An update on the 4D-LETKF data assimilation system for

filter4dFILTER THROUGH SOMETHING definition: 1. to appear or happen gradually or to a limited degree through something: 2. to appear or happen…. Learn more.Method 2 – Use the Excel FILTER Function to Extract Data Based on a Data Validation Drop Down List. If you are working in Excel 2019 and later versions or in Microsoft 365, you can filter data using the FILTER function..