[PROJ] Make push and pop FIFO?

[Lesparre, Jochem]

Hi Even,

This new implementation uses a single stack instead of 4? So, the following pipeline would alter the ellipsoidal height and swap the original lon,lat? That is quite confusing for users that are used to the old push and pop.

+step +proj=stack +push=1,2 /
+step +proj=cart /
+step +proj=helmert +rx=1 +ry=2 +rz=3 /
+step +proj=cart +inv /
+step +proj=stack +pop=1,2

I am also wondering if the single stack could give new problems. How to access the stack values after the first two? This theoretical (but not unthinkable) case would still be impossible:

* input lon1 lat1 h1
* push lon1 lat1 h1
* helmert transformation to lon2 lat2 h2
* push lon2 lat2 h2
* pop lon1 lat1 h1
* helmert transformation to lon3 lat3 h3
* pop lon2 lat2
* output lon2 lat2 h3

Jochem



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