什么是DXF文件？

<P 0cm 0cm 0pt 42pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; mso-list: l0 level1 lfo1; tab-stops: list 42.0pt"><FONT face="Times New Roman">1.      </FONT>在<FONT face="Times New Roman">ArcCatalog</FONT>中把等高线<FONT face="Times New Roman">DXF</FONT>文件拉入到<FONT face="Times New Roman">ArcScene</FONT>中显示；<p></p></P>
<P 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 150%; mso-list: l0 level1 lfo1; tab-stops: list 0cm"><FONT face="Times New Roman">2.      </FONT>一个<FONT face="Times New Roman">DXF</FONT>文件在<FONT face="Times New Roman">ArcScene</FONT>中对应若干个<FONT face="Times New Roman">Scene layers</FONT>，分别用右键点击每个<FONT face="Times New Roman">layer</FONT>，选择<FONT face="Times New Roman">Open Attribute Table</FONT>菜单，查看每个<FONT face="Times New Roman">layer</FONT>所包含的属性信息，从而找出包含有<FONT face="Times New Roman">DXF</FONT>文件高程字段信息的<FONT face="Times New Roman">layer</FONT>文件；<p></p></P>
<P 0cm 0cm 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 150%; mso-list: l0 level1 lfo1; tab-stops: list 0cm"><FONT face="Times New Roman">3.      </FONT>在<FONT face="Times New Roman">ArcScene</FONT>中，利用<FONT face="Times New Roman">3D Analyst</FONT>下拉菜单下的<FONT face="Times New Roman">Create/Modify TIN</FONT>→<FONT face="Times New Roman">Create TIN From Features</FONT>工具，在左侧选项框中选中带有高程字段的<FONT face="Times New Roman">layer</FONT>，右侧<FONT face="Times New Roman">Height source</FONT>中选择高程字段，下面<FONT face="Times New Roman">Output TIN</FONT>中输入新建<FONT face="Times New Roman">TIN</FONT>名称，点击<FONT face="Times New Roman">OK</FONT>按钮，即可生成盘区<FONT face="Times New Roman">TIN</FONT>模型。<p></p></P>