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 "serviceDescription": "The layer in this map describes the elevation of the imaginary surfaces that limit building heights around the College Park Airport. The layer is a mesh of polygons, each one containing an imaginary surface height, a ground elevation, and the difference between the two. This difference represents the maximum height a structure can be without penetrating the imaginary surface and therefore obstructing air navigation. All elevation measurements are approximate.",
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 "documentInfo": {
  "Title": "College Park Airport Imaginary Surfaces",
  "Author": "Kerry Gathers",
  "Comments": "The layers in this map describes the elevation of the imaginary surfaces that limit structure heights around the College Park Airport. A generalized layer, which is designed to be displayed at small scales, shows the surfaces' elevation in five-foot ranges. A more precise layer, designed to be displayed at larger scales, shows the surfaces' elevation within one foot. This more prescise layer is a mesh of polygons, each one containing an imaginary surface height, a ground elevation, and the difference between the two. This difference represents the maximum height a structure can be without penetrating the imaginary surface and therefore obstructing air navigation. All elevation measurements are approximate.",
  "Subject": "This map contains two feature classes describing the imaginary surfaces surrounding the College Park Airport.",
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  "AntialiasingMode": "None",
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  "Keywords": "college park airport,imaginary surface,aviation policy area"
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