CityCyclingEdinburgh Forum » Topic: Grid reference/Coordinate conversion http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Grid reference/Coordinate conversion en Sat, 16 May 2026 23:53:37 +0000 alibali on "Grid reference/Coordinate conversion" http://citycyclingedinburgh.info/bbpress/topic.php?id=7008#post-73618 Fri, 08 Jun 2012 14:54:32 +0000 alibali 73618@http://citycyclingedinburgh.info/bbpress/ <p>Just so long as the rotations in the Helmert transform can be carried out without injury, we should be OK. </p> fimm on "Grid reference/Coordinate conversion" http://citycyclingedinburgh.info/bbpress/topic.php?id=7008#post-73617 Fri, 08 Jun 2012 14:14:16 +0000 fimm 73617@http://citycyclingedinburgh.info/bbpress/ <p>@DaveC we should stay away from the other thread... </p> DaveC on "Grid reference/Coordinate conversion" http://citycyclingedinburgh.info/bbpress/topic.php?id=7008#post-73582 Fri, 08 Jun 2012 12:08:53 +0000 DaveC 73582@http://citycyclingedinburgh.info/bbpress/ <p>@fimm, Me too. I was wondering what the heck Helmets had to do with it!!! </p> fimm on "Grid reference/Coordinate conversion" http://citycyclingedinburgh.info/bbpress/topic.php?id=7008#post-73580 Fri, 08 Jun 2012 12:01:30 +0000 fimm 73580@http://citycyclingedinburgh.info/bbpress/ <p>I wondered what on earth helmets had to do with this, and then realised it was a <em>Helmert</em> transformation (whoever he was...)<br /> Oops. </p> allytibbitt on "Grid reference/Coordinate conversion" http://citycyclingedinburgh.info/bbpress/topic.php?id=7008#post-73575 Fri, 08 Jun 2012 11:30:08 +0000 allytibbitt 73575@http://citycyclingedinburgh.info/bbpress/ <p>Bookmarked :) Good find. </p> folder on "Grid reference/Coordinate conversion" http://citycyclingedinburgh.info/bbpress/topic.php?id=7008#post-73573 Fri, 08 Jun 2012 11:13:40 +0000 folder 73573@http://citycyclingedinburgh.info/bbpress/ <p>There was a discussion a few weeks ago about grid reference/coordinate conversion, especially doing batch conversions. Since I did some things I thought I'd share them.<br /> There's now a web app at <a href="http://osgbconv.appspot.com" rel="nofollow">http://osgbconv.appspot.com</a> for this. It works both directions and can do many coordinates in one go. I think it is quite accurate because it implements the formulae from the Ordnance Survey (two stages including Helmert transformation).<br /> Any comments/hints for improvement welcome! </p>