I'm working on an situation where a client wants, in addition to the .shp & .prj files that I can produce with e.g.
rgdal::writeOGR, the .sbn & .sbx files as well.
My understanding is this is an ARCGIS proprietary file type (?), as explicated here, which is designed to facilitate lookups/queries on larger shapefiles (which indeed I am dealing with).
Is this truly a proprietary file type, or is there some way to produce these indices using R tools?