  Since around 2010, the water quality in lake Mj{\o}sa has begun to decline
after an earlier successful effort to improve the water quality
(\textit{Mj{\o}saksjonen}). In this study, we investigate the possibility of
using satellite imagery to monitor the water quality of lake Mj{\o}sa, and also
compare the use of such an approach to current methods for monitoring the lake.
Using satellite images for remote sensing has layers of complexity that were
not apparent to us at first, and this paper summarizes some of our findings by
discussing factors of water quality, state of the art for use of satellite
imagery for water quality and some of our own initial results. While our
results where not too accurate for this preliminary study, it gives an
introduction to the field and some of the methods that may bring better results
for further research. Satellite images can play an important role in monitoring
changing waters. The field is in development and many factors of water quality
may be analysed with increasing levels of accuracy.
