source: branches/asap-3.x/python/coordinate.py@ 1910

Last change on this file since 1910 was 1697, checked in by Malte Marquarding, 15 years ago

Some minor tidy up and documentation

File size: 652 bytes
Line 
1from asap._asap import coordinate as _coordinate
2
3class coordinate(_coordinate):
4 """Representation of the spectral coordinate of the data (frequency axis).
5 """
6 def to_frequency(self, pixel, unit='Hz'):
7 """
8 Convert a channel/pixel value to a frequency.
9 """
10 umap = {'GHz': 1.e9, 'MHz' : 1.e6, 'kHz': 1.e3, 'Hz': 1. }
11 return _coordinate.to_frequency(self, pixel)/umap[unit]
12
13
14 def to_velocity(self, pixel, unit='km/s'):
15 """
16 Convert a channel/pixel value to a velocity.
17 """
18 umap = {'km/s': 1, 'm/s': 1e-3}
19 return _coordinate.to_velocity(self, pixel)/umap[unit]
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