[求助]请大家帮忙解答等高线生成dem的有关问题，谢谢

<P >我的地形图是<FONT face="Times New Roman">1</FONT>：<FONT face="Times New Roman">10</FONT>万的，想用数字化的等高线生成<FONT face="Times New Roman">dem</FONT>然后进行坡度、坡向分析。</P>
<P ><FONT face="Times New Roman">1</FONT>、我的等高线，高程点都画好了，不知道是点图层和线图层都用上还是只用线图层就行。<FONT face="Times New Roman">3d</FONT>－<FONT face="Times New Roman">create tin from feature</FONT>生成<FONT face="Times New Roman">tin</FONT>后，用<FONT face="Times New Roman">3D</FONT>－<FONT face="Times New Roman">convert</FONT>－<FONT face="Times New Roman">tin-raster</FONT>时出现对话框不知怎样填。<FONT face="Times New Roman">z factor</FONT>和<FONT face="Times New Roman">cell size</FONT>后面的数字用改么？怎么改？什么意思呢？</P>
<P ><FONT face="Times New Roman">2</FONT>、生成<FONT face="Times New Roman">dem</FONT>后怎样分析海拔、坡度、坡向呢</P>

<P><FONT face="Times New Roman">z factor是z比例，一般不需要修改</FONT></P>
<P><FONT face="Times New Roman">cell size指dem分析栅格大小</FONT></P>
<P>坡度、坡向就在surface Analysis里面</P>