The National Geodetic Survey has released the GEOCON11 set of tools for performing three-dimensional coordinate transformations.
GEOCON11 performs the transformation between NAD 83 (NSRS2007) coordinates and NAD 83(2011) coordinates. GEOCON11 also issues information about the quality of the transformation at each point, and notifications regarding poor quality results.
GEOCON11 recognizes as input the NGS Blue Book *80* and *86* position records. The coordinate transformation and the associated quality values are obtained through biquadratic interpolation within a series of grids. Third party applications may obtain identical results if they use the same grids and algorithms.
GEOCON11 employs high resolution grids (1 arcminute by 1 arcminute) to obtain unprecedented fidelity in modeling coordinate differences. Frequently, one may see that the reported quality is extremely good (e.g. 1 cm or better), but this is not comparable to a geodetic readjustment of survey measurements. The National Geodetic Survey considers actual readjustment of survey measurements, and not coordinate transformations, as best practice.
Information
GEOCON11 was developed using the same software and scientific techniques as GEOCON. However, a separate set of documentation was not developed. Instructions for running GEOCON11 can be inferred from reading the GEOCON Operator’s Guide.
(Instructions on running the program and interpreting results)
(Full details on the functionality of the program, including examples)
(Scientific Report on the creation of GEOCON)
Downloads
Online Computations
Feedback
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