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It is possible to download a subextent of a grid by defining properties in the Import file. The methodology is described in detail in this presentation.
Note that defining a subgrid for the KNMI radar product is a bit more complicated due to the projection of the frid. The methodology to get the correct configuration values in the import file and the grids.xml can be found in this document: Nieuwe instructies voor import - KNMI Radar Subgrid.pdf.
View period
Where appropriate a viewPeriod can be configured. The view period can be no longer than one year, since the WIWP api doesn't support periods longer than that.
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