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.. _axisswap:
================================================================================
Axis swap
================================================================================
Change the order and sign of 2,3 or 4 axes.
+--------------+---------------------------------------------------------------+
| **Options** |
+--------------+---------------------------------------------------------------+
| `+order` | Ordered comma-separated list of axis, e.g. `+order=2,1,3,4` |
+--------------+---------------------------------------------------------------+
Each of the possible four axes are numbered with 1-4, such that the first input axis
is 1, the second is 2 and so on. The output ordering is controlled by a list of the
input axes re-ordered to the new mapping.
Examples
################################################################################
Reversing the order of the axes::
+proj=axisswap +order=4,3,2,1
Swapping the first two axes (x and y)::
+proj=axisswap +order=2,1,3,4
The direction, or sign, of an axis can be changed by adding a minus in
front of the axis-number::
+proj=axisswap +order=1,-2,3,4
It is only necessary to specify the axes that are affected by the swap
operation::
+proj=axisswap +order=2,1
|
