From: tsteven4 <13596209+tsteven4@users.noreply.github.com>
Date: Tue, 6 Aug 2024 19:12:58 +0000 (-0600)
Subject: correct WGS84 semi minor axis value. (#1310)
X-Git-Tag: archive/raspbian/1.10.0+ds-2+rpi1~1^2~12^2^2~79
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=e5c26fb2805e2f9abcea7ba52e42fff5fdb574a0;p=gpsbabel.git

correct WGS84 semi minor axis value. (#1310)

It appears the GSR80 value was used instead of the WGS84 value, which
is a very small error.
However, there was a typo in the value in GPS_Math_XYZ_To_WGS84LatLonH
that resulted in an order of magnitude error!
This could lead to GPS_Math_XYZ_To_WGS84LatLonH never converging.
This may be why skytraq created their own function to convert ECEF
to WGS84.
---

diff --git a/jeeps/gpsmath.cc b/jeeps/gpsmath.cc
index 8da383fa5..c97b6ad48 100644
--- a/jeeps/gpsmath.cc
+++ b/jeeps/gpsmath.cc
@@ -457,7 +457,7 @@ void GPS_Math_WGS84LatLonH_To_XYZ(double phi, double lambda, double H,
                                   double* x, double* y, double* z)
 {
   double a = 6378137.000;
-  double b = 6356752.3141;
+  double b = 6356752.314245;
 
   GPS_Math_LatLonH_To_XYZ(phi,lambda,H,x,y,z,a,b);
 
@@ -510,7 +510,7 @@ void GPS_Math_XYZ_To_WGS84LatLonH(double* phi, double* lambda, double* H,
                                   double x, double y, double z)
 {
   double a = 6378137.000;
-  double b = 66356752.3141;
+  double b = 6356752.314245;
 
   GPS_Math_XYZ_To_LatLonH(phi,lambda,H,x,y,z,a,b);