Warren, I think its about time MapInfo and (by the looks of it ESRI) did provide such a projection (BTW thanks for the "variable central meridian" description). And until then, its not difficult for developers to do the zoom handling and data duplication to handle it. If GPS navigation systems worked from -180 to 180, they wouldnt sell one. From a user perspective its not friendly when a navigation track stops because of a GIS deficiency.
thnx. ----- Original Message ----- From: Warren Vick, Europa Technologies Ltd. To: 'Phil Waight' ; [EMAIL PROTECTED] Sent: Tuesday, December 21, 2004 9:19 PM Subject: RE: MI-L Vendee Globe - around the world , map by Esri Hello Phil, It's quite common with desktop-mapping/GIS system to handle a projected earth with no regard for 180E = 180W. It's common to add an "extra" bit of the globe, copied from the "other side of the world", so that data goes beyond 180degrees in order to give continuity. This is a real fudge since overlaid information (such as a boat position) needs to be adjusted. It's not a specific ESRI problem, MapInfo has no world projections with a variable central meridian either. Regards, Warren Vick Europa Technologies Ltd. http://www.europa-tech.com -----Original Message----- From: Phil Waight [mailto:[EMAIL PROTECTED] Sent: 21 December 2004 06:00 To: [EMAIL PROTECTED] Subject: MI-L Vendee Globe - around the world , map by Esri Well, if you have an interest in: 1. Sailing 2. Web mapping OR 3. Knowing where the edge of the world is according to Esri and have a few idle minutes, try this: http://www.vendeeglobe.org/uk/classements and click on "view map" I cannot get the map to show any detail (grid lines, features) East of 180 degrees. So am curious to see what happens in a few days when the lead boats (at 171 east) reach the edge of the world. Do like the wind and boat direction overlay though. Phil.
