1.3.1.0 measures.position

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measures.position - Function

1.3.1 define a position measure
Description

position defines a position measure from the CLI. It has to specify a reference code, position quantity values (see introduction for the action on a scalar quantity with either a vector or scalar value),

and optionally it can specify an offset, which in itself has to be a position. Allowable reference codes are: WGS84 ITRF (World Geodetic System and International Terrestrial Reference Frame).
Note that additional ones may become available. Check in CASA with:

print "\t----\t position Ex 1 \t----"
print me.listcodes(me.position())
#{’normal’: [’ITRF’, ’WGS84’], ’extra’: []}

The position quantity values should be either longitude (angle), latitude(angle) and height(length); or x,y,z (length). See quantity for possible angle formats.

Arguments


Inputs
rf	reference code
	allowed:	string
	Default:	WGS84
v0	longitude or x
	allowed:	any
	Default:	variant
v1	latitude or y
	allowed:	any
	Default:	variant
v2	height or z
	allowed:	any
	Default:	variant
off	optional offset position measure
	allowed:	any
	Default:	record

Returns
anyrecord

Example

print "\t----\t position Ex 2 \t----"
print me.position(’wgs84’,’30deg’,’40deg’,’10m’)
#{’m0’: {’value’: 0.52359877559829882, ’unit’: ’rad’},
# ’m1’: {’value’: 0.6981317007977319, ’unit’: ’rad’},
# ’m2’: {’value’: 9.9999999999999982, ’unit’: ’m’},
# ’refer’: ’WGS84’,
# ’type’: ’position’}
print me.observatory(’ATCA’)
#{’m0’: {’value’: 2.6101423190348916, ’unit’: ’rad’},
# ’m1’: {’value’: -0.5261379196128062, ’unit’: ’rad’},
# ’m2’: {’value’: 6372960.2577234386, ’unit’: ’m’},
# ’refer’: ’ITRF’,
# ’type’: ’position’}

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