This post is going to be continuously updated with submissions to the 2021 #30DayMapChallenge. The code for all plots is on GitHub.

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Day 1, points

For day 1, I used an older dataset about heating degree days in Greece with about 160k points.

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Day 2, lines

Ferry lines in Greece.

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Day 3, polygons

Another quick one, this is about the wildlife sanctuaries in Greece, trying a fill pattern with {ggpattern}.

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Day 4, hexagons

A hex map of populated places in Greece that contain the words Saint, Santa or Holy (Άγιος, Αγία, Άγιο).

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Day 5, OpenStreetMap

Speed limits in Thessaloniki, Greece

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Day 6, red

Average max temperature of warmest month in Greece, 1970-2000

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Day 7, green

NDVI for Greece with a touch of 3d. Both today’s and yesterday’s script were modifications of scripts in the great tutorials at https://rspatialdata.github.io

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Day 8, blue

Mapping the depth of the sea around Greece with bathymetric data from NOAA.

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Day 9, monochrome

A 3d render of Greece in Cinema 4D with data from CGIAR-CSI SRTM

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Day 10, raster

Population density in Africa with raster data from the afrimapr R package.

Here is the same map with a scico palette and pseudologarithmic color scale:

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Day 12, population

A cartogram about the 2011 Greek census, data from the Hellenic Statistical Authority

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Day 13, Natural Earth

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Day 14, map with a new tool

GeoJSON as ASCII in a very zoomed out terminal window

Code: geotype greece.geojson -z 13

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Day 16, ubran/rural.

Changes in degree of urbanisation in Greece with data from Eurostat. Only small changes since the data is from 2018 and 2021.

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Day 18, water

Coastal land areas and costal water bodies of Greece. Data from Eurostat and http://geodata.gov.gr

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Day 19, island(s)

Ferry routes between Greek islands. I took the ferry routes from day 2 and clipped the lines that intersected mainland Greece and the neighboring countries.

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Day 20, movement.

Passenger ship movement around Greece (I too wanted to use the ship movement dataset from The World Bank)

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Day 21, elevation

Started in #RStats following the tutorial at https://rspatialdata.github.io/elevation.html but then decided to try 3d. This might be my first Blender render, quite happy with the result.

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Day 22, boundaries

Tectonic plates and significant earthquakes in Greece

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Days 25, interactive, and 26, choropleth

Prices of unleaded 95 RON by prefecture in Greece, using mapdeck for the first time. Short video on Twitter

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Days 27, heatmap

Density of restaurants in Greece with data from OpenStreetMap

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Day 28, the Earth is not flat

Longitude of the centroids of the world’s countries on a circle

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