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<?xml version="1.0" encoding="ISO-8859-1"?>
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<refentry id="fn_haversine_deg_km">
<refmeta>
<refentrytitle>haversine_deg_km</refentrytitle>
<refmiscinfo>geo</refmiscinfo>
</refmeta>
<refnamediv>
<refname>haversine_deg_km</refname>
<refpurpose>Given latitudes and longitudes of two points in degrees, calculates the approximate distance between
that points in kilometers</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_haversine_deg_km">
<funcprototype id="fproto_haversine_deg_km">
<funcdef><function>haversine_deg_km</function></funcdef>
<paramdef>in <parameter>lat1</parameter> double precision</paramdef>
<paramdef>in <parameter>long1</parameter> double precision</paramdef>
<paramdef>in <parameter>lat2</parameter> double precision</paramdef>
<paramdef>in <parameter>long2</parameter> double precision</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_haversine_deg_km">
<title>Description</title>
<para>The function calculates the approximate distance between two points, using haversine formula with an adjustment
for case when points are ends of some diameter.</para>
<para>Note that the order of arguments is latitude-longitude, not longitude-latitude.</para>
</refsect1>
<refsect1 id="params_haversine_deg_km">
<title>Parameters</title>
<refsect2><title>lat1</title><para>latitude</para></refsect2>
<refsect2><title>long1</title><para>longitude</para></refsect2>
<refsect2><title>lat2</title><para>latitude</para></refsect2>
<refsect2><title>long2</title><para>longitude</para></refsect2>
</refsect1>
<refsect1 id="ret_haversine_deg_km"><title>Return Types</title>
<para>The function returns distance in kilometers as double precision.</para>
</refsect1>
<refsect1 id="examples_haversine_deg_km">
<title>Examples</title>
<example id="ex_haversine_deg_km"><title>Simple example</title>
<screen><![CDATA[
-- select haversine_deg_km (-90,0,90,0)
haversine_deg_km
VARCHAR
_______________________________________________________________________________
20003.88915449353
-- select haversine_deg_km (0,0,0,180) - haversine_deg_km (-90,0,90,0)
temp
VARCHAR
_______________________________________________________________________________
33.61918829571368
]]>
</screen>
</example>
</refsect1>
<refsect1 id="seealso_haversine_deg_km">
<title>See Also</title>
<para><link linkend="fn_earth_radius"><function>earth_radius()</function></link></para>
<para><link linkend="fn_dist_from_point_to_line_segment"><function>dist_from_point_to_line_segment()</function></link></para>
<para><link linkend="fn_st_point"><function>st_point</function></link></para>
<para><link linkend="fn_st_x"><function>st_x</function></link></para>
<para><link linkend="fn_st_y"><function>st_y</function></link></para>
<para><link linkend="fn_ST_Z"><function>ST_Z</function></link></para>
<para><link linkend="fn_st_distance"><function>st_distance</function></link></para>
<para><link linkend="fn_ST_SetSRID"><function>ST_SetSRID</function></link></para>
<para><link linkend="fn_st_astext"><function>st_astext</function></link></para>
<para><link linkend="fn_st_geomfromtext"><function>st_geomfromtext</function></link></para>
<para><link linkend="fn_st_intersects"><function>st_intersects</function></link></para>
<para><link linkend="fn_st_contains"><function>st_contains</function></link></para>
<para><link linkend="fn_st_within"><function>st_within</function></link></para>
<para><link linkend="fn_isgeometry"><function>isgeometry</function></link></para>
<para><link linkend="fn_geo_insert"><function>geo_insert</function></link></para>
<para><link linkend="fn_geo_delete"><function>geo_delete</function></link></para>
<para><link linkend="fn_rdf_geo_add"><function>DB.DBA.RDF_GEO_ADD</function></link></para>
<para><link linkend="fn_rdf_geo_fill"><function>DB.DBA.RDF_GEO_FILL</function></link></para>
</refsect1>
</refentry>
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