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Last change
on this file since 1789 was
1789,
checked in by Kana Sugimoto, 14 years ago
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Merged the all developments from alma branch. copied external-alma.
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File size:
652 bytes
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| 1 | from asap._asap import coordinate as _coordinate |
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| 2 | |
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| 3 | class coordinate(_coordinate): |
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| 4 | """Representation of the spectral coordinate of the data (frequency axis). |
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| 5 | """ |
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| 6 | def to_frequency(self, pixel, unit='Hz'): |
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| 7 | """ |
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| 8 | Convert a channel/pixel value to a frequency. |
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| 9 | """ |
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| 10 | umap = {'GHz': 1.e9, 'MHz' : 1.e6, 'kHz': 1.e3, 'Hz': 1. } |
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| 11 | return _coordinate.to_frequency(self, pixel)/umap[unit] |
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| 12 | |
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| 13 | |
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| 14 | def to_velocity(self, pixel, unit='km/s'): |
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| 15 | """ |
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| 16 | Convert a channel/pixel value to a velocity. |
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| 17 | """ |
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| 18 | umap = {'km/s': 1, 'm/s': 1e-3} |
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| 19 | return _coordinate.to_velocity(self, pixel)/umap[unit] |
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