Create a globe-like orthographic projection map in QGIS 3

21 Sep 2018 ᛫ 2 min read

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Globe-like orthographic projection map pof the world with the Philippines at center

Orthographic projection maps are great. They have that “global” feel to them since they look like globes which is useful when you want to evoke a sense of “global context” in your map. They also do wonders for emphasizing and highlighting a part of the map especially if you put it in the center and give it a different color than the rest of your map.

Just look at the image above. What’s the first thing you notice? The Philippines, right?

So how do we create globe-like orthogoraphic projection maps in QGIS? Turns out, it’s pretty straightforward. We just have to define a custom Coordinate Reference System. For example, if I want to create a map like the one above, here’s what I’d do:

Download World Borders dataset

Download a World Borders dataset like this from thematicmapping.org.

Load the downloaded dataset in QGIS

Load World Borders dataset in QGIS

Define custom projection

You can define custom Coordinate Reference Systems (CRS) in QGIS by going to Settings -> Custom Projections.

Define custom projection in QGIS

The projection definition that we’ll use is shown below:

+proj=ortho +lat_0=13.5 +lon_0=121.9 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m +no_defs

We are basically defining an orthographic projection centered at 13.5 degrees latitude and 121.9 degrees longitude. That coordinate approximates the center of the Philippines (Hello Balanacan Island!).

If you want to center the map somewhere else, you can just replace 13.5 and 121.9 with the corresponding latitude and longitude values where you want to center your map.

Let’s name our Custom CRS as Globe - PHL and click OK.

Creating a custom coordinate reference system (CRS) in QGIS
Custom CRS parameters in QGIS

Change the current CRS to our custom CRS

Next, we just change the current CRS of our project to that of the custom CRS we just defined.

Change current coordinate reference system (CRS) in QGIS
Select custom coordinate reference system (CRS) in QGIS

After clicking OK, we should see the following result:

Map using custom orthoghraphic projection in QGIS

Change the style of the map

The last step is just to change the style of the map to highlight the Philippines.

You can do this by using a Categorized Symbology on the NAME column like below:

Globe-like custom ortographic projection map in QGIS with the Philippines

And that’s it! You’ve created a globe-like map in QGIS! :)

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BNHR

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