📄 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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style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>在</SPAN><SPAN>MO</SPAN><SPAN>中，每个</SPAN><SPAN>MAP</SPAN><SPAN>或</SPAN><SPAN>MapLayer</SPAN><SPAN>对象都和一个坐标系对象发生联系，这个坐标系对象是地理坐标系对象（</SPAN><SPAN>Geocoordsys</SPAN><SPAN>），也可以是投影坐标系（</SPAN><SPAN>projcoordsys</SPAN><SPAN>）对象。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>地理坐标系（</SPAN><SPAN>Geocoordsys</SPAN><SPAN>）是</SPAN><SPAN>MO</SPAN><SPAN>中最常用的坐标系对象，它用经纬度描述地面上的位置。描述位置时，<SPAN
style="COLOR: red">用</SPAN></SPAN><SPAN
style="COLOR: red">Datum</SPAN><SPAN
style="COLOR: red">属性来设置基准面，用</SPAN><SPAN
style="COLOR: red">PrimeMeridian</SPAN><SPAN
style="COLOR: red">属性来设置其本初子午线，用</SPAN><SPAN
style="COLOR: red">Unit</SPAN><SPAN
style="COLOR: red">属性设置其坐标系单位</SPAN><SPAN>。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>标准的地理坐标系的改变可以通过用</SPAN><SPAN>Type</SPAN><SPAN>属性来设置</SPAN><SPAN>GeographicCoordSys</SPAN><SPAN>常数完成，通过设置其</SPAN><SPAN>Geocoordsys</SPAN><SPAN>、</SPAN><SPAN>PrimeMeridian</SPAN><SPAN>和</SPAN><SPAN>Unit</SPAN><SPAN>属性，也可以设置自定义的投影坐标系。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>投影坐标系（</SPAN><SPAN>projcoordsys</SPAN><SPAN>）用</SPAN><SPAN>X</SPAN><SPAN>和</SPAN><SPAN>Y</SPAN><SPAN>坐标来描述地面上的位置，它用地球椭圆体</SPAN><SPAN>Spheroid</SPAN><SPAN>模拟地球，用</SPAN><SPAN>Projctedcoordsys</SPAN><SPAN>属性表示投影坐标系的来源，用</SPAN><SPAN>Projection</SPAN><SPAN>属性表示投影的计算方法，用</SPAN><SPAN>Unit</SPAN><SPAN>属性设置其坐标系单位。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>标准的投影坐标系的改变可以通过用</SPAN><SPAN>Type</SPAN><SPAN>属性来设置</SPAN><SPAN>ProjectedCoordSys</SPAN><SPAN>常数来完成，通过设置其</SPAN><SPAN>Projctedcoordsys</SPAN><SPAN>、</SPAN><SPAN>Projection</SPAN><SPAN>和</SPAN><SPAN>Unit</SPAN><SPAN>属性，也可以设置自定义的投影坐标系。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>地理坐标系和投影坐标系可以用在</SPAN><SPAN>MapLayer</SPAN><SPAN>图层和</SPAN><SPAN>MAP</SPAN><SPAN>上，通过使用</SPAN><SPAN>Transform</SPAN><SPAN>方法，还可以改变单个图形对象的坐标系。下面的示例程序来判断图层所采用的坐标系，利用到了</SPAN><SPAN>IsProjected</SPAN><SPAN>属性：</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Option
Explicit</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim dc As New
DataConnection</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim layer As
MapObjects2.MapLayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
layset()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>dc.Database =
App.Path + "\..\" + "world"</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set layer = New
MapLayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set
layer.GeoDataset = dc.FindGeoDataset("country")</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.Symbol.Color
= moOrange</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Layers.Add
layer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Refresh</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End Sub</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
Command1_Click()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim coordsys As
Object</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim a As
String</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set layer =
Map1.Layers(0)</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set coordsys =
layer.CoordinateSystem</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>If coordsys.<SPAN
style="COLOR: red">IsProjected </SPAN>Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>a =
MsgBox("</SPAN><SPAN>图层为投影坐标系</SPAN><SPAN>", ,
"</SPAN><SPAN>坐标信息显示框</SPAN><SPAN>")</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>ElseIf Not
coordsys.IsProjected Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>a =
MsgBox("</SPAN><SPAN>图层为地理坐标系</SPAN><SPAN>", ,
"</SPAN><SPAN>坐标信息显示框</SPAN><SPAN>")</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End If</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End Sub</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
Form_Load()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Command1.Caption =
"</SPAN><SPAN>显示坐标信息</SPAN><SPAN>"</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layset</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End Sub</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><STRONG><SPAN>3</SPAN></STRONG><STRONG><SPAN>、坐标系的读取和设置</SPAN></STRONG></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>反映其坐标类型的</SPAN><SPAN>CoordinateSystem</SPAN><SPAN>属性可以用以下方法来读取：</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.CoordinateSystem.Name’</SPAN><SPAN>坐标系名称</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.CoordinateSystem.Type’</SPAN><SPAN>坐标系代码</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>设置</SPAN><SPAN>MapLayer</SPAN><SPAN>或</SPAN><SPAN>Map</SPAN><SPAN>的</SPAN><SPAN>CoordinateSystem</SPAN><SPAN>时，要先定义一个坐标对象，再设置它的</SPAN><SPAN>Type</SPAN><SPAN>属性，最后才可以设置</SPAN><SPAN>CoordinateSystem</SPAN><SPAN>。如：</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim mapGCS As New
MapObjects2.GeoCoordSys</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>mapGCS.Type =
moGeoCS_Adindan</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.CoordinateSystem
= mapGCS</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>图层文件在制作时带有一个坐标系的信息文件，即</SPAN><SPAN>.prj</SPAN><SPAN>文件。下面这个例子是显示一个带有坐标系文件的图层，再设置一个不带有坐标系文件的图层的坐标系信息。示例代码：</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Option
