For all images in each year group, cloud masks are applied to set obscured pixels to the background NA value and then the year composite is calculated from the per-cell mean value of overlapping images. The Landsat Program has provided over 40 years of calibrated high spatial resolution data of the Earth's surface to a broad and varied user community. Although the map projection coordinate system is only an approximation of a true local Cartesian coordinate system at the Earths surface, the mathematical relationship between the map projection and geodetic coordinate systems is defined precisely and unambiguously. After viewing the recorded pass is complete, the most recent feed is again displayed. Flag for inappropriate content.
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