何有 发表于 2008-7-26 14:42:57

磁偏角 如何查?──世界磁偏角數據變化的官方網站

<a href="http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp">http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp</a><br><br>
http://www.ngdc.noaa.gov/geomag-web/#declination

<table summary="layout table" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">
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    <tr>
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   <td align="right" valign="bottom" width="45%">
      <div id="header">
       <div id="ngdcsearch">
        <form method="get" action="http://firstgovsearch.gov/search">
       <label><input name="affiliate" checked="checked" value="ngdc.noaa.gov" type="radio">Search NGDC</label>
       <label><input name="affiliate" value="noaa.gov" type="radio">Search NOAA</label>
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<!-- BEGIN GEOMAG TOP NAV BANNER -->
<table summary="layout table" align="center" border="0" cellpadding="0" cellspacing="0" width="90%">
   <tbody>
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    <td colspan="2" bgcolor="#000099" valign="top">
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</map>       
<!-- END GEOMAG TOP NAV BANNER -->



         







      <table summary="layout table" align="center" border="1" cellpadding="5" width="90%">
            <tbody><tr>
                <td>
                  <h2 align="center">Estimated Value of Magnetic Declination</h2>
                  <h3 align="center">To compute the magnetic declination, you must enter the location and
                  date of interest.</h3>

                  <form name="zipForm" method="post" action="/geomagmodels/struts/declZipE;jsessionid=23468DB033574691F7A14DD826FF1FA5">
                        <p>If you are unsure about your city's latitude and longitude, look it up online!
                            In the USA try entering your zip code in the box below or visit the
                            <a href="http://www.census.gov/cgi-bin/gazetteer" target="_blank">U.S. Gazetteer</a>.
                            Outside the USA try the <a href="http://www.getty.edu/research/tools/vocabulary/tgn/" target="_blank">Getty Thesaurus.</a>
                            <br>
                            <b>Search</b> for a place in the USA by Zip Code:
                            <input name="zipcode" maxlength="5" size="5" value="" type="text">





















<input value="Get Location" type="submit">
                        </p>
                  </form>
                </td>
            </tr>       
            <tr>
                <td>
                  
                  

<form name="declForm" method="post" action="/geomagmodels/struts/calcDeclination;jsessionid=23468DB033574691F7A14DD826FF1FA5">


<p><b>Enter Location:</b> (latitude 90S to 90N, longitude 180W to 180E). See <a href="http://www.ngdc.noaa.gov/geomag/magfield.shtml">Instructions</a> for details.</p>
   <table summary="layout table" align="center" border="0" width="95%">
       <tbody><tr>
         <td nowrap="nowrap"><strong>Latitude: </strong>
               <input name="minLatStr" size="10" value="" type="text">
               <input name="minLatHemisphere" value="n" checked="checked" type="radio"> N
               <input name="minLatHemisphere" value="s" type="radio"> S
         </td>
         <td nowrap="nowrap"><strong> Longitude: </strong>
               <input name="minLonStr" size="10" value="" type="text">
               <input name="minLonHemisphere" value="e" type="radio"> E
               <input name="minLonHemisphere" value="w" checked="checked" type="radio"> W
         </td>
   </tr>
   </tbody></table>


      <p><b>Enter Date (1900-2010):</b>
            Year: <input name="minYear" maxlength="4" size="4" value="2008" type="text">
            Month (1-12): <input name="minMonth" maxlength="2" size="2" value="7" type="text">
            Day (1-31): <input name="minDay" maxlength="2" size="2" value="26" type="text">
      </p>
       
<input value="Compute Declination" type="submit">
</form>

                </td>
            </tr>
            <tr>
                <td><br></td>
            </tr>
                     
          </tbody></table>
           <br>
      <center>












</center>
          <center>
</center>
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   <br></td>
</tr>
</tbody>
</table>
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何有 发表于 2008-7-26 14:53:58

