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<sect1 id="geoid.c"><title><filename>geoid.c</filename></title>
<informaltable frame='all' pgwide='1'>
<tgroup cols='2'>
<colspec colname='c1'></colspec>
<colspec colname='c2'></colspec>
<spanspec spanname='s1' namest='c1' nameend='c2'></spanspec>
<thead>
<row>
<entry>Functions:-</entry><entry>Provides conversion between the ECEF and WGS84 co-ordinate reference systems.</entry>
</row>
</thead>
<tfoot>
<row>
<entry spanname='s1' align='left'>Notes based on <function>$Id: geoid.c 4257 2007-01-18 03:56:43Z ckuethe $</function></entry>
</row>
</tfoot>
<tbody>
<row>
<entry><function>static double bilinear(double x1, double y1, double x2, double y2, double x, double y, double z11, double z12, double z21, double z22)</function></entry>
<entry><para>This is a piece of mathematical manipulation only used internally in this code, so wrestle with it if you will!</para></entry>
</row>
<row>
<entry><function>double wgs84_separation(double lat, double lon)</function></entry>
<entry><para>This is used by drivers to get the separation of MSL from the WGS84 datum at a pair of Latitude/Longitude co-ordinates. The data is in a pre-defined table.</para></entry>
</row>
<row>
<entry><function>void ecef_to_wgs84fix(struct gps_data_t *gpsdata, double x, double y, double z, double vx, double vy, double vz)</function></entry>
<entry><para>This does exactly what it says! Co-ordinate system conversion from ecef to the wgs84 equivalent.</para></entry>
</row>
<row>
<entry><function>static double fix_minuz(double d)</function></entry>
<entry><para>This forces a value of -0.0 to be the same as 0.0 so that certain trig functions act in a predictable manner.</para></entry>
</row>
<row>
<entry><function>int main(int argc, char **argv)</function></entry>
<entry><para>This is a local test routine which exercises the other code for debugging purposes. It is normally shut off by an <function>#ifdef</function>.</para></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect1>
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