On 9/30/2017 3:19 AM, Mark Wagner wrote:
Second, many entries have their coordinates specified using the old NAD
27 datum, but somewhere along the line, that fact was lost and the
coordinates were assumed to be in either NAD 83 or WGS 84. This
results in an offset that increases the further you go from central
Indiana; the offset in Alaska is upwards of a hundred meters to the
west.
I found this [1] page that says:.
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9. What datum applies to the geographic coordinates in the GNIS Database?
All coordinates in the database are in NAD 83. They were converted from
NAD 27 in September 2005.
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And this page [2] which appears to be official metadata that doesn't
mention a datum - but it was written in 1994 (see very bottom of page).
[1] https://geonames.usgs.gov/domestic/faqs.htm
[2] https://geonames.usgs.gov/metadata.html
Brian
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