Theory
Equation
For each grid cell, the value at the source grid time interval is scaled by the ratio of the value of the accumulated normals grid cell value over the normalization period, divided by the value of the accumulated source grid cell value over the normalization period.
Pc=VnVs×Ps
Definitions
- Pc corrected precipitation for the source interval
- Vn normals grid cell accumulated volume over the normalization interval
- Vs source grid cell accumulated volume over the normalization interval
- Ps volume of source grid cell over the source interval
Example 1
In Example 1, the source and normal grids consist of a single grid cell. The source grids are 12 hours, beginning at time 0000, and the normal grids are 24 hours, beginning at time 0000. The user has selected a Normalization Interval of 1 day.
Normalization with the interval of 1 day
Example 2
In Example 2, the source and normal grids consist of a single grid cell. The source grids are 12 hours, beginning at time 0000, and the normal grids are 24 hours, beginning at time 0000. The user has selected a Normalization Interval of 2 days.
Normalization with the interval of 2 days
Example 3
In Example 3, the source and normal grids consist of a single grid cell. The source grids are 12 hours, beginning at time 0000, and the normal grids are 24 hours, beginning at time 0000. The user has selected a Normalization Interval of 1 day. The 0-12 hour source cell has No Data.
Normalization with the interval of 1 day and not having data for a source cell
If no data exists for the source grid cell, the normalized grid cell also contains no data. If no data exists for the normal grid cell, the value of the source grid cell is adopted in the normalized grid.
Example 4
In Example 4, the source and normal grids consist of a single grid cell. The source grids are 12 hours, beginning at time 0000, and the normal grids are 24 hours, beginning at time 0000. The user has selected a Normalization Interval of 1 day. The 0-24 hour normal cell has No Data.
Normalization with the interval of 1 day and the normal cell has no data