BUG-000111497 for ArcGIS GIS Server

Bug ID Number	BUG-000111497
Submitted	February 9, 2018
Last Modified	June 5, 2024
Applies to	ArcGIS GIS Server
Version found	10.3.1
Status	Will Not Be Addressed

Additional Information

At 10.4, we replaced the algorithm used for the pe_cart_to_curv and pe_curv_to_cart functions. These functions convert between latitude-longitude-ellipsoidal heights and 3D Cartesian, XYZ, coordinates. The functions are used in equation-based transformations like geocentric translations, coordinate frame, position vector, and Molodensky-Badekas. The new algorithm is called the Fukushima version and is more accurate over a wider range of ellipsoids and is significantly faster. The results differ by under a millimeter, so we decided the positive aspects outweighed the small changes in the results. Between GDA 1994 and WGS 1984 (used by 3857), there is a position vector-based transformation, GDA_1994_To_WGS_1984. Even though the parameter values are all zeroes, the coordinates are still converted from latitude-longitude to XYZ then back to latitude-longitude which is where the difference is introduced.