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`plot2sphere`

:
Draws a sphere plot
`plot2sphere`

draws plots in an isotropic 3-dimensional space
using spherical polar coordinates.
The plotting volume is a cube,
which is viewed from the outside and usually bounded by a
wire frame annotated by Cartesian coordinates.
This viewing cube is not necessarily centered on the coordinate origin.

This plotting geometry is like that used by
`plot2cube`

,
but the coordinate unit size is always the same in the three dimensions,
and the coordinates are specified differently.

Positional coordinates are specified as
`lon`

, `lat`

, `r`

triples,
e.g.:

plot2sphere layer1=mark in1=survey.fits lon1=RA lat1=DEC r1=REDSHIFT

Content is added to the plot by specifying
one or more *plot layers* using the
`layerN`

parameter.
The `N`

part is a suffix applied to
all the parameters affecting a given layer;
any suffix (including the empty string) may be used.
Available layers for this plot type are:
`mark`

,
`size`

,
`sizexy`

,
`link2`

,
`mark2`

,
`poly4`

,
`mark4`

,
`polygon`

,
`area`

,
`central`

,
`label`

,
`arealabel`

,
`line3d`

,
`contour`

,
`spheregrid`

.

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Starlink User Note256

STILTS web page: http://www.starlink.ac.uk/stilts/

Author email: m.b.taylor@bristol.ac.uk

Mailing list: topcat-user@jiscmail.ac.uk