Using the Shapely Package for the Care and Feeding of your 2-D Spatial Data
summary
Shows concrete Shapely code for reading TIGER shapefiles with Fiona, creating buffers and unions, and simplifying 50k-point coastlines down to a few dozen points; demonstrates denoising by area using great‑circle normalization and removes tiny islands (example: drop islands under 250 sq mi in Hawaii). Covers validity checks and fixes (explain_validity, zero-width buffer), warns that buffer is the duct tape of Shapely and that simplify preserves topology is slower, and gives usable notebooks and pitfalls.
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chapters (22)
- 0:00Start
- 0:02Geospatial Data Projection
- 0:13Data Production
- 6:23Line Strings
- 7:28Combining Multiple Shapes
- 7:57Multi Polygon
- 8:45Get Shapes from a File
- 12:55Simplifying Shapes
- 15:23The Douglas Quaker Algorithm
- 17:25Convex Hull
- 19:28Cascade of Union and Unary Union
- 20:41Unary Unions
- 21:04Intersection
- 21:27Difference
- 22:02Broken Shapes
- 22:35Explain Validity
- 23:27Example of Self Interval Intersection
- 24:51Annealing
- 26:09Stack Trace
- 31:38Zip Codes from Outside Vendors
- 33:48Smoothing Algorithm
- 34:56Great Circle Distance
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