{
  "schema_version": 2,
  "id": "tarrytown-1937-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_8034850_1937_62500_geo.pdf",
  "full_geopdf_sha256": "6b951563cd03a2613789d9cfb1efca30a258725051724701620fbfa6fdf35c35",
  "native_excerpt": {
    "size": [
      7750,
      5550
    ],
    "sha256": "4aa50d59378f28d2e0eea612cafd2d343595c8d3738a0ee44f0a938f4e33124d",
    "full_pdf_pixel_box": [
      1850,
      650,
      9600,
      6200
    ],
    "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": "8651603a7b4380e7e5373a09c98145ebd0de8e4c7f52df4c2e7f9a7c6e0be416",
  "kernel_sha256": "205c0adef7d5733174897304a746f5f65945b25219e79f5ae90c33e7dea91ada",
  "processing_raster_sha256": "4ef1401cfd6fc51f944d95fe4cd9e4f549eda6fffc32cc98dae1c80216431462",
  "delivery_master_sha256": "49605616cbdd5e5f6afea9874f3b0ca89f824a23eaf711d2241c6213d062d252",
  "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}"
}