Previously subdivided lands may be merged and resubdivided without reverting to acreage pursuant to Government Code Sections 66499.20.1 and 66499.20.2 through compliance with all of the applicable requirements for the subdivision of land. The filing of the final map or parcel map with the Office of the County Recorder shall constitute legal merger and resubdivision of such parcel, and shall constitute abandonment of all streets and easements not shown on the map.