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### A.4.12 Sphere Plot Window

Sphere Plot Window

The Sphere Plot () plots spherical polar coordinates in an isotropic 3-dimensional space. Although the supplied coordinates are spherical polar, the visible space is not necessarily centred on the coordinate origin, and the visible axes are Cartesian. In many respects this works like the Cube Plot Window

The positional coordinates are Longitude and Latitude (in degrees) and Radius.

The sphere plot offers the following plot controls:

- Position Layer Control, with these form options:
  - Mark
  - Size
  - SizeXY
  - Polygon
  - Label
  - Line3d
  - Contour
- Pair Layer Control, with the following plot controls:
  - Link2
  - Mark2
- Area Layer Control, with the following plot control:
  - Area
  - Central
  - Area Label
- Quad Layer Control, with the following plot controls:
  - Poly4
  - Mark4
- SphereGrid Layer Control

Note that use of the Auto, Density and Weighted shading modes can be confusing in 3 dimensions with multiple datasets. This is because pixels based on density along a line of sight are not located at any point on that line, so shaded pixels can't appear at the "right" place in the 3-d space. The same applies to a lesser extent with contours. They work fine with a single dataset though.

See the Window Overview for features common to all plotting windows. The following subsections describe navigation and axis configuration.

- A.4.12.1 Sphere Navigation
- A.4.12.2 Sphere Axes Control

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk