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| Version 1.9 Build 1488 |
|
| Package | general | |
| Module | images | |
| Tool | image |
| axes | in | Axes to which the Coordinate System pertains | |
| Allowed: | Vector of integers | ||
| Default: | All axes | ||
This function stores the Coordinate System of an image in a Coordsys tool.
By default, the Coordinate System describes all of the axes in the image. If you desire, you can select a subset of the axes, thus reducing the dimensionality of the Coordinate System. This may be useful if you are supplying a Coordinate System to the constructors imagefromarray or imagefromshape.
- im := image('hcn')
- im.summary()
Image name : hcn
Date observation : 2002/12/31/15:15:36
Image mask : None
Image units : JY/BEAM
Direction system : J2000
Frequency system : LSRK
Velocity system : RADIO
Rest Frequency : 1.414e+09 Hz
Name Proj Shape Tile Coord value at pixel Coord incr Units
---------------------------------------------------------------------------
Right Ascension SIN 155 31 17:42:29.303 90.00 -1.000000e+00 arcsec
Declination SIN 178 30 -28.59.18.600 90.00 1.000000e+00 arcsec
Frequency 256 32 1.413350e+09 1.00 1.968717e+04 Hz
Velocity 1.378053e+02 1.00 -4.174021e+00 km/s
-
-
- cs := im.coordsys([1,2])
- imshape := im.shape()[[1,2]]
- im2 := imagefromshape(outfile='test', shape=imshape, csys=cs)
- im2.summary()
Image name : test
Image mask : None
Direction system : J2000
Rest Frequency : Absent
Name Proj Shape Tile Coord value at pixel Coord incr Units
---------------------------------------------------------------------------
Right Ascension SIN 155 155 17:42:29.303 90.00 -1.000000e+00 arcsec
Declination SIN 178 178 -28.59.18.600 90.00 1.000000e+00 arcsec
In this example, we create a Coordinate System pertaining to the first two axes of the image and create a new (empty) 2D image with it with the imagefromshape constructor.