Working with Landsat 8, a tutorial. 2. creating simple composites

Nice tutorial for dealing with Landsat 8 imagery using scripting

Scientia Plus Conscientia

In this second post of the Landsat 8 series, we have a look at how to create simple color composites with uncorrected data, a common and useful task that is often misunderstood by beginners. For this purpose, it is necessary to understand two concepts: how digital sensors register information and how color images are constructed.

The first key concept is that sensors on board satellites or air planes perform radiometric measurements in specific ranges of wavelength of the electromagnetic spectrum. Sensor elements capture a portion of the outgoing (from Earth) radiation in a given spectral window, which is then converted to digital numbers, stored and, together with the set of neighboring measurements, coded as regular image grids. Images acquired in specific windows of the spectrum are called ‘bands’. The spectral ranges in which they were acquired, measured in nanometers or micrometers, together with their nominal pixel size, are key properties…

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About Qiusheng Wu

Assistant Professor of Geography at Binghamton University, State University of New York

Posted on November 18, 2014, in Uncategorized. Bookmark the permalink. Leave a comment.

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