Armadillo Earth Adjusting the central meridian of the Armadillo projection to ±180°, and the maps will align perfectly. Then you can rotate them. I've been having a lot of fun playing around with Observable lately. Here's my workspace. observablehq.com/@x-b-workspa...

#DuBoisChallenge2026 #Observable Challenge10: PROPORTION OF NEGROES IN THE TOTAL POPULATION OF THE UNITED STATES.

#DuBoisChallenge2026 #Observable Challenge09: NEGRO POPULATION OF THE UNITED STATES COMPARED WITH THE TOTAL POPULATION OF OTHER COUNTRIES.

#DuBoisChallenge2026 #Observable Challenge08: Distridution of Negroes in the United States.

#DuBoisChallenge2026 #Observable Chllenge07: A SERIES OF STATISTICAL CHARTS, ILLUSTRATING THE CONDITION OF THE DESCENDANTS OF FORMER AFRICAN SLAVES NOW RESIDENT IN THE UNITED STATES OF AMERICA

#DuBoisChallenge2026 #Observable Challenge06: Land Owned by Negroes in Georgia, U.S.A.

#DuBoisChallenge2026 #Observable Challenge05: Migration of Negroes.

#DuBoisChallenge2026 #Observable Challenge03/04: Negro Population of Georgia by Counties

#DuBoisChallenge2026 #Observable Challenge01: The Georgia Negro

#DuBoisChallenge2026 #Observable Challenge02: Relative Negro Population of the States of the United States

Day-24 Places and their names #30DayMapChallenge

Day-19 Projections #30DayMapChallenge Let's see how cartographer in the hand-drawn era used <polar orthographic projection> and <inclined equatorial orthographic projection> to create the <orthographic projection centered at a specific latitude>.

#30DayMapChallenge Day-17 A new tool: Observable

#30DayMapChallenge Day-13 10 minute map Just a roadmap.

#30DayMapChallenge Day-11 Minimal map Making Grid Map in Observable inspired by Jo Wood.

#30DayMapChallenge Day-10/15/20 Air/Fire/Water Using WRI’s data to visualize China's power plants, where different colors represent plant types (Wind, Coal, Hydro, etc.) and size indicates installed capacity. And I've marked the top ten.

#30DayMapChallenge Day-09 Analog Hand-drawing is too difficult!

#30DayMapChallenge #prettymaps Day-08 Urban Just having fun with prettymapp.

Day-07 Accessibility #30DayMapChallenge Where can an electric scooter with a maximum speed of 25 km/h and a range of 50 km go?

Day-05 Earth #30DayMapChallenge

Day-06 Dimensions #30DayMapChallenge Using CMAB (Building Height) and OSM data, process height maps in QGIS (adding building and road while subtracting river) and output satellite imagery (which can also generate OSM thematic maps). Finally, create 3D effects in Aerialod.

Day-04 Data challenge: My Data My phone recorded the elevation changes during running. #30DayMapChallenge

Day-03 Polygons 2024 Production (Export) Volume of Crayfish by Chinese Provinces, Municipalities, and Autonomous Regions. #30DayMapChallenge

Day-02 Lines Arrows indicate crayfish exports from Hubei Province, China in 2024. #30DayMapChallenge

Day-01 Points CMYK Dots Relief Representation for Changqing National Nature Reserve (there are pandas!) in the Qin Mountains of Shaanxi province of China. #30DayMapChallenge

Use #QGIS and #GIMP to map #Bioko Island, combined the hillshade and the curvature to get the 3D effect

Building upon the earlier land/water hemisphere maps, this exercise further refines the design by incorporating perspectives of the Eastern and Western Hemispheres, the polar regions, and layered contourline coloring. The result is a relatively comprehensive map. #QGIS #Inkscape #Hemisphere #Map

Ready for the @nacis.bsky.social fall meeting? Here’s an example from my talk — contour smoothing with Python & GDAL. #dataviz #cartography