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from above article, I quote for you :

Digital Number, Radiance, and Reflectance Author: Peg Shippert / Friday, August 23, 2013 http://www.exelisvis.com/Home/NewsUpdates/TabId/170/ArtMID/735/ArticleID/13592/Digital-Number-Radiance-and-Reflectance.aspx

I know some of you here using webgis with PHP a lot, so here we go, I just found nice ebook apps on google play really handy for webgis with php development Description : This app offers an always up-to-date official PHP documentation. The manual contains more than 13.000 files and comes with user notes. Features: - latest manual release version - offline (no connexion needed) - code examples - user notes see here : https://play.google.com/store/apps/details?id=awamestudio.phpmanual&hl=en happy coding