Incorrect formula used, changed to comply with Snyder and other sourc…

…es. Fixes #331
OSGeo · Oct 19, 2016 · 2cac138 · 2cac138
1 parent 8525610
commit 2cac138
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/PJ_omerc.c b/src/PJ_omerc.c
@@ -219,7 +219,7 @@ PJ *PROJECTION(omerc) {
     if (no_off)
         Q->u_0 = 0;
     else {
-        Q->u_0 = fabs(Q->ArB * atan2(sqrt(D * D - 1.), cos(alpha_c)));
+        Q->u_0 = fabs(Q->ArB * atan(sqrt(D * D - 1.) / cos(alpha_c)));
         if (P->phi0 < 0.)
             Q->u_0 = - Q->u_0;
     }