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measures.baseline - Function

	Package	general
	Module	measures
	Tool	measures

define a baseline measure

Synopsis
baseline(rf, v0, v1, v2, off)

Arguments

rf	in	reference code
		Allowed:	coded string
v0	in	longitude or x
		Allowed:	quantity
		Default:	0..
v1	in	latitude or y
		Allowed:	quantity
v2	in	height or z
		Allowed:	quantity
off	in	optional offset
		Allowed:	baseline measure
		Default:	F

Returns
baseline measure

Description
baseline defines a baseline measure from the CLI. It has to specify a reference code, baseline quantity values (see introduction for the action on a scalar quantity with either a vector or scalar value, and when a vector of quantities is given), and optionally it can specify an offset, which in itself has to be a baseline. Allowable reference codes are ITRF and the direction ones.
Note that additional ones may become available. Check in Glish with:

- dm.listcodes(dm.baseline())
[normal=J2000 JMEAN JTRUE APP B1950 BMEAN BTRUE GALACTIC HADEC AZEL
        AZELSW AZELNE AZELGEO AZELSWGEO AZELNEGEO JNAT ECLIPTIC
        MECLIPTIC TECLIPTIC SUPERGAL ITRF TOPO, extra=]

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

Example

- dm.baseline('itrf','30deg','40deg','10m')
[type=baseline, refer=ITRF, m2=[value=10, unit=m],
	 m1=[unit=rad, value=0.698131701], m0=[unit=rad, value=0.523598776]]
- dm.measure(dm.baseline('itrf','30deg','40deg','10m'), 'j2000')
[type=baseline, refer=J2000, m2=[value=10, unit=m],
		 m1=[unit=rad, value=0.698073433],
		  m0=[unit=rad, value=-1.74254263]]