...
Specifies how to apply land-sea mask processing.
lsm=<value> |
|---|
MIR, the interpolation package used in MARS and Dissemination, does not apply By default land-sea mask processing is not applied to any parameter by default. However, even thought though not recommended, users can request land-sea mask processing can be requested for generation of points in the target grid. The idea is to use the land-sea mask of both source and target grids to modify the effect of the input points on the target value being generated for those input points having a different land-sea nature to that of the target grid point. For example, if a sea point is being generated in the target grid from four neighbouring points in the source grid, three of which are sea points (i.e., with land-sea mask values less than 0.5) and one of which is a land point (with land-sea mask value greater than 0.5), then the weight of the input grid land point in the interpolation will be reduced so that it contributes less to the final target value.
The land-sea mask applied in MIR is based on a 1 km resolution field. The weight adjustment factor applied is 0.2. MIR does not apply If the nearest neighbour interpolation method is used, land-sea mask processing when using the nearest neighbour methodis not applied.
Examples:
|
...