{
  "schema_version": 2,
  "id": "tarrytown-1892-native",
  "source_kind": "native pixels from an official GeoPDF, decoded and mosaicked without resampling",
  "original_geopdf_url": "https://prd-tnm.s3.amazonaws.com/StagedProducts/Maps/HistoricalTopo/PDF/NY/62500/NY_Tarrytown_144340_1892_62500_geo.pdf",
  "full_geopdf_sha256": "2e8c0e6189cd5ba246f2dcde889edc86625cce98d17fc9be16575e6956c031b0",
  "native_excerpt": {
    "size": [
      6750,
      4600
    ],
    "sha256": "b1ccf4678c615471108b3a82ef2365cbac9d02db23c302e2502fe73ca4f44ce4",
    "full_pdf_pixel_box": [
      2250,
      500,
      9000,
      5100
    ],
    "native_resampling": false,
    "full_sheet": false,
    "new_geographic_registration": false
  },
  "official_scanner_ppi": 600,
  "pdf_density_note": "Official scanner600PPI differs from image matrices; no inferred higher scanner rating.",
  "method": "One global paper estimate, pointwise bounded normalization, per-color empirical optical-density detail. Native scale, no denoise/deconvolution or glyph/contour reconstruction.",
  "parameters": {
    "paper_block_px": 16,
    "paper_quantile": 0.95,
    "paper_grid_sigma": 3.0,
    "paper_target_srgb": [
      0.995,
      0.99,
      0.97
    ],
    "paper_strength": 0.65,
    "paper_max_delta": 4.0,
    "ink_detail_sigma_px": 1.0,
    "ink_gain": {
      "black": 0.07,
      "brown": 0.13,
      "blue": 0.07,
      "red": 0.06,
      "green": 0.05
    },
    "od_detail_cap": 0.8,
    "ink_max_delta": 7.0,
    "bilateral_radius_px": 1,
    "bilateral_spatial_sigma": 0.7,
    "bilateral_range_sigma": 0.035,
    "denoise_blend": 0.18,
    "denoise_edge_protect": 0.06,
    "denoise_max_delta": 1.5,
    "fft_reflect_pad_px": 16,
    "hypothetical_psf_sigma_px": 0.55,
    "wiener_k": 0.08,
    "frequency_gain_cap": 1.35,
    "deconv_blend": 0.25,
    "deconv_max_delta": 2.0
  },
  "processing_manifest_sha256": "3de7fad43735e6f0f4ec9f4421fd2690b6622833ad85c92ee75602c8ef0b5e53",
  "kernel_sha256": "205c0adef7d5733174897304a746f5f65945b25219e79f5ae90c33e7dea91ada",
  "processing_raster_sha256": "170ec39466c8cb3d7751cef1890fc1d113e54095ad292d2b492278305b995aaa",
  "delivery_master_sha256": "1e3d2c3a987c4e06142ee8968e0c7e4097374e6e62d5acc216f13031580b3bc7",
  "lossless_delivery_pixel_equality_verified": true,
  "tiles": "256px lossless WebP, every level sampled directly from native master, no GIS warp",
  "inspection": {
    "review_url": "inspection.md",
    "review_sha256": "47b9948c1930d5f8b52ab3c0bc76f6f5f2266fddd29fa058cf033510ec33ac0f",
    "native_regions_per_excerpt": 18,
    "scope": "Sampled visual review with seam and targeted detail checks; not every-pixel semantic or topological certification.",
    "numerical_limit": "One larger-context review window differed in3 channel samples by1/255; no universal bitwise halo equivalence claimed."
  },
  "vector_status": "All vector replacements held. Ink separation can omit contours, pick up lettering and change connectivity. No vector is served here.",
  "rights": "Historical federal map; USGS HTMC; preserve original collar and original credits. Source georeferencing does not add historical survey accuracy.",
  "driver_sha256": "f632d5a24294c2d125ff563f520228815d9bc83cd69fb07b1d113ec7482d6675",
  "offline_code": "rag/history/native_map_research/{enhance_maps_native.py,full_native_tiled.py}"
}