The Hydro Temporal Variability (HTV) dataset represents a summary of variability in surface water extent during ice-free months (April-October) from 2014-2017 in Alberta. The layer values demonstrate the percent of time a given 10 m pixel was identified as water, and is intended to support monitoring of lake level fluctuations, and identify seasonally flood areas, recurring lakes and permanent lakes in Alberta. This layer is calculated with Sentinel-1 C-band Synthetic Aperture Radar from the Copernicus Program (Copernicus Sentinel data 2014, 2015, 2016), which became available in 2014. Sentinel-1 orbital path covers the entirety of Alberta every six days and therefore each 10 m pixel in Alberta has rich time series data stack. The algorithm was developed and implemented in Google Earth Engine (Gorelick et al., 2017).  Updates to this dataset will occur annually as the previous years SAR imagery is incorporated into the data. 

Full details for this dataset can be seen in the publication DeLancey et al. (2018), or by referring to the technical document available for download below.