Grain & Graticule
← Maps & Geospatial

#30DayMapChallenge 2026

One map a day through November, on the daily themes set by the #30DayMapChallenge. Most start close to home in Solana Beach: the coast, the lagoons, the trails, the food and the beer of North County San Diego.

The first map goes up on Sunday 1 November.

  1. 1

    Day 1 · Sun

    Points

  2. 2

    Day 2 · Mon

    Lines

  3. 3

    Day 3 · Tue

    Polygons

  4. 4

    Day 4 · Wed

    Clusters

  5. 5

    Day 5 · Thu

    Senses: Sight

  6. 6

    Day 6 · Fri

    Vintage

  7. 7

    Day 7 · Sat

    10 minute map

  8. 8

    Day 8 · Sun

    Utopia

  9. 9

    Day 9 · Mon

    Urban-rural

  10. 10

    Day 10 · Tue

    Prompting only

  11. 11

    Day 11 · Wed

    Senses: Sound

  12. 12

    Day 12 · Thu

    Power

  13. 13

    Day 13 · Fri

    Interactions

  14. 14

    Day 14 · Sat

    Borgesian map

  15. 15

    Day 15 · Sun

    Inside out

  16. 16

    Day 16 · Mon

    Collaborative map

  17. 17

    Day 17 · Tue

    Light & dark

  18. 18

    Day 18 · Wed

    NULL

  19. 19

    Day 19 · Thu

    Senses: Smell

  20. 20

    Day 20 · Fri

    Hexagons

  21. 21

    Day 21 · Sat

    OpenStreetMap

  22. 22

    Day 22 · Sun

    Projections

  23. 23

    Day 23 · Mon

    Senses: Taste

  24. 24

    Day 24 · Tue

    Network

  25. 25

    Day 25 · Wed

    Is this a map?

  26. 26

    Day 26 · Thu

    Water

  27. 27

    Day 27 · Fri

    New tool

  28. 28

    Day 28 · Sat

    Senses: Feeling

  29. 29

    Day 29 · Sun

    Raster

  30. 30

    Day 30 · Mon

    Pen & paper

About this series

AI use. The maps in this series are my own work. The one exception is Day 10 ("Prompting only"), which is made entirely by prompting Claude, as the theme requires. I also use Claude (an AI assistant) to help build this website and format posts.

Data. Every map credits its data sources on its own page.

Follow along on social media with #30DayMapChallenge.