Ondra14

## REPRO.md

      
        
          
            
              
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                Ondra14
                / REPRO.md
            
            
              Created
              April 30, 2026 19:37
            
              
                data-mesh-imagery #162 — codec block artifact at WMTS data/no-data boundary; reproduction recipe
              
          
        
      
        

      
      
    Issue #162 — codec block artifact at data/no-data boundary (reproduction package)

Symptom

Saw-tooth / blocky aliasing at the boundary between rendered imagery and
WMTS-empty regions of a tile (NOT between adjacent tiles — strictly
within a single tile). Visible in output/asiago_real_atlas.png,
sharply zoomed in ~/Desktop/edge.png. Pattern is the 4×4 BasisLZ /
ETC1S block grid intersecting the curved data-extent boundary.