abigailstone/champlain-ice

Google Earth Engine App for exploring lake ice extent on Lake Champlain

Champlain Ice

A Google Earth Engine App to explore lake ice extent on Lake Champlain using Sentinel-1 SAR data.

https://astone.users.earthengine.app/view/champlain-ice

Layers

Ice-On: The earliest winter date with ice coverage for each pixel, computed by finding the largest difference in backscatter values in a time series ranging from November to February.

Ice-Off: The earliest spring date with open water for each pixel, computed using the same difference measure.

Current Conditions: Estimated current ice cover on Lake Champlain, based on the most recent available SAR image. Ice extent is computed via Otsu thresholding.

References

Y. Zhang, G. Zhang, and T. Zhu, “Seasonal cycles of lakes on the Tibetan Plateau detected by Sentinel-1 SAR data,” Science of the Total Environment, vol. 703, 2020, doi:10.1016/j.scitotenv.2019.135563.

J. Murfitt and C. R. Duguay, “Assessing the performance of methods for monitoring ice phenology of theworld’s largest high arctic lake using high-density time series analysis of Sentinel-1 data,” Remote Sensing, vol. 12, no. 3, pp. 1–24, 2020, doi: 10.3390/rs12030382.