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Version 1.9 Build 1488 |
|
Package | general | |
Module | images | |
Tool | coordsys |
value | in | Relative coordinate | |
Allowed: | Numeric vector, vector string, vector quantum, record | ||
isworld | in | Is coordinate world or pixel ? | |
Allowed: | T, F, unset | ||
Default: | unset |
This function converts a relative coordinate to an absolute coordinate. The coordinate may be a pixel coordinate or a world coordinate.
If the coordinate is a pixel coordinate, it is supplied as a numeric vector. If the coordinate is a world coordinate, you may give it in all of the formats described in the formatting discussion.
If the coordinate value is supplied by a Coordsys tool function (e.g. toworld) then the coordinate 'knows' whether it is world or pixel (and absolute or relative). However, you might supply the value from some other source as a numeric vector (which could be world or pixel) in which case you must specify whether it is a world or pixel coordinate via the isworld argument.
- cs := coordsys(direction=T, spectral=T) - - aw := cs.toworld([100,100,24], 's') - rw := cs.torel(aw) - aw2 := cs.toabs(rw) - - aw 23:53:23.781 +01.39.00.821 1.415023e+09 Hz - rw 5.943285e+03 arcsec 5.940821e+03 arcsec 2.300000e+04 Hz - aw2 23:53:23.781 +01.39.00.821 1.415023e+09 Hz
This example uses world coordinates.
- cs := coordsys(direction=T, spectral=T) - - ap := cs.topixel() # Reference value - rp := cs.torel(ap) - ap2 := cs.toabs(rp) - - ap [1 1 1] - rp [0 0 0] - ap2 [1 1 1]This example uses pixel coordinates.