Axis swap
Added in version 5.0.0.
Change the order and sign of 2,3 or 4 axes.
Alias |
axisswap |
Domain |
2D, 3D or 4D |
Input type |
Any |
Output type |
Any |
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.
Usage
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
Parameters
- +order=<list>
Ordered comma-separated list of axis, e.g. +order=2,1,3,4. Adding a minus in front of an axis number results in a change of direction for that axis, e.g. southward instead of northward.
Required.