In order to use satellite data to map the trophic state of lakes regionally, it is first necessary to build models that relate satellite observations to the lake characteristics from a few lakes. The more data we obtain for the largest variety of lakes, the better the models we can develop to predict trophic state in unsampled lakes lakes. And the problem isn't just sampling many lakes.
Timing is also of importance.
Sampling on any date won't work. We need samples taken as close to the date of satellite overpass as possible. Based on our experience, the lakes should be sampled within three days of a satellite overpass. This is because water transparency and algal biomass can vary dramatically within weeks. If you are a volunteer and participate in this project, here you will find information about when to sample your lake.