[mapserver-users] disappearing point features in North America

[forums]

Chris:

I had a similar issue, it was suggested to me to add "+over" to my epsg
definitions file.

Mine now looks like:
<4326> +proj=longlat +ellps=WGS84 +datum=WGS84 +over +no_defs  <>
<900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
+y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +over +no_defs <>

That seemed to make a difference, but I also upgraded PROJ4 at the same
time.

Jerl

On Wed, Feb 1, 2012 at 5:38 AM, Chris Green <chris.green at ibstv.co.uk> wrote:

> I have a problem that may be down to OpenLayers or to Mapserver, or (just
> as likely) to me. Basically I am using OL to request WMS maps from
> Mapserver, and the map consists of point features with a global spread,
> typically around 100 points in each map. The points are defined in a table
> which has lat/lon in decimal degrees, and these are converted to 900913 by
> Mapserver where my mapfile has an overall projection of epsg: 900913 but
> the points layer has projection epsg: 4326.****
>
> ** **
>
> The map is defined in OL with extents: -20037508.34, -20037508.34,
> 20037508.34, 20037508.34 and the mapfile has the same extents applied.****
>
> ****
>
> This all works fine when a map is first displayed, all of the points are
> present on the map. However when I scroll the map left or right there is a
> ‘dead spot’ where  all the points in North America disappear and then
> re-appear, either side of the dead spot. Looking with Firebug at the
> bounding box that OL uses to request the map from Mapserver I can see that
> the points disappear when the bounding box is between left bounds of about
> -23700000 and -33700000. Only the points in North America are affected,
> never those in Europe or Asia. ****
>
> ** **
>
> I have been wrestling with this for quite a while, experimenting with
> extents etc, all without any effect.  Does anyone recognise where my
> problem may lie, or else have any suggestions how to diagnose what is going
> on?****
>
> ** **
>
> ** **
>
> Chris  ****
>
> ** **
>
> ** **
>
> ** **
>
> ** **
>
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>
>


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