Although the USGS imagery superficially resembles an RGB picture, it is (in my opinion) inappropriate to call it natural-color. The USGS also distributes imagery they call “natural color,” using shortwave infrared, near infrared, and green light. False-color images, which incorporate wavelengths of light invisible to humans, can reveal fascinating information-but they’re often misleading to people without formal training in remote sensing. I prefer using the red, green, and blue bands because natural-color imagery takes advantage of what we already know about the natural world: trees are green, snow and clouds are white, water is (sorta) blue, etc. (The complete scene data can be downloaded using Earth Explorer.) Īfter you’ve extracted the files, you’ll have a somewhat cryptically-named directory with the three band files in it (B2, B3, B4):
#Photoshop 2013 archive
OS X can automatically uncompress the files (with default settings) when the archive is downloaded-double-click to unpack the TAR.) Inexplicably, the TIFFs aren’t compressed. (Windows does not natively support TAR, so you may need to use something like 7-Zip to unpack the files. These arrive in a ZIPped and TARred archive. The data are comprised of 11 separate image files, along with a quality assurance file (BQA) and a text file with metadata (date and time, corner points-that sort of thing).
#Photoshop 2013 zip
Either use this sample data (184 MB ZIP archive) of the Oregon Cascades, or dip into the Landsat archive with my tutorial for Earth Explorer. The first step, of course, is to download some data. Believe it or not, this doesn’t require any tools more specialized than Photoshop (or any other image editing program that supports 16-bit TIFF images, along with curve and level adjustments). True-color Landsat 8 image collected August 13, 2013.Īlthough it’s possible to process all that data automatically, it’s best to process each scene individually to bring out the detail in a specific region. An area about 40% larger than the united states. Since its launch in February 2013, Landsat 8 has collected about 400 scenes of the Earth’s surface per day.
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