Folks, I was wondering how mapserver handles polygons at the international date-time boundary. Any help would be Appreciated.
-----Original Message----- From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On Behalf Of Stephen Woodbridge Sent: Wednesday, August 22, 2007 8:32 PM To: [email protected] Subject: Re: [UMN_MAPSERVER-USERS] Showing Movement Direction Ben, This is the same problem of displaying GPS tracks. They explicitly a set of points, but when taken as a track over time they are a polyline. You can not do anything with mapserver directly. You do have a few options: 1) write a script that adds heading column to each point, based on the previous point and use this angle to orient a marker for the point. 2) load the data into postGIS and convert the points to a polyline and either display it from postGIS or dump it back to a shapefile. 3) use postGIS to compute the heading column 4) other similar preprocess the data options try search for "gps track" in both mapserver archives and postgis archives. -Steve W Ben Madin wrote: > G'day all, > > I have been looking and reading, but I'm not sure I'm looking for the > right thing. > > I have a number of points from satellite based tracking, giving me a > list of longitude, latitude and a timestamp. These are fairly regular, > and although I can display the points on the map window and see where > animals have moved to, I can't tell which way they moved just by > looking. We vets need to know what came first... > > So I thought I could convert adjacent points (temporally) into line > segments, (earliest point first, latter point last), but I can't find > anywhere in Mapserver that seem to explicitly explain how to do this (or > whether it can be done). > > Can anyone either : > > direct me to the right place, or > give me a set of keywords which might get me to the right place, or > advise me to give up for now? > > cheers > > Ben > > > -- > > Ben Madin > REMOTE INFORMATION > > t : +61 8 9192 5455 > f : +61 8 9192 5535 > m : 0448 887 220 > Broome WA 6725 > > [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > > > > > > Out here, it pays to know... > > > > > > > > >
