[Mapserver-users] Polar stereographic projection misbehaviour

[Sebastian Albrecht]

Hello,

I have a shapefile containing coastlines of the Antarctica projected
in: "proj=stere,ellps=WGS84,lat_ts=-75,south,lat_0=-90"

Further I have a shapefile containing only latlong coordinates as
shiptracks and a graticule layer using the GRID feature.

The coastlines are displayed correctly but there are often missing
parts of the other layers. The latlong tracks are just cut off at some
latitude coordinate and the graticule is only displayed down to -60 or
-70 degrees latitude.

I added some logging code to the map_project.c file and found out
those missing values are not even send to the projection library. It
seems to me Mapserver somehow does not know what to do with the given
extent and thinks several values are not located in the area to be
displayed?!

Is there a solution for this problem? I use Mapserver 4.0 and PROJ
4.4.7.

Many thanks and best regards,
Sebastian