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- Parameters of selected ground-based observing stations
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<H2><A NAME="SECTION000345000000000000000"></A><A NAME="____palObs_"></A>
<BR>
palObs
palObs
- Parameters of selected ground-based observing stations
</H2>
<DL>
<DT><STRONG>Description:</STRONG></DT>
<DD><DL>
<DD>Station numbers, identifiers, names and other details are
subject to change and should not be hardwired into
application programs.
<P>
All characters in <TT>"</TT>c<TT>"</TT> up to the first space are
checked; thus an abbreviated ID will return the parameters
for the first station in the list which matches the
abbreviation supplied, and no station in the list will ever
contain embedded spaces. <TT>"</TT>c<TT>"</TT> must not have leading spaces.
<P>
IMPORTANT - BEWARE OF THE LONGITUDE SIGN CONVENTION. The
longitude returned by sla_OBS is west-positive in accordance
with astronomical usage. However, this sign convention is
left-handed and is the opposite of the one used by geographers;
elsewhere in PAL the preferable east-positive convention is
used. In particular, note that for use in palAop, palAoppa
and palOap the sign of the longitude must be reversed.
<P>
Users are urged to inform the author of any improvements
they would like to see made. For example:
<P>
typographical corrections
more accurate parameters
better station identifiers or names
additional stations
</DD>
</DL>
<BR>
</DD>
<DT><STRONG>Invocation:</STRONG></DT>
<DD><DL>
<DD><TT> int palObs( size_t n, const char <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> c,
char <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> ident, size_t identlen,
char <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> name, size_t namelen,
double <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> w, double <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> p, double <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> h );
</TT>
</DD>
</DL>
<BR>
</DD>
<DT><STRONG>Arguments:</STRONG></DT>
<DD>
<BR> <DL>
<DT><STRONG>
n = size_t (Given)
</STRONG></DT>
<DD>
Number specifying the observing station. If 0
the identifier in <TT>"</TT>c<TT>"</TT> is used to determine the
observing station to use.
</DD>
<DT><STRONG>
c = const char <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> (Given)
</STRONG></DT>
<DD>
Identifier specifying the observing station for
which the parameters should be returned. Only used
if n is 0. Can be NULL for n<SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img4.png"
ALT="$>$"></SPAN>0. Case insensitive.
</DD>
<DT><STRONG>
ident = char <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> (Returned)
</STRONG></DT>
<DD>
Identifier of the observing station selected. Will be
identical to <TT>"</TT>c<TT>"</TT> if n==0. Unchanged if <TT>"</TT>n<TT>"</TT> or <TT>"</TT>c<TT>"</TT>
do not match an observing station. Should be at least
11 characters (including the trailing nul).
</DD>
<DT><STRONG>
identlen = size_t (Given)
</STRONG></DT>
<DD>
Size of the buffer <TT>"</TT>ident<TT>"</TT> including trailing nul.
</DD>
<DT><STRONG>
name = char <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> (Returned)
</STRONG></DT>
<DD>
Full name of the specified observing station. Contains <TT>"</TT>?<TT>"</TT>
if <TT>"</TT>n<TT>"</TT> or <TT>"</TT>c<TT>"</TT> did not correspond to a valid station. Should
be at least 41 characters (including the trailing nul).
</DD>
<DT><STRONG>
w = double <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> (Returned)
</STRONG></DT>
<DD>
Longitude (radians, West <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$+$"></SPAN>ve). Unchanged if observing
station could not be identified.
</DD>
<DT><STRONG>
p = double <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> (Returned)
</STRONG></DT>
<DD>
Geodetic latitude (radians, North <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$+$"></SPAN>ve). Unchanged if observing
station could not be identified.
</DD>
<DT><STRONG>
h = double <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> (Returned)
</STRONG></DT>
<DD>
Height above sea level (metres). Unchanged if observing
station could not be identified.
</DD>
</DL>
<BR>
</DD>
<DT><STRONG>Returned Value:</STRONG></DT>
<DD>
<BR> <DL>
<DT><STRONG>
palObs = int
</STRONG></DT>
<DD>
0 if an observing station was returned. -1 if no match was
found.
</DD>
</DL>
<BR>
</DD>
<DT><STRONG>Notes:</STRONG></DT>
<DD><UL>
<LI>Differs from the SLA interface in that the output short name
is not the same variable as the input short name. This simplifies
consting. Additionally the size of the output buffers are now
specified in the API and a status integer is returned.
</LI>
</UL>
<BR>
</DD>
</DL>
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