Most of the Landclass data has seen an update (which already happened with my work for the XP11 default scenery ... but HD Mesh Scenery v4 can represent the high res landclass data much better).Which makes it newer than current XP11 default mesh data and of course much, much newer than the data in HD Mesh Scenery v3. OSM data is updated (its “date stamp” is 1st October 2017).This same approach also “imports” antennas / masts from OSM (as antenna obstacles) This usually gives most cities a much better look (New York is a great example, where in OSM almost all buildings already have a height defined). This puts all (well, with some filtering of not reasonable stuff from OSM) buildings > 20m “height” or > 5 “building:levels” as some “high building” object (with a more or less correct height – as defined in OSM) in the scenery (“building:levels” are simply multiplied by 4m to get an approximate height). HD Mesh Scenery v4 also has the new “high buildings” feature included, which I introduced with Laminar in XP11.
Thus road / railroad bendings are more accurate and the same is true for rivers, shorelines (but where the OSM raw data is bad, this can’t help much either)