Reference Ellipsoids and Geodetic Datum Transformation Parameters (Local to WGS-84)

<CENTER><B><FONT size=5></FONT></B> </CENTER>
<CENTER><FONT color=#0909f7><B><FONT size=5>Reference Ellipsoids</FONT></B> </FONT></CENTER>
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<CENTER><FONT color=#0909f7><B><FONT size=5>and</FONT></B> </FONT></CENTER>
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<CENTER><FONT color=#0909f7><B><FONT size=5>Geodetic Datum Transformation Parameters (Local to WGS-84)</FONT></B> </FONT></CENTER>
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<CENTER><FONT color=#0909f7><B><FONT size=5>From</FONT></B> </FONT></CENTER>
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<CENTER><FONT color=#0909f7><B><FONT size=5>NIMA 8350.2 4 July 1977</FONT></B> </FONT></CENTER>
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<CENTER><FONT color=#0909f7><B><FONT size=5>and</FONT></B> </FONT></CENTER>
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<CENTER><FONT color=#a0a0a0><B><FONT color=#0909f7 size=5>MADTRAN 1 October 1996</FONT></B> </FONT></CENTER>
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<LI><B><FONT size=5>Reference Ellipsoids</FONT></B> </LI></UL>
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<TABLE border=2>

<TR>
<TD width=252><B><FONT size=5>Ellipsoid</FONT></B></TD>
<TD width=186><B><FONT size=5>Semi-major axis</FONT></B>  </TD>
<TD width=180><B><FONT size=5>1/flattening</FONT></B></TD></TR>
<TR>
<TD width=252><FONT size=5>Airy 1830, </FONT></TD>
<TD width=186><FONT size=5>6377563.396</FONT> </TD>
<TD width=180><FONT size=5>299.3249646</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Modified Airy</FONT></TD>
<TD width=186><FONT size=5>6377340.189</FONT> </TD>
<TD width=180><FONT size=5>299.3249646</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Australian National </FONT></TD>
<TD width=186><FONT size=5>6378160</FONT></TD>
<TD width=180><FONT size=5>298.25</FONT> </TD></TR>
<TR>
<TD width=252><FONT size=5>Bessel 1841 (Namibia) </FONT></TD>
<TD width=186><FONT size=5>6377483.865</FONT></TD>
<TD width=180><FONT size=5>299.1528128</FONT> </TD></TR>
<TR>
<TD width=252><FONT size=5>Bessel 1841</FONT></TD>
<TD width=186><FONT size=5>6377397.155</FONT> </TD>
<TD width=180><FONT size=5>299.1528128</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Clarke 1866,</FONT></TD>
<TD width=186><FONT size=5>6378206.4</FONT> </TD>
<TD width=180><FONT size=5>294.9786982</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Clarke 1880,</FONT></TD>
<TD width=186><FONT size=5>6378249.145</FONT> </TD>
<TD width=180><FONT size=5>293.465</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Everest (India 1830)"</FONT>  </TD>
<TD width=186><FONT size=5>6377276.345</FONT></TD>
<TD width=180><FONT size=5>300.8017</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Everest (Sabah Sarawak)</FONT>  </TD>
<TD width=186><FONT size=5>6377298.556</FONT></TD>
<TD width=180><FONT size=5>300.8017</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Everest (India 1956)</FONT></TD>
<TD width=186><FONT size=5>6377301.243</FONT></TD>
<TD width=180><FONT size=5>300.8017</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Everest (Malaysia 1969)</FONT>  </TD>
<TD width=186><FONT size=5>6377295.664</FONT></TD>
<TD width=180><FONT size=5>300.8017</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Everest (Malay. ; Sing)</FONT>  </TD>
<TD width=186><FONT size=5>6377304.063</FONT></TD>
<TD width=180><FONT size=5>300.8017</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Everest (Pakistan)</FONT></TD>
<TD width=186><FONT size=5>6377309.613</FONT></TD>
<TD width=180><FONT size=5>300.8017</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Modified Fischer 1960</FONT></TD>
<TD width=186><FONT size=5>6378155</FONT></TD>
<TD width=180><FONT size=5>298.3</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Helmert 1906</FONT></TD>
<TD width=186><FONT size=5>6378200</FONT>  </TD>
<TD width=180><FONT size=5>298.3</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Hough 1960</FONT></TD>
<TD width=186><FONT size=5>6378270</FONT>  </TD>
<TD width=180><FONT size=5>297</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>Indonesian 1974</FONT></TD>
<TD width=186><FONT size=5>6378160</FONT>  </TD>
<TD width=180><FONT size=5>298.247</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>International 1924</FONT></TD>
<TD width=186><FONT size=5>6378388</FONT></TD>
<TD width=180><FONT size=5>297</FONT>  </TD></TR>
<TR>
<TD width=252><FONT size=5>Krassovsky 1940</FONT></TD>
<TD width=186><FONT size=5>6378245</FONT>  </TD>
<TD width=180><FONT size=5>298.3</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>GRS 80</FONT></TD>
<TD width=186><FONT size=5>6378137</FONT>  </TD>
<TD width=180><FONT size=5>298.257222101</FONT></TD></TR>
<TR>
<TD width=252><FONT size=5>South American 1969</FONT></TD>
<TD width=186><FONT size=5>6378160</FONT></TD>
<TD width=180><FONT size=5>298.25</FONT>  </TD></TR>
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<TD width=252><FONT size=5>WGS 72</FONT></TD>
<TD width=186><FONT size=5>6378135</FONT>  </TD>
<TD width=180><FONT size=5>298.26</FONT></TD></TR>
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<TD width=252><FONT size=5>WGS 84</FONT></TD>
<TD width=186><FONT size=5>6378137</FONT>  </TD>
<TD width=180><FONT size=5>298.257223563</FONT></TD></TR></TABLE>
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为什么我们国家使用的两种坐标使用的基准与WGS-84的转换参数一直不公开？

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