Last change
on this file since 2139 was
1697,
checked in by Malte Marquarding, 14 years ago
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Some minor tidy up and documentation
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File size:
652 bytes
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Line | |
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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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