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I want to create a map of the world (in my case Winkel Tripel but could be Miller or Equal Earth as well) showing Russia's full extent to the right, like in this example - which might be a very common task:

How the extends should be

Unfortunately I´m running out of ideas to solve this problem.

The project measurements are set up to WGS 84, based on the shape layers you get from Natural Earth Data - but it doesn´t even worked with any other shape layer from other sources.

I tried to reproject the Russian layer to "Asia Lambert Conic", fixed the geometry, dissolved it, exported it, imported it - even into a blank project. Nothing worked. The Russian layer is always showing up distorted.

Reprojection settings I used in QGIS

The distorted result

I came up with the idea that the bounding box, respectively the map extent, might not be correct. I´m not sure if this is the right track. But by testing this: I created a bounding box out the Russian layer extend and reprojected this with the result it became a this line stick to right:

Original bounds and the reprojected result

And if this theory is right I´m not quite sure how to solve it.

Vince
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boess
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    two options that come to my mind right now 1) split your polygone in 2 pieces along the meridian line, 2) use a procejction that is centered with russia in the middle (they exist for WK III etc, too) – Vincé Feb 09 '23 at 13:14

1 Answers1

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There are several options

1. World polygons provided by QGIS

You can set your project CRS to Equal Earth (8857)

In the coordinate box at the bottom of the screen, type world: enter image description here

This is what you will get: enter image description here

2. Split your own geometries along the antimeridian of the chosen CRS

Another alternative as mentioned in a comment, if you really need to handle your own geometries around the antimeridian, is to split the ones that need to.

You can get the main process here without taking care of the PyQgis part.

In short, create a line from north to south pole at the antimeridian, buffer it by a tiny amount, split your geometry layers by this buffered line.

3. Use the Globe Builder plugin

enter image description here

Kasper
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  • Hi Kasper, thanks for your reply. Unfortunately none of your answers worked for me.

    1.) Good to know, but it only provides a quick way to get a world shape layer and the problem isn´t solved by changing the CRS. For perfomance reasons I prefer to work in 3857 and set the final CRS in the layout/export settings

    2.) Splitting the geometry also want provide the deserved result.

    3.) I know the globe builder. It´s nice for what it´s made but you also have a "split" part of russia stick to Alaska.

     – boess Feb 09 '23 at 15:06