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.