LSealy...
The FAA is pretty anal about high-definition airport information [tax $$s at work] including surveys for geographic layout.
ORDER 5010.4A Airport Data and Information Management,
FAA AIP Sponsor Guide -1100,
FAA Survey Standards (10/5/12)
The FAA requires accurate survey data in order to develop procedures and to publish charts and directories. The Airports Geographic Information System (AGIS) serves as the FAA’s official process for the collection and maintenance of airport and aeronautical data required to meet the demands of the Next Generation National Airspace System (NEXGEN).
All submitted data must be in the proper format in order to permit the National Geodetic Survey (NGS) to validate accuracy and subsequently approve the collected data. The following FAA Advisory Circulars establish the standards that Sponsors must follow when collecting and submitting data. Sponsors and consultants should no longer reference FAA standard 405 when acquiring aeronautical surveys.
AC 150/5300-16 Establishment of Geodetic Control and Submission to the National Geodetic Survey
AC 150/5300-17 Standards for Using Remote Sensing Technologies in Airport Surveys
AC 150/5300-18 Field Data Collection and Geographic Information System (GIS) Standards
Airports Geographic Information System (Airports GIS),
That precision survey data is readily available with a 'validated need-to-know' for commercial airports in the USA thru the FAA or the local authorities.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]