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coordinate limits more flexible to allow for other coordinate systems #32

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merged 5 commits into from
Nov 22, 2023
Merged

coordinate limits more flexible to allow for other coordinate systems #32

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64a58b0
coordinate limits more flexible to allow for other coordinate systems
pdowler Nov 8, 2023
350d327
typo fix
pdowler Nov 8, 2023
6783a4f
remove coordinate value limits
pdowler Nov 9, 2023
199e96b
Fix formatting typo
mbtaylor Nov 14, 2023
ee0994f
Refer to previous version by number
mbtaylor Nov 14, 2023
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23 changes: 12 additions & 11 deletions DALI.tex
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Expand Up @@ -747,8 +747,9 @@ \subsection{Point}
12.3 45.6
\end{verbatim}

In spherical coordinates, all longitude values must fall within [0,360] and all
latitude values within [-90,90].
All coordinate values must fall within the minimal range of values appropriate for the
coordnate system in use. For example, equatorial coordinate limits are [0,360) for longitude
and [-90,90] for latitude; other coordinate systems may define different limits.
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There is no general purpose definition of minimum and/or maximum point values, but
specific services may define something that is applicable in a more limited context.
Expand All @@ -765,8 +766,7 @@ \subsection{Circle}
12.3 45.6 0.5
\end{verbatim}

In spherical coordinates, all longitude values must fall within [0,360] and all
latitude values within [-90,90].
Valid coordinate value limits are specified by \verb|xtype="point"| above.

Circle-valued service parameters may include additional metadata like minimum and
or maximum value. These are specified using a custom interpretation of the
Expand Down Expand Up @@ -795,11 +795,12 @@ \subsection{Range}

includes values from 10 to 11 (coordinate1) and from 20 to 21 (coordinate2).

In spherical coordinates, coordinates are longitude followed by latitude; longitude values must
fall within [0,360] and all latitude values within [-90,90]. This range form is used as part of
the value of the POS parameter in \citep{2015ivoa.spec.1223D} and \citep{2017ivoa.spec.0517B}
(see also "shape" below). A range can span the meridian (longitude 0): 359 1 -1 1 is interpreted
as the small (2x2 degree) coordinate range from 359 across the meridian to 1 degree longitude.
Valid coordinate value limits are specified by \verb|xtype="point"| above.
This range form is used as part of the value of the POS parameter in
\citep{2015ivoa.spec.1223D} and \citep{2017ivoa.spec.0517B} (see also "shape" below).
For example, a range can span the meridian (longitude 0): 359 1 -1 1 is interpreted
as the small (2x2 degree) coordinate range from 359 across the meridian to 1 degree
longitude.

Range-valued service parameters may include additional metadata like minimum and
or maximum value. These are specified using a custom interpretation of the
Expand Down Expand Up @@ -828,8 +829,8 @@ \subsection{Polygon}
10.0 10.0 10.2 10.0 10.2 10.2 10.0 10.2
\end{verbatim}

In spherical coordinates, all longitude values must fall within [0,360] and all
latitude values within [-90,90]. Vertices must be ordered such that the polygon
Valid coordinate value limits are specified by \verb|xtype="point"| above.
Vertices must be ordered such that the polygon
winding direction is counter-clockwise (when viewed from the origin toward the
sky) as described in \citep{2007ivoa.spec.1030R}.

Expand Down