ae+vb.net开发三维可视化界面，请高手指教！

<P >问题一：如何向<FONT face="Times New Roman">globecontrol</FONT>中加载<FONT face="Times New Roman">grid</FONT>栅格高程数据？我尝试了用<FONT face="Times New Roman">addlayertype</FONT>方法加载一个固定路径的<FONT face="Times New Roman">grid</FONT>文件，调试后，能够在<FONT face="Times New Roman">toc</FONT>列表中显示这个图层，但是在<FONT face="Times New Roman">globecontrol</FONT>中却没有显示。而我最终是想用户通过<FONT face="Times New Roman">opendialog</FONT>对话框选择加载<FONT face="Times New Roman">grid</FONT>数据，但是由于<FONT face="Times New Roman">grid</FONT>是没有后缀名的数据格式，所以不知道该如何设置才能够使用户自由加载。如何才能够在<FONT face="Times New Roman">globecontrol</FONT>中显示？</P>
<P >问题二：如何实现当鼠标在<FONT face="Times New Roman">globecontrol</FONT>视窗中移动的时候，在状态栏上显示相应位置的三维坐标信息？</P>
<P>问题三：如何构建用于查询栅格数据的identify工具，我查了msdn，需要用到iidentify,irasterobj接口，但是现在思路比较模糊，不知道正确的思路是什么？</P>
<P>关于问题一，我的代码如下：</P>
<P>'add elevation data to the active globe viewer , as the base height layer<BR>    Private Sub mnu_addelev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnu_addelev.Click<BR>        OpenFileDialog1.Filter = "ESRI GRID(<GRID>)|<GRID>|USGS DEM(*.dem)|*.dem"<BR>        OpenFileDialog1.Title = "select the elevation data to add"<BR>        OpenFileDialog1.Multiselect = True<BR>        OpenFileDialog1.InitialDirectory = "c:\"<BR>        OpenFileDialog1.ShowDialog()<BR>        If OpenFileDialog1.ShowDialog() = DialogResult.OK Then 'when the user event happen<BR>            Dim m_prwsf As IWorkspaceFactory<BR>            m_prwsf = New RasterWorkspaceFactory<BR>            Dim m_pfiledr As String<BR>            m_pfiledr = StrReverse(OpenFileDialog1.FileName)<BR>            Dim i As Integer<BR>            Dim j As Integer<BR>            Dim a As Char<BR>            For i = 1 To Len(m_pfiledr)<BR>                a = GetChar(m_pfiledr, i)<BR>                If a = "\" Then<BR>                    j = i<BR>                    Exit For<BR>                End If<BR>            Next<BR>            Dim m_prdr As String<BR>            Dim p_dir As String<BR>            p_dir = Mid(m_pfiledr, j)<BR>            m_prdr = StrReverse(p_dir)<BR>            Dim m_prfilename As String<BR>            m_prfilename = StrReverse(Mid(m_pfiledr, 1, j - 1))<BR>            ' m_prfilename = Mid(OpenFileDialog1.FileName, Len(OpenFileDialog1.FileName) - j + 2)<BR>            Dim m_Prws As IRasterWorkspace<BR>            m_Prws = DirectCast(m_prwsf.OpenFromFile(m_prdr, 0), IRasterWorkspace)<BR>            Dim m_prdts As IRasterDataset<BR>            m_prdts = m_Prws.OpenRasterDataset(m_prfilename)<BR>            If m_prdts Is Nothing Then 'check whether the raster dataset is existing or not <BR>                MsgBox("please select the correct dataset!", MsgBoxStyle.RetryCancel, "error of adding elevation data")<BR>            End If<BR>            Dim m_pglobe As IGlobe<BR>            m_pglobe = AxGlobeControl1.Globe<BR>            Dim m_prlyr As IRasterLayer<BR>            Dim m_pr As IRaster<BR>            m_prlyr = New RasterLayer<BR>            m_prlyr.CreateFromRaster(m_prdts)<BR>            Dim m_prbands As IRasterBandCollection<BR>            m_prbands = m_prdts<BR>            Dim m_prband As IRasterBand<BR>            m_prband = m_prbands.Item(0)<BR>            Dim m_pdt As IDataset<BR>            m_pdt = m_prband.RasterDataset<BR>            m_prlyr.Name = m_pdt.BrowseName<BR>            Dim m_plyr As ILayer<BR>            m_plyr = New RasterLayer<BR>            m_plyr = m_prlyr<BR>            Dim m_Pelevlyrprop As IGlobeLayerProperties<BR>            m_Pelevlyrprop = New GlobeLayerProperties<BR>            m_Pelevlyrprop.Type = esriGlobeDataType.esriGlobeDataElevation<BR>            Dim m_Plyrex As ILayerExtensions<BR>            m_Plyrex = m_plyr<BR>            m_Plyrex.AddExtension(m_Pelevlyrprop) 'i can not see what effect this does!<BR>            Dim m_Pelevhprop As IGlobeHeightProperties<BR>            m_Pelevhprop = New GlobeHeightProperties<BR>            m_Pelevhprop.BaseOption = esriGlobeLayerBaseOption.esriGlobeLayerBaseSelf<BR>            m_Pelevlyrprop.HeightProperties = m_Pelevhprop<BR>            m_Pelevhprop.Apply(m_pglobe, m_plyr)<BR>            If Not m_plyr Is Nothing Then<BR>                m_pglobe.AddLayerType(m_plyr, esriGlobeLayerType.esriGlobeLayerTypeElevation, True)<BR>                m_pglobe.GlobeDisplay.RefreshViewers()<BR>            Else<BR>                MsgBox("the elevation data is null!please retry!")<BR>            End If<BR>        Else<BR>            Exit Sub<BR>        End If<BR>    End Sub</P>
<P>调试的时候，当点击菜单中的加载高程数据的选项之后，打开文件对话框总是出现两次，而且当选择了数据之后，就会被挂起，在自动窗口中显示：rasterdataset和rasterlayer都为空，请高手帮忙啊！</P>

