Grid cells
Where the cell-days are
Each circle is one grid cell that was active in the selected month. Larger and darker means more cell-days. Click a circle for the sensors behind that cell. The region total on the calendar is the sum of these cells.
Select a cell
Click a circle. The sample years on this map are 2024 and 2025, so both sensors are present. Months before April 2018, on the calendar, have no VIIRS.