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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>vtdata library: vtProjection Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.5 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li id="current"><a href="annotated.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>vtProjection Class Reference</h1><!-- doxytag: class="vtProjection" --><a href="classvtProjection-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classvtProjection.html">vtProjection</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#a6cc3788a48c4b1fc74e4f1d833422a9">operator=</a> (const <a class="el" href="classvtProjection.html">vtProjection</a> &ref)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#f128c88e4c3dadf4bbf478c45f4b3ab8">operator==</a> (const <a class="el" href="classvtProjection.html">vtProjection</a> &ref) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#ded1c5b2449aefb575ef928eb2347bbe">operator!=</a> (const <a class="el" href="classvtProjection.html">vtProjection</a> &ref) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#530f529e2a0152eea2e03f3b5165942e">SetUTMZone</a> (int iZone)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#c512de92d741ac8afdabeae997ed989d">GetUTMZone</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">OGRErr </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#9ce80cb71e2a57a65559a6a6ca9ffef4">SetDatum</a> (int iDatum)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#3b704368ea12c9c6026a4c7ffe8e27c7">GetDatum</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">LinearUnits </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#ac9bf92d8cb40bea4617896148677b11">GetUnits</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#a81d22a5163a78c932ee90761ebb8af6">GuessEPSGCode</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">OGRErr </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#c54c3ec4c36206816ffb6b8e4c98e3a9">SetGeogCSFromDatum</a> (int iDatum)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#467fd1613be10b952ba5970fa1ec2fd8">SetProjectionSimple</a> (bool bUTM, int iUTMZone, int iDatum)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#d1f275b40ebce95c287495d27cd1b824">SetSpatialReference</a> (OGRSpatialReference *pRef)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#a616c86b9302bc02b5a364961547914f">GetProjectionName</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#38fde9a1b2ae3f5fe89f2554aa144a0b">GetProjectionNameShort</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#1e21b6f4444af5f43fd1c8e8f7365cba">GetTextDescription</a> (char *type, char *value) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#74319ac3b6fa6e2f11009bfbc9fb6b54">SetTextDescription</a> (const char *type, const char *value)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#38ec7ac473e159b0a6d5e6100854e631">ReadProjFile</a> (const char *filename)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#12ba5c50c8136299ab6c9b1bbac8d964">WriteProjFile</a> (const char *filename) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="fdf6b3995d616e69362d733dc25e1800"></a><!-- doxytag: member="vtProjection::SetDymaxion" ref="fdf6b3995d616e69362d733dc25e1800" args="(bool bTrue)" -->void </td><td class="memItemRight" valign="bottom"><b>SetDymaxion</b> (bool bTrue)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="76a09165f24bc61764ce821dc9b46dbb"></a><!-- doxytag: member="vtProjection::IsDymaxion" ref="76a09165f24bc61764ce821dc9b46dbb" args="() const " -->bool </td><td class="memItemRight" valign="bottom"><b>IsDymaxion</b> () const </td></tr><tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtProjection.html#701ad2b1713be3ecb10ee1c4dffe01f4">GeodesicDistance</a> (const <a class="el" href="classDPoint2.html">DPoint2</a> &in, const <a class="el" href="classDPoint2.html">DPoint2</a> &out, bool bQuick=false)</td></tr><tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="92ebba4742cd35c0c4128c017679e426"></a><!-- doxytag: member="vtProjection::LogDescription" ref="92ebba4742cd35c0c4128c017679e426" args="() const " -->void </td><td class="memItemRight" valign="bottom"><b>LogDescription</b> () const </td></tr><tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4e1f56c43abaad450a0caf8dfffbc128"></a><!-- doxytag: member="vtProjection::m_bDymaxion" ref="4e1f56c43abaad450a0caf8dfffbc128" args="" -->bool </td><td class="memItemRight" valign="bottom"><b>m_bDymaxion</b></td></tr></table><hr><a name="_details"></a><h2>Detailed Description</h2>The vtProjection class represents an earth coordinate reference system (CRS), which is generally a projected coordinate system (PCS). It is based on the class <a href="http://www.gdal.org/ogr/classOGRSpatialReference.html">OGRSpatialReference</a> which represents a full OpenGIS Spatial Reference System. The vtProjection class extends OGRSpatialReference with several useful methods. <p><hr><h2>Member Function Documentation</h2><a class="anchor" name="701ad2b1713be3ecb10ee1c4dffe01f4"></a><!-- doxytag: member="vtProjection::GeodesicDistance" ref="701ad2b1713be3ecb10ee1c4dffe01f4" args="(const DPoint2 &in, const DPoint2 &out, bool bQuick=false)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">double vtProjection::GeodesicDistance </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">const <a class="el" href="classDPoint2.html">DPoint2</a> & </td> <td class="mdname" nowrap> <em>geo1</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>const <a class="el" href="classDPoint2.html">DPoint2</a> & </td> <td class="mdname" nowrap> <em>geo2</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>bool </td> <td class="mdname" nowrap> <em>bQuick</em> = <code>false</code></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"><code> [static]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Given two geographic coordinates (longitude/latitude in degrees), return the geodesic arc distance in meters. The WGS84 spheroid is used. </td> </tr></table><a class="anchor" name="3b704368ea12c9c6026a4c7ffe8e27c7"></a><!-- doxytag: member="vtProjection::GetDatum" ref="3b704368ea12c9c6026a4c7ffe8e27c7" args="() const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">int vtProjection::GetDatum </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Return the datum as an EPSG code (an integer in the range of 6120 - 6904), or -1 if the datum could not be determined. </td> </tr></table><a class="anchor" name="a616c86b9302bc02b5a364961547914f"></a><!-- doxytag: member="vtProjection::GetProjectionName" ref="a616c86b9302bc02b5a364961547914f" args="() const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">const char * vtProjection::GetProjectionName </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Return a string describing the type of projection.<p><dl compact><dt><b>Example:</b></dt><dd>"Geographic", "Transverse_Mercator", "Albers_Conic_Equal_Area" </dd></dl> </td> </tr></table><a class="anchor" name="38fde9a1b2ae3f5fe89f2554aa144a0b"></a><!-- doxytag: member="vtProjection::GetProjectionNameShort" ref="38fde9a1b2ae3f5fe89f2554aa144a0b" args="() const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">const char * vtProjection::GetProjectionNameShort </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Return a very short string describing the type of projection. <dl compact><dt><b></b></dt><dd>Example values are "Geo", "UTM", "TM", "Albers", "LCC", etc. or "Unknown" if it is unknown. </dd></dl> </td> </tr></table><a class="anchor" name="1e21b6f4444af5f43fd1c8e8f7365cba"></a><!-- doxytag: member="vtProjection::GetTextDescription" ref="1e21b6f4444af5f43fd1c8e8f7365cba" args="(char *type, char *value) const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">bool vtProjection::GetTextDescription </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">char * </td> <td class="mdname" nowrap> <em>type</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>char * </td> <td class="mdname" nowrap> <em>value</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"> const</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td>⌨️ 快捷键说明
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