jiayuasu opened a new pull request, #2684:
URL: https://github.com/apache/sedona/pull/2684

   ## What is this PR about?
   
   Phase 4 of [GH-2678](https://github.com/apache/sedona/issues/2678): Add SVG 
visual illustrations for all **21 measurement functions**.
   
   ### Changes
   
   - **21 new SVG files** in `docs/image/ST_<Name>/ST_<Name>.svg`
   - **63 updated doc files** (21 SQL + 21 Flink + 21 Snowflake) with image 
references
   
   ### Functions covered
   
   | Category | Functions |
   |----------|-----------|
   | Distance | ST_Distance, ST_3DDistance, ST_DistanceSphere, 
ST_DistanceSpheroid, ST_FrechetDistance, ST_HausdorffDistance, ST_MaxDistance |
   | Closest/Longest | ST_ClosestPoint, ST_LongestLine, ST_MinimumClearance, 
ST_MinimumClearanceLine |
   | Area | ST_Area, ST_AreaSpheroid |
   | Length | ST_Length, ST_Length2D, ST_LengthSpheroid |
   | Perimeter | ST_Perimeter, ST_Perimeter2D |
   | Angle | ST_Angle, ST_Azimuth, ST_Degrees |
   
   ### Visual style
   
   - **Distance**: Two geometries (blue A, red B) with dashed green measurement 
line and arrows
   - **Area**: Polygon with green highlighted fill and "- **Area**: Polygon 
with green highlighghlighted in green with "Leng- **Area**: Polygon with green 
highlighted fill and "- **Area**: Polygon with green highlighghlighted in green 
with "Leng- **Area**: istance line to - **Area**: Polygon with green 
highlighted fill and "arthest points
   - **Angle**: Rays with green angle arc annotation
   - **Fréchet/Hausdorff**: Coupling lines between corresponding vertices
   
   ### Image placement
   
   Images are inserted after the complete Introduction section and before the 
Format line, consistent with Phases 1-3. Multi-line introductions (with notes, 
tips, warnings) are handled correctly — image is placed after the full intro 
block.
   
   Closes #2678 (partial — Phase 4 of multi-phase effort)
   


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