Reprojection issues

[Trond Michelsen]

Hi.

I have a set of shapefiles in epsg:4326 projection, that I want to
display in a mercator projection. But, when I reproject the shapefiles
(either by letting mapserver reproject on the fly, or by using shpproj
first), I end up with some very ugly stripes on the map. 

There's an example here: 
http://wms2.oslo.dnmi.no/collins/demo_mercator.html
http://wms2.oslo.dnmi.no/collins/demo_latlon.html

Does anyone what causes this, and how I can avoid it?

-- 
Trond Michelsen