<h2><img src="http://upload.wikimedia.org/wikipedia/commons/4/43/Earth_Magnetic_Field_Declination_from_1590_to_1990.gif" border="0"></h2><br>查全球磁偏角歷史：<br><h1 class="firstHeading">Magnetic declination</h1><a href="http://www.ngdc.noaa.gov/geomagmodels/USHistoric.jsp">http://www.ngdc.noaa.gov/geomagmodels/USHistoric.jsp</a><br><br><a href="http://www.ngdc.noaa.gov/geomagmodels/USHistoric.jsp"><img name="geomagnav" src="http://www.ngdc.noaa.gov/geomag/icons/geomagstrip.jpg" usemap="#geomagtopbanner" alt="Geomag top navigation banner" border="0" height="44" width="647"><table summary="layout table" align="center" border="0" cellpadding="0" cellspacing="0" width="90%"><tbody><tr align="center"></tr></tbody></table></a><table summary="layout table" align="center" border="0" cellpadding="0" cellspacing="0" width="90%"><tbody><tr align="center"><td colspan="2" bgcolor="#000099" valign="top">
        </td>
   </tr>
<!-- Geomag cookie crumb -->
   <tr>
    <td align="left" bgcolor="#ddddee" width="330">
      <div class="sidebar2">
          <a href="http://www.noaa.gov/" title="go to National Oceanic &amp; Atmospheric Administration">NOAA</a> &gt;
          <a href="http://www.nesdis.noaa.gov/" title="go to National Environmental Satellite, Data, &amp; Information Service">NESDIS</a> &gt;
          <a href="http://www.ngdc.noaa.gov/ngdc.html" title="go to National Geophysical Data Center home">NGDC</a> &gt;
          <a href="http://www.ngdc.noaa.gov/geomag/geomag.shtml" title="go to the Geomagnetic Data Home">Geomagnetism</a>
      </div>
    </td>
    <td align="right" bgcolor="#ddddee">
      <div class="sidebar2">
                <a href="http://www.ngdc.noaa.gov/feedback/cust_comments.html" title="send comments or take a survey">comments</a> |
                <a href="http://www.ngdc.noaa.gov/ngdcinfo/privacy.html" title="go to privacy, disclaimer, &amp; copyright notices">privacy        policy</a>
      </div>
      </td>
   </tr>
   </tbody>
</table>
        <map name="geomagtopbanner" id="geomagnav"><area shape="rect" coords="607,5,645,43" href="http://www.ngdc.noaa.gov/geomag/servers.shtml" target="_top" title="go to related web resources" alt="Links to related web resources"><area shape="rect" coords="486,5,552,39" href="http://www.swpc.noaa.gov/SWN/index.html" target="_top" title="go to NOAA's Space Weather" alt="go to NOAA's Space Weather prediction Center Now"><area shape="rect" coords="558,6,604,40" href="http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml" title="go to DoD World Magnetic Model WMM" alt="DoD World Magnetic Model Home"><area shape="rect" coords="414,3,481,40" href="http://www.ngdc.noaa.gov/geomag/models.shtml" target="_top" title="go to models" alt="Links and descriptions of magnetic field models and software"><area shape="rect" coords="285,4,380,40" href="http://www.ngdc.noaa.gov/geomag/geomag.shtml" target="_top" title="go to Geomagnetic Data Home" alt="go to the Geomagnetic Data Home"><area shape="rect" coords="47,11,143,40" href="http://www.ngdc.noaa.gov/geomag/declination.shtml" target="_top" title="go to declination calculator" alt="go to all data and information"><area shape="rect" coords="147,11,186,41" href="http://www.ngdc.noaa.gov/geomag/faqgeom.shtml" title="go to frequently asked questions" alt="Answers to Frequently Asked Questions"><area shape="rect" coords="199,8,242,39" href="http://spidr.ngdc.noaa.gov/spidr/" title="go to geomagnetic online databases" alt="Go to the Space Physics Interactive Data Resource"><area shape="rect" coords="-5,11,43,39" href="http://www.ngdc.noaa.gov/geomag/data.shtml" target="_top" title="go to listing of online data" alt="Geomagnetic Data online at NGDC">
       
       
       
       
       
       
       
       
       
</map><!-- END GEOMAG TOP NAV BANNER -->       





         







      <br>
      <table style="text-align: center;" align="center" border="0" width="90%">
            <tbody><tr>
                <td>
                  <p>This
programs derives a table of secular change in magnetic declination for
a specified point in the conterminous United States. It utilizes the
USD polynomial &amp; the IGRF spherical harmonic models. Declination is
shown to the nearest minute so that secular change may be properly
illustrated, but it is usually only accurate to within 30 minutes.</p>
                </td>
            </tr>
      </tbody></table>


