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/* EVI2: Enhanced Vegetation Index
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* Zhangyan Jiang ; Alfredo R. Huete ; Youngwook Kim and Kamel Didan
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* 2-band enhanced vegetation index without a blue band and its application to AVHRR data
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* Proc. SPIE 6679, Remote Sensing and Modeling of Ecosystems for Sustainability IV, 667905 (October 09, 2007)
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* doi:10.1117/12.734933
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* http://dx.doi.org/10.1117/12.734933
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double e_vi2(double redchan, double nirchan)
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tmp = nirchan + 2.4 * redchan + 1.0;
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result = 2.5 * (nirchan - redchan) / tmp;