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terraref/extractors-hyperspectral: Nov 2017 Beta Release

JeromeMao; Max Burnette; hmb1; Charlie Zender; David LeBauer

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    <subfield code="a">&lt;p&gt;This is the first release of the hyperspectral pipeline. See the repository README for more details. It represents a major improvement relative to the Nov 2016 release.&lt;/p&gt;
&lt;p&gt;The hyperspectral calibration procedure is documented at &lt;a href=""&gt;;/a&gt;.&lt;/p&gt;
&lt;li&gt;Only valid for 300-800nm (range of downwelling radiometer)&lt;/li&gt;
&lt;li&gt;Raw hyperspectral exposures are calibrated for images in full sunlight. Other times and cloudy days are not well-tested yet. &lt;/li&gt;
&lt;li&gt;Zenith angles used in the calibration data are: 42.3, 47.6, 53.0, 58.4, 64.0, 75.1, 80.7, 86.5&lt;ul&gt;
&lt;li&gt;The closer the raw data is to these angles the better the result  &lt;/li&gt;
&lt;li&gt;The calibration needs improvement to obtain accurate absolute reflectances. Environmental conditions (such as shade and specular reflection) and irregular calibration of known targets (such as tilted surfaces and field-based calibration) can bias retrieved reflectances by an unknown factor. However, the scale bias factors out of indices created as ratios of reflectances, e.g., (A-B) / (A+B).&lt;/li&gt;
Related GitHub issues and documentation
&lt;li&gt;&lt;a href=""&gt;Notes from meeting on calibration options&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;First (alpha) calibration proceedure &lt;a href=""&gt;;/a&gt;&lt;/li&gt;
&lt;li&gt;Second (radiometer based) calibration &lt;ul&gt;
&lt;li&gt;List of tasks &lt;a href=""&gt;;/a&gt; &lt;/li&gt;
&lt;li&gt;Algorithm documentation &lt;a href=""&gt;;/a&gt;&lt;/li&gt;
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