Development of time-varying global gridded &amp;lt;i&amp;gt;T&amp;lt;/i&amp;gt;&amp;lt;sub&amp;gt;s&amp;lt;/sub&amp;gt;–&amp;lt;i&amp;gt;T&amp;lt;/i&amp;gt;&amp;lt;sub&amp;gt;m&amp;lt;/sub&amp;gt; model for precise GPS–PWV retrieval
Atmospheric measurement techniques