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diff --git a/doc/explan_geoid.c.xml b/doc/explan_geoid.c.xml new file mode 100644 index 00000000..071e9579 --- /dev/null +++ b/doc/explan_geoid.c.xml @@ -0,0 +1,45 @@ +<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> + +<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> + +<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> + +</tgroup> +</informaltable> +</sect1> |