Explicit</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim dc As New
DataConnection</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim layer As
MapObjects2.MapLayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim mapPCS<SPAN
style="mso-spacerun: yes"> </SPAN>As MapObjects2.ProjCoordSys</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim mapgCS As New
MapObjects2.GeoCoordSys</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
layset()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>dc.Database =
App.Path + "\..\" + "world"</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set layer = New
MapLayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set
layer.GeoDataset = dc.FindGeoDataset("country")</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.Symbol.Color
= moOrange</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Layers.Add
layer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set layer = New
MapLayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set
layer.GeoDataset = dc.FindGeoDataset("cities")</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.Symbol.Color
= moGreen</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.Symbol.Size
= 3</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Layers.Add
layer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Refresh</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End Sub</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
Command1_Click()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Set layer =
Map1.Layers(0)</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>If
Map1.Layers(1).CoordinateSystem.IsProjected Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>mapPCS.Type =
Map1.Layers(1).CoordinateSystem.Type</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.CoordinateSystem
= mapPCS</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>ElseIf Not
Map1.Layers(1).CoordinateSystem.IsProjected Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>mapgCS.Type =
Map1.Layers(1).CoordinateSystem.Type</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layer.CoordinateSystem
= mapgCS</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End If</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>List1.Clear</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>addlist</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layset</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End Sub</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
addlist()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim curlayer As
MapObjects2.MapLayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>For Each curlayer
In Map1.Layers</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>If Not
curlayer.CoordinateSystem Is Nothing Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>List1.AddItem
curlayer.Name & ":" & curlayer.CoordinateSystem.Name</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Layers(curlayer.Name).Visible
= True</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Else</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>List1.AddItem
curlayer.Name & ":</SPAN><SPAN>坐标系没有设置！</SPAN><SPAN>"</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.Layers(curlayer.Name).Visible
= False</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End If</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Next
curlayer</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>List1.AddItem
"Map</SPAN><SPAN>控件：</SPAN><SPAN>" &
Map1.CoordinateSystem.Name</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End Sub</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Private Sub
Form_Load()</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>layset</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Command1.Caption =
"</SPAN><SPAN>改变</SPAN><SPAN>"</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>If
Map1.CoordinateSystem Is Nothing Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>If
Map1.Layers(1).CoordinateSystem.IsProjected Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim mapPCS As New
MapObjects2.ProjCoordSys</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>mapPCS.Type =
Map1.Layers(1).CoordinateSystem.Type</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.CoordinateSystem
= mapPCS</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>ElseIf Not
Map1.Layers(1).CoordinateSystem.IsProjected Then</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Dim mapgCS As New
MapObjects2.GeoCoordSys</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>mapgCS.Type =
"4326"</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>Map1.CoordinateSystem
= mapgCS</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End If</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End If</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>addlist</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>End
Sub</SPAN></P><SPAN>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><STRONG><SPAN>4</SPAN></STRONG><STRONG><SPAN>、坐标系的改变</SPAN></STRONG></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN>当改变坐标系时，地图的形状也会发生改变，下面是一个世界地图转换的例子：</SPAN></P>
<P class=MsoNormal
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