{
  "id": "t07_wells",
  "order": 7,
  "role": "illustration",
  "tag": "illustration",
  "eyebrow": "Appendix \u00b7 Constructed rendering",
  "title": "Illustration: surface points and rendering choices",
  "question": "What can an intentionally constructed surface scene look like after depth smoothing and chosen display settings?",
  "finding": "In this constructed scene, dominant point scatterers produce dark columns (0.20 times desert power), while mixed face edges produce bright bands (4.84 times desert power). The displayed volume ends at 137.5 model-metres, or 630.4 m after a chosen wavelength rescaling.",
  "limitations": "Eight bright points are placed by hand. The 2.2 m wavelength, smoothing and display thresholds are chosen for illustration. This example does not apply T6's acceptance gate. Neither the point count nor the roughly 630 m display floor is an independent prediction. Visual resemblance does not establish the origin of the Khafre features, validate the surface targets' realism, or reproduce the original processing. This illustration neither reproduces nor measures spiral ramps.",
  "method": "T1's pyramid plus eight point scatterers of amplitude 8 at the base corners and mid-edges; paper-variant volume on a 1.25 m grid (36,000 pixels); log-magnitude smoothed with a Gaussian of 1 sample in position and 1.5 in depth; jet colormap and bicubic interpolation to match the published rendering; marching-cubes isosurfaces at the 2nd and 98th percentiles of the volume smoothed along depth.",
  "figures": [
    {
      "file": "results/t07_wells/figs/t07_plan.png",
      "caption": "<b>The constructed scene and its power map.</b> Eight added point scatterers are circled in the input. Dominant points produce dark patches; mixed face edges produce bright bands. The dashed line marks a transect. Locations and display settings were chosen for this illustration."
    },
    {
      "file": "results/t07_wells/figs/t07_slices.png",
      "caption": "<b>Sections through the synthetic volume.</b> Bright bands and isolated point scatterers produce different column-like patterns. The left axes use a chosen wavelength of 2.2 m; the right axes retain 0.48 m. All panels stop at the computed depth limit. This rescaling does not establish the calibration used for the published slides."
    },
    {
      "file": "results/t07_wells/figs/t07_compare.png",
      "caption": "<b>Published and synthetic images.</b> Left: a Khafre Research Project slide, reproduced at reduced size for critique; copyright its authors. Right: a synthetic slice with no buried objects, using a similar display style. Resemblance is an illustration, not a reproduction of the original data or proof of its origin."
    },
    {
      "file": "results/t07_wells/published/khafre_composite_slide.jpg",
      "caption": "<b>Published composite slide.</b> Plan view of the pyramid footprint with circled 'wells', vertical sections with columns, and hand annotations placing Khafre's known chambers (Belzoni's chamber, the lower chamber) on blobs. Reproduced at reduced size for critique; copyright the Khafre Research Project."
    },
    {
      "file": "results/t07_wells/published/khafre_cad_ramps.jpg",
      "caption": "<b>Published interpretation.</b> A CAD illustration of cylinders and spiral ramps beneath a wireframe pyramid. The illustration is distinct from a measured radar image. Reproduced at reduced size for critique; copyright the Khafre Research Project."
    },
    {
      "file": "results/t07_wells/published/khafre_cad_coils.jpg",
      "caption": "<b>Another published CAD view.</b> Cylinders, coils, and basal blocks depict the project's interpretation. Their shapes and depths are not independently validated here. Reproduced at reduced size for critique; copyright the Khafre Research Project."
    },
    {
      "file": "results/t07_wells/figs/t07_isosurface.png",
      "caption": "<b>A rendering of the synthetic volume.</b> Low-power regions (blue) and high-power regions (orange) appear as columns or walls after smoothing along depth. Their common lower boundary is the end of this computed volume. Isosurface shape depends on the chosen threshold and smoothing."
    },
    {
      "file": "results/t07_wells/figs/t07_rungs.png",
      "caption": "<b>Spectra in selected regions of the constructed scene.</b> The comb fits differ across regions and do not cleanly follow one course spacing. This comparison does not measure or explain a published spiral structure."
    }
  ],
  "metrics": {
    "n_bright": 8,
    "bright_amplitude": 8.0,
    "grid_pixels": 36288,
    "depth_axis_max_m_slides": 630.3943462871625,
    "depth_axis_max_m_paper": 137.5405846444718,
    "power_ratio_point_wells_vs_desert": 0.2010549157857895,
    "power_ratio_bright_bands_vs_desert": 4.841829776763916,
    "rungs": [
      {
        "region": "bright bands (walls)",
        "pixels": 1068,
        "comb_spacing_m": 8.170426065162907,
        "comb_score": 1.0746838162272958
      },
      {
        "region": "wells under bright points (dark)",
        "pixels": 210,
        "comb_spacing_m": 6.887218045112782,
        "comb_score": 1.1497783231887102
      },
      {
        "region": "open desert",
        "pixels": 4104,
        "comb_spacing_m": 7.7293233082706765,
        "comb_score": 1.0587759041991218
      }
    ],
    "predicted_course_spacing_depth_m": 7.069903158782965,
    "isosurface_percentiles": [
      2.0,
      98.0
    ],
    "runtime_s": 2.3906471729278564
  },
  "date": "2026-09-19",
  "provenance": {
    "python": "3.11.3",
    "numpy": "2.4.6",
    "source_sha256": "f13bd0dafe07d5c6f928689a2e904cd46a5ea50a66ac67344676fdf6f5d3d27a"
  }
}