Coding Challenge #58: 3D Earthquake Data Visualization

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Published on February 20, 2017 5:15:02 PM ● Video Link: https://www.youtube.com/watch?v=dbs4IYGfAXc

Duration: 40:37

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In this coding challenge, I follow up on the Earthquake Data Visualization challenge and create a 3D version in Processing(Java) using spherical coordinates. I also discuss some 3D vector math including the cross product. Code: https://thecodingtrain.com/challenges/58-3d-earthquake-data-visualization

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References:
🔗 Spherical Coordinates System on Wikipedia: https://en.wikipedia.org/wiki/Spherical_coordinate_system
🔗 USGS Earthquake Data: http://earthquake.usgs.gov/data/
🔗 Cross Product Diagram: https://de.wikipedia.org/wiki/Kreuzprodukt#/media/File:Cross_product_parallelogram.svg
🔗 Natural Earth Texture Maps: http://www.shadedrelief.com/natural3/pages/textures.html
🔗 Nasa Earth Maps: http://visibleearth.nasa.gov/view_cat.php?categoryID=1484
🔗 Euler Angle on Wikipedia: https://en.wikipedia.org/wiki/Euler_angles
🔗 Quaternions and spatial rotation on Wikipedia: https://en.wikipedia.org/wiki/Quaternions_and_spatial_rotation

Videos:
🎥 Earthquake Data Visualization: https://youtu.be/ZiYdOwOrGyc

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Related Coding Challenges:
🚂 #9 9-solar-system-3d-textures: https://youtu.be/FGAwi7wpU8c
🚂 #25 Spherical Geometry: https://youtu.be/RkuBWEkBrZA
🚂 #48 White House Social Media Data Visualization: https://youtu.be/UrznYJltZrU
🚂 #109 Visualizing 500,000 Subscribers: https://youtu.be/Ae73YY_GAU8

Timestamps:
0:00 Introduce the coding challenge
1:59 Mention the previous coding challenge 'Earthquake Data Visualization'
2:59 Set up Processing environment with a 3D renderer
3:32 Draw a sphere
4:45 Add lights to shade the sphere
5:06 Rotate sphere around the y axis
5:58 Place a point with a fixed longitude and latitude
7:18 Convert longitude and latitude to an x and y location
8:00 Describe spherical coordinates
8:21 Find Cartesian coordinates
10:28 Draw a box
11:54 Load earthquake data
12:36 Describe `.csv` dataset
14:37 Parse data in a table
15:04 Loop through the rows of the table
15:55 Extract longitude, latitude and magnitude
17:15 Use coordinates to draw boxes
18:34 Add more data points
19:45 Describe how to draw boxes with a different height
22:20 Map the magnitude to the height of the boxes
23:29 Describe how to extrude boxes from the sphere
24:08 Implement vector math
26:47 Introduce cross product
29:11 Diagram cross product
29:37 Calculate rotation axis
30:06 Rotate boxes
31:55 Extrude boxes from the sphere
32:41 Re-introduce magnitude to size the boxes
33:04 Experiment with height values
33:35 Describe output and improvements
34:22 Find Earth texture from NASA reference
35:47 Load texture image
36:18 Add the texture to the sphere
38:12 Describe issue with the alignment of the texture
39:42 Conclude the coding challenge

Editing by Mathieu Blanchette
Animations by Jason Heglund
Music from Epidemic Sound

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#datavisualization #earthquakedata #3d #processing