On Sat, Feb 4, 2012 at 4:00 AM, David Groom <[email protected]> wrote: > That will depend on the gradient of the land between the highest high water > spring tide, and the lowest high water spring tide, and what location you > are in, since the tidal variation between spring and neap tides varies > enormously depending whereabouts you are. > > I think you are possibly seeking a higher degree of accuracy than is > required. Also then next question would then be to concern ourselves with > whether we took the peak water point of the largest expected wave, or the > average wave.
I think you are right, I'm probably trying to get too much detail. The point I was trying to make was I thought mean high tide was supposed to ignore the effects of waves. Perhaps though for OSM in lure of more accurate details, the highest wave would do as a coastline... On Sat, Feb 4, 2012 at 12:45 PM, mick <[email protected]> wrote: > Is there not an Official Datum for tide heights, I vaguely remember reference > to it in a project I was involved in back in the early 1990's. Then we would still need the contour for that height. _______________________________________________ Talk-au mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-au
