source: branches/newfiller/python/coordinate.py@ 1917

Last change on this file since 1917 was 1757, checked in by Kana Sugimoto, 14 years ago

New Development: Yes

JIRA Issue: Yes (CAS-2211)

Ready for Test: Yes

Interface Changes: Yes

What Interface Changed: ASAP 3.0.0 interface changes

Test Programs:

Put in Release Notes: Yes

Module(s): all the CASA sd tools and tasks are affected.

Description: Merged ATNF-ASAP 3.0.0 developments to CASA (alma) branch.

Note you also need to update casa/code/atnf.


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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