Data sheet modifications for the NAD 83 (NSRS2007) coordinates
Thursday, November 15th, 2007
Data sheet modifications for the NAD 83 (2007) coordinates
The following modifications to the
data sheets have been
implemented:
Upon further consideration, NGS has decided not to implement the "NAD 83(NSRS2007)" datum tag on datasheets, and will maintain the "NAD 83(2007)" tag as the permanent identifier of points that have an NSRS2007 coordinate.
The format of the records for
the NAD 83 latitude and
longitude and
the NAVD
88 Helmert orthometric height have been permanently changed to keep the
same
spacing as the previous data sheet. The inclusion of 'NSRS' in the
datum tag had moved both fields to the right five places and caused applications
which
take data sheets as input to fail. The new, permanent datum tag will
now read
NAD 83 (2007) and an explanatory note will be added to the data sheet
to
explain that the datum tag '2007' means 'NSRS2007'.
For survey control stations determined 'NO CHECK' by the
national
readjustment, the published NAD83 coordinate line has been designated
'NO
CHECK' (replacing 'ADJUSTED') and the ELLIP HEIGHT line has been
designated 'NO
CHECK' (replacing 'GPS OBS').
The ellipsoid height line has been designated 'ADJUSTED'
rather than
'GPS
OBS' (except for NO CHECK stations; see above).
After further review and analysis NGS decided to leave the
Network
Accuracies
on the data sheet. The Local Accuracies will not be published on the
data
sheets at this time. NGS is working to update the output format of the
Local
Accuracies. In the interim, the Local Accuracies are available in Re-adjustment
Distribution Format (or “RDF”).
The previous update notice for the data sheet may be found here.
Last updated by ngs.webmaster
on Friday, 16-Nov-2007 17:25:39 EST