[求助]制作DEM

我要是在ENVI下用卫片制作DEM是怎样一种思路呢，我在Overlay下的Contour lines提取了等高线，但存出来是.lev文件，怎样转成evf文件呢，还是我的思路根本就不对，不会还要用到IDL吧

对于你的问题我就不太懂..不过我也挺想做DEM的..老师说对我初学者太难了..

<P>要做DEM直接用ENVI的立体象对功能就行了.</P>

4.2有直接提取的功能 4.1 4.0 没有

<P>是啊，我也在提取ＤＥＭ但思路很不清晰，有知道的ＥＭＡＩＬ我啊<BR>fxyjg@126.com</P>

<STRONG><FONT face=Verdana color=#61b713>mueryer,怎么进行直接提取呀,能 说详细些吗?? 急急急!!!!!</FONT></STRONG>

<P>The DEM Extraction Wizard <BR>The DEM Extraction Wizard walks you through nine steps to extract a DEM. The Wizard allows you to step forward, backwards, and to save the workflow at any step so that you can continue at a later time. The functionality provided in the nine steps is also available to run separately from the Wizard using the Topographic menu on the ENVI main menu bar. The Wizard workflow is illustrated in Figure 2-1, and the nine steps are outlined here. <BR>Step 1: Selecting the Stereo Image Pair - Select the stereo pair, and supply the minimum and maximum elevation of the region.<BR> <BR>Step 2: Selecting Ground Control Points - (Optional) Select the source for the Ground Control Point data.<BR> <BR>Step 3: Viewing, Adding, Editing GCPs - Edit, add, and view GCPs. You can choose to read in a GCP file and edit it, or manually enter the GCPs in Step 2.<BR> <BR>Step 4: Collecting Tie Points - Select the source of the tie points required for DEM extraction. You can have them automatically generated by the Wizard, load an existing tie points file, or choose to enter the tie points yourself.<BR> <BR>Step 3: Viewing, Adding, Editing GCPs - Edit, add, and view tie points. <BR> <BR>Step 6: Generating Epipolar Images - Create and save the left and right epipolar images.<BR> <BR>Step 7: Setting Output DEM Projection - Set the projection system, the output DEM pixel size, and the number of rows and columns in the output.<BR> <BR>Step 8: Selecting DEM Extraction Parameters - Define minimum correlation, moving window size and terrain detail, and specify where to save your DEM result.<BR> <BR>Step 9: Examining the DEM Result - Display your DEM result. You may want to use the DEM Editing Tool to edit the displayed the result.<BR>These workflow steps are described in more detail in the following sections. <BR></P>