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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>旋转，</span><span lang=EN-US>Y</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>旋转，</span><span
lang=EN-US>Z</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>旋转，尺度变化</span><span lang=EN-US>K</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>视为</span><span lang=EN-US>0</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，所以三参数只是七参数的一种特例。在本软件中提供了计算三参数、七参数的功能。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>在一个椭球的不同坐标系中转换可能会用到平面转换，现阶段一般分为四参数和平面网格拟合两种方法，以四参数法在国内用的较多，举个例子，在深圳既有北京</span><span
lang=EN-US>54</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>坐标又有深圳坐标，在这两种坐标之间转换就用到四参数，计算四参数需要两个已知点。更精确的可以提供网格拟合数据</span><span
lang=EN-US>,</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>本软件提供计算和应用四参数的功能</span><span
lang=EN-US>,</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>也提供了网格拟合的功能。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>另外，还有高程拟合的问题，大地水准面模型在国内用户中很少会用到，但在国际上已经是标准之一，本软件提供最常用的</span><span
lang=EN-US>EGM96</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>模型和</span><span lang=EN-US>Geoid99</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>模型。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>最后，本软件提供了</span><span
lang=EN-US>ITRF</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>框架转换方法，涉及到</span><span lang=EN-US>ITRF2000</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>和以往用过的</span><span lang=EN-US>ITRF96</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，</span><span lang=EN-US>ITRF93</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>之间的换算，对于方面的需求的用户是个尝试。</span></p>
<p class=MsoNormal><span lang=EN-US><span style='mso-tab-count:1'> </span></span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>现在举个例子说明：在珠江有一个测区，需要完成</span><span lang=EN-US>WGS-84</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>坐标到珠江坐标系（</span><span lang=EN-US>54</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>椭球）的坐标转换，整个转换过程是</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>这样的：</span></p>
<p class=MsoNormal><span lang=EN-US><span style='mso-tab-count:4'> </span></span></p>
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<p class=MsoNormal><span lang=EN-US>WGS-84</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>经纬度</span></p>
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<p class=MsoNormal><span lang=EN-US>WGS-84</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>空间直角</span></p>
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<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0;
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
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<p class=MsoNormal style='text-indent:5.25pt;mso-char-indent-count:.5;
mso-char-indent-size:10.5pt;mso-char-indent-size:10.5pt'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>北京</span><span lang=EN-US>54</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
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<p class=MsoNormal style='text-indent:5.25pt;mso-char-indent-count:.5;
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>北京</span><span lang=EN-US>54</span><span
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<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0;
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<p class=MsoNormal style='text-indent:5.25pt;mso-char-indent-count:.5;
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>北京</span><span lang=EN-US>54</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
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