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Last change
on this file since 2612 was 1697, checked in by Malte Marquarding, 16 years ago |
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Some minor tidy up and documentation
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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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