📄 mapobject学习笔记－第六讲 mo中的坐标和坐标系_魏国强 的 博客.htm
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<DIV class=tit>MapObject学习笔记－第六讲 MO中的坐标和坐标系</DIV>
<DIV class=date>2008-01-07 23:08</DIV>
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<P><FONT size=2>(转自</FONT><A class=HeaderMainTitle
href="http://www.cnblogs.com/gispeng/"><FONT
size=2>GIS雲中飛鹏</FONT></A><FONT size=2>)</FONT></P><FONT size=2>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><STRONG><SPAN
style="FONT-SIZE: 12pt">一、坐标系对象</SPAN></STRONG></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><STRONG><SPAN>1</SPAN></STRONG><STRONG><SPAN>、坐标对象概述</SPAN></STRONG></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>MO</SPAN><SPAN>中提供了一系列坐标系对象（也称为投影对象）来控制和操作地图的坐标系统，如</SPAN><SPAN>projcoordsys</SPAN><SPAN>（投影坐标系统）、</SPAN><SPAN>Geocoordsys</SPAN><SPAN>（地理坐标系统）、</SPAN><SPAN>Datum</SPAN><SPAN>（基准面）、</SPAN><SPAN>PrimeMeridian</SPAN><SPAN>（本初子午线）、</SPAN><SPAN>Projection</SPAN><SPAN>（投影）、</SPAN><SPAN>Spheroid</SPAN><SPAN>（地球椭圆体）、</SPAN><SPAN>Unit</SPAN><SPAN>（单位）、</SPAN><SPAN>Geotransformton</SPAN><SPAN>（地理坐标转换）等。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>这些对象都可以在程序中定义，例如：</SPAN><SPAN>Dim
thePrime As New MapObjects2.PrimeMeridian</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><BR
style="mso-ignore: vglayout"
clear=all><SPAN>投影对象之间的部分关系如图所示。一个</SPAN><SPAN>Datum</SPAN><SPAN>对象有</SPAN><SPAN>Spheroid</SPAN><SPAN>属性，</SPAN><SPAN>Geocoordsys</SPAN><SPAN>对象包括有</SPAN><SPAN>Datum</SPAN><SPAN>和</SPAN><SPAN>PrimeMeridian</SPAN><SPAN>属性。<BR></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN><BR><IMG
height=276 src="MapObject学习笔记－第六讲 MO中的坐标和坐标系_魏国强 的 博客.files/snap.jpg"
width=553
border=0><BR><BR>在</SPAN><SPAN>MO</SPAN><SPAN>中，坐标系的产生和转换是用</SPAN><SPAN>POSC</SPAN><SPAN>（</SPAN><SPAN>Petrochemical
open software
consortium</SPAN><SPAN>）模型来管理的，这个模型定义了不同的测量和绘图坐标系与他们之间的关系。在</SPAN><SPAN>POSC</SPAN><SPAN>模型下的每个对象都有一个唯一的坐标系编码（利用</SPAN><SPAN>Type</SPAN><SPAN>属性操作），它定义了该对象在</SPAN><SPAN>POSC</SPAN><SPAN>模型下的坐标系属性（</SPAN><SPAN>CoordinateSystem</SPAN><SPAN>）。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>设置和改变对象的</SPAN><SPAN>CoordinateSystem</SPAN><SPAN>属性，会改变图形的外观。</SPAN><SPAN>Geotransformton</SPAN><SPAN>对象可以转换</SPAN><SPAN>MapLayer</SPAN><SPAN>的投影方式，也可以转换单个图形对象。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><STRONG><SPAN>2</SPAN></STRONG><STRONG><SPAN>、地理坐标系和投影坐标系</SPAN></STRONG></P>
<P class=MsoNormal
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