      <br><br>
      <table style="text-align: center;" align="center" border="1" cellpadding="3" width="60%">
            <tbody><tr>
                <th>


















<script type="text/javascript">
    <!--
            function displayHelp(page,name,properties)
            {
                  newwindow = window.open(page,name,properties);
                  newwindow.focus();
            }
    -->
</script>


<script type="text/javascript">
      <!--
               var txt = "<a   href=\"javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=14#help14','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')\">Location</a>";
               document.write(txt);
      -->
</script><a href="javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=14#help14','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')">Location</a>
<noscript>
      <a href="/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=0#help14" target="_self">Location</a>
</noscript>






</th>
                <th> </th>
                <th>



















<script type="text/javascript">
      <!--
               var txt = "<a   href=\"javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=15#help15','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')\">Degree</a>";
               document.write(txt);
      -->
</script><a href="javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=15#help15','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')">Degree</a>
<noscript>
      <a href="/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=0#help15" target="_self">Degree</a>
</noscript>






</th>
                <th>



















<script type="text/javascript">
      <!--
               var txt = "<a   href=\"javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=10#help10','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')\">Minute</a>";
               document.write(txt);
      -->
</script><a href="javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=10#help10','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')">Minute</a>
<noscript>
      <a href="/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=0#help10" target="_self">Minute</a>
</noscript>






</th>
                <th> </th>
                <th>



















<script type="text/javascript">
      <!--
               var txt = "<a   href=\"javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=16#help16','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')\">Date</a>";
               document.write(txt);
      -->
</script><a href="javascript:displayHelp('/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=16#help16','USHistoricHelp','scrollbars=yes,menubar=no,height=300,width=250,resizable=yes,toolbar=no,location=no,status=no,left=425,top=200,screenX=425,screenY=200')">Date</a>
<noscript>
      <a href="/geomagmodels/USHistoricCalculatorFAQ.jsp?pagetype=0#help16" target="_self">Date</a>
</noscript>






</th>
            </tr>
            <tr>
                <td rowspan="2">            
                  <form name="zipForm" method="post" action="/geomagmodels/struts/ushdZip">
                        Zip Code: <input name="zipcode" maxlength="5" size="5" value="" type="text">






















                        <input value="Get Location" type="submit">
                  </form>
                </td>
                <form name="ushdForm" method="post" action="/geomagmodels/struts/historicPoint"></form>
                <td>
                  Northern Latitude:
                </td>
                <td>
                  <input name="minLatDegrees" size="3" value="" type="text">






















                </td>
                <td>
                  <input name="minLatMinutes" size="3" value="" type="text">






















                </td>
                <td>
                  Start Date:
                </td>
                <td>
                  <input name="minYear" maxlength="4" size="4" value="2008" type="text">






















                </td>
            </tr>
            <tr>
                <td>
                  Western Longitude:
                </td>
                <td>
                  <input name="minLonDegrees" size="3" value="" type="text">






















                </td>
                <td>
                  <input name="minLonMinutes" size="3" value="" type="text">






















                </td>
                <td>
                  End Date:
                </td>
                <td>
                  <input name="maxYear" maxlength="4" size="4" value="2008" type="text">






















                </td>

            </tr>
      </tbody></table>
            <br>
            <table align="center" border="0">
                <tbody><tr>
                  <td>
                        <input value="Compute Historical Declination" type="submit">
                  </td>
                </tr>
            </tbody></table>
   
      
      ＝────────────────────────────────────────────────────────────────────────<br><br><font size="3"><span style="color: Red;"> </span></font><a href="http://www.resurgentsoftware.com/gpetrie/GeoMag/geomag25.exe">http://www.resurgentsoftware.com/gpetrie/GeoMag/geomag25.exe</a><br><br><br><br>

天機 发表于 2015-12-18 17:55:04


最新的 NOAA 磁偏角官方計算工具: http://www.ngdc.noaa.gov/geomag-web/#igrfwmm

小老头 发表于 2020-9-25 21:18:48

宋人不会计算，也不知道磁偏角的存在吧
页: [1]
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