Does anyone know what is the logic when I transfer the vector data to raster data through Numeric rasterizier? For example the original attribute value for the polygon inside one cell is 100 (accounts for 10%) and other polygon is 10(accounts for 90%). What is the value of new rasterizied cell?
The general rule of thumb when dealing with FME Rasters is last feature in wins.
In the case of the NumericRasterizer, the value of the last vector to enter the transformer will have priority over all other features.
You can use a Sorter to control the feature order, or if you want to have an average of the values you can use an AreaOnAreaOverlayer (w/ list) to identify the overlap and then an ExpressionEvaluator to calculate the value you want.