<P>多谢gis，但是上面你写的代码是往globe中添加栅格数据，能够成功添加？</P>

<P>你先定义一个ibasicmap，就有addlayer方法，先用函数</P>
<P>Public Function OpenRasterDataset(sPath As String, sFileName As String) As IRasterDataset<BR>    ' sPath: directory where dataset resides<BR>    ' sFileName: name of the raster dataset<BR>    On Error GoTo ErrorHandler<BR>    <BR>    ' Create RasterWorkSpaceFactory<BR>    Dim pWSF As IWorkspaceFactory<BR>    Set pWSF = New RasterWorkspaceFactory<BR>    <BR>    ' Get RasterWorkspace<BR>    Dim pRasWS As IRasterWorkspace<BR>    If pWSF.IsWorkspace(sPath) Then<BR>        Set pRasWS = pWSF.OpenFromFile(sPath, 0)<BR>        Set OpenRasterDataset = pRasWS.OpenRasterDataset(sFileName)<BR>    End If<BR>    <BR>    ' Release memeory<BR>    Set pRasWS = Nothing<BR>    Set pWSF = Nothing<BR>    Exit Function<BR>ErrorHandler:<BR>    Set OpenRasterDataset = Nothing<BR>End Function</P>
<P>这样返回了一个raster数据集，就可以加了</P>

三维坐标信息只要把你的坐标转换过来就行，在帮助查看LocateMultiple方法

谢谢gis，但是我的代码也是这样的，为什么就是有问题呢？帮忙看看吧！

<P>' 函数从开发帮助里弄来的，呵呵，打开raster数据应该没问题</P>
<P>Public Function OpenRasterDataset(sPath As String, sFileName As String) As IRasterDataset<BR>    ' sPath: directory where dataset resides<BR>    ' sFileName: name of the raster dataset<BR>    On Error GoTo ErrorHandler<BR>    <BR>    ' Create RasterWorkSpaceFactory<BR>    Dim pWSF As IWorkspaceFactory<BR>    Set pWSF = New RasterWorkspaceFactory<BR>    <BR>    ' Get RasterWorkspace<BR>    Dim pRasWS As IRasterWorkspace<BR>    If pWSF.IsWorkspace(sPath) Then<BR>        Set pRasWS = pWSF.OpenFromFile(sPath, 0)<BR>        Set OpenRasterDataset = pRasWS.OpenRasterDataset(sFileName)<BR>    End If<BR>    <BR>    ' Release memeory<BR>    Set pRasWS = Nothing<BR>    Set pWSF = Nothing<BR>    Exit Function<BR>ErrorHandler:<BR>    Set OpenRasterDataset = Nothing<BR>End Function</P>