[Qgis-user] reprojection troubles

[Jukka Rahkonen]

Andreas Neumann <a.neumann at ...> writes:

> 
> Hi,
> 
> I was trying to convert natural earth 110m layers from EPSG 4326 to EPSG
> 3857.
> 
> Two of the layers (ocean and land) fail to convert with the following error:
> 
> Error 6
> Feature write errors:
> Failed to transform a point while drawing a feature with ID '8'. Writing
> stopped. (Exception: forward transform of
> (3.141593, -1.570796)
> PROJ.4: +proj=longlat +datum=WGS84 +no_defs +to +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= <at> null +wktext  +no_defs
> Error: tolerance condition error)
> 
> Is there anything I can do about this tolerance condition error?

A guess: perhaps those Natural Earth layers contain vertices close to the
poles? EPSG:3857 is valid only between -85 - 85 degrees. If that is the case
it might to help to cut your vectors a bit at high and low latitudes.

-Jukka Rahkonen-