The Minnesota LakeBrowser is an online interactive lake water clarity/quality tool with Landsat-derived classifications of lake clarity of more than 10,500 lakes measured 11 times from 1975-2018. It also includes searchable statewide maps of chlorophyll concentrations and CDOM levels for several recent years. The chlorophyll classifications are based on the European Sentinel-2 satellites.
Typically, the LakeBrowser is used to find water clarity or quality information for particular Minnesota lakes. To do so, you can either zoom in and out of areas to locate the lake of interest, or search lakes by typing the lake name in the Search box. Once you have found the lake, you can display maps by year of lake clarity, chlorophyll a and CDOM, and retrieve lake information from the Minnesota Pollution Control Agency (PCA) and Department of Natural Resources (DNR).
In the past year the LakeBrowser capability/functionality has been transferred to ArcGIS Server, a newer and easier to use platform that improves search and display capabilities. New data for SD, chlorophyll, turbidity and CDOM have recently been added, along with several additional enhancements, including maps and statistical analyses on distributions by ecoregion, watershed and county, plus temporal trends for clarity. Data can be downloaded by users for additional analysis.
Landsat data that have been archived at the EROS Center since Landsat 1 was launched in 1972 enable us to retrospectively classify images and examine historical trends. This type of information helps resource managers target problem areas, enables systematic monitoring of inland lakes, and demonstrates the power of satellite remote sensing. With statewide lake water clarity and quality data for more than a single time period, statistical summaries and analyses that compare conditions over time by ecoregion, watershed, and county can generated.