了基于1999-2001年获取的Landsat-5与Landsat-7卫星影像反演得到的美国威斯康星州8645个湖泊的塞氏深度（Secchi depth，水体透明度）估算值。有关本数据集的生成方法细节，请参阅以下文献：Chipman, J. W., T. M. Lillesand, J. E. Schmaltz, J. E. Leale 及 M. J. Nordheim，2004年，《利用美国威斯康星州Landsat影像绘制湖泊水体透明度分布图》，受邀论文，《加拿大遥感学报》，近岸与内陆水域遥感及资源管理专刊，30(1):1-7。本数据集所用的各湖泊多边形矢量数据取自威斯康星州自然资源部（WDNR）1:24000比例尺水文地理GIS数据集（版本2），并对该原始数据集进行了若干原有字段的删除与新字段的添加操作。