* Paul Norman <[email protected]> [2012-10-28 20:51 -0700]: > A sensible solution in any NHD translation may be to drop any FCode 46003 > (intermittent) streams without a name. It may also be worth dropping FCode > 46006 (perennial) streams without a name.
I do a lot of tracing streams from aerial imagery with the NHD as an overlay for names and pointers as to the flow locations. (I prefer tracing to importing because I can achieve much better accuracy than the NHD, plus I ensure that the waterways interact properly with roads by adding bridges and tunnels as necessary.) Based on my experience with the NHD, I think an import should probably include FCode 46006 streams; I've seen quite a few decent-sized streams without names that I feel definitely enhance the map by their presence. I probably wouldn't have objections to removing FCode 46003 streams, but be aware that the NHD is the product of a lot of different people entering data over a span of many years (sound familiar?) and the threshold between 46006 and 46003 can vary significantly from area to area, presumably depending on the judgement of the pople entering the data. -- ...computer contrarian of the first order... / http://aperiodic.net/phil/ PGP: 026A27F2 print: D200 5BDB FC4B B24A 9248 9F7A 4322 2D22 026A 27F2 --- -- Miskatonic University Alumni Association Go pods! ---- --- -- _______________________________________________ Talk-us mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-us
