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  "limits": [
    "Perspective unknown; orthographic hypothesis is a working choice.",
    "Ellipse is estimated, not camera calibration from measurements.",
    "Clouds and lighting remain baked into illustrations.",
    "Relative image registration is not a physical displacement of continents.",
    "Unknown area is hatched, never filled with invented coast.",
    "No land, ocean, bathymetry, fracture energy, impact velocity or event duration inferred."
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  "mathematicalReference": "J. P. Snyder, USGS Professional Paper 1395, chapter Orthographic, https://pubs.usgs.gov/publication/pp1395"
}