Environmental Protection
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Ethylene Oxide
Ethylene oxide (EtO) is a flammable, colorless gas used to make other chemicals. It is necessary for the production of a range of products, including antifreeze, textiles, plastics, detergents and adhesives. Ethylene oxide also is used to sterilize…
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Tainter Lake/Lake Menomin Total Maximum Daily Load (TMDL)
Red Cedar River. Image courtesy of Jon H. Fuller, 2019.
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Remote Sensing: Future Directions
Future remote sensing research activities at the DNR will concentrate on an increase in Earth observation monitoring capabilities. These research activities include the optical and biogeochemical characterization of lakes across Wisconsin and the…
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Satellite Monitoring (Secchi)
Monitoring Objectives The monitoring objective is to assess lake water quality on approximately 8,000 lakes in Wisconsin by inferring water clarity from satellite imagery on an annual basis. This information is freely available to the public as…
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Remote Sensing: Frequently Asked Questions
What is water clarity? Water clarity or Secchi disk depth is probably the most common limnological parameter measured in lakes today. The Secchi disk was invented by Father Pietro Angelo Secchi, an astronomer and scientific adviser to the Pope…
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Remote Sensing: Resources
The capabilities for the remote sensing of water quality at the DNR are tied to the availability of Landsat 7 ETM+ and Landsat 8 OLI-TIRS data through the NASA/USGS Landsat Program. This data is used for the operational satellite retrieval of water…
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Remote Sensing of Water Quality
Remote sensing presents a cost efficient complementary approach for a more comprehensive assessment of lakes across Wisconsin. The use of remote sensing for the assessment of our aquatic resources provides several advantages compared to conventional…