[Qgis-user] problems reprojecting in equal earth

[C Hamilton]

The way I more or less solved something like this was by pre-clipping the
Natural Earth data at the boundaries of the projection and made two
different vector layers You then will not get the wrap around. If need be
you can shift the longitude of one of layers by 180 degrees and then
attempt to merge the two pieces together. For countries that now have a cut
line down the middle you can then merge the pieces together. It can be time
consuming, but will work. I don't know if there is an easier way.

Calvin

On Wed, Aug 21, 2019 at 1:17 PM Nicolas Cadieux <
nicolas.cadieux at archeotec.ca> wrote:

> Hi,
>
> These are the nasty polygons.  I am hoping you will see the image.
>
> On 2019-08-19 12:26 p.m., Nicolas Cadieux wrote:
>
> Hi,
>
> Trying to help another Qgis user that posted earlier.
>
> We have Natural Earth vectorial Data that we what to reproject in Equal
> Earth.  We want Austria to be in the middle of the map so we created a
> Equal Earth Project using  custom CRS  using +proj=eqearth +datum=WGS84
> +wktext +lon_0=136 with the help of
> https://proj.org/operations/projections/eqearth.html. Using  lon_0=136
> puts Australia in the middle and limits the distortion in that longitude.
>
> Data was reprojected and saved in the new projection (vector/Data
> Management tools/Reproject Layer).  Project is also in the Equal Earth
> projection so no reprojection on the fly is happening behind the scenes.
>
> Question: How so we take care of the nasty polygons that appear when we
> add the "+lon_0=136" parameter?  See the zip.
>
> You can find the data here:
> https://drive.google.com/open?id=1eL6ws8Jc-PugMM2gxV79j0k-TGoWcw6B
>
> Qgis 3.8.1 on Windows 10_64
>
> Thanks
>
> Nicolas
>
>
>
>
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