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What is the code for this? Already mosaic'ed my image

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put on hold as too broad by jbchurchill, Fran Raga, MrXsquared, Vince, csk Jun 12 at 20:15

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GEE doesn't have a specific algorithm to atmospherically correct scenes, just Cloud Score in Landsat case. Instead to trying to correct images, use Surface Reflectance products:

USGS Landsat 8 Surface Reflectance Tier 1

This dataset is the atmospherically corrected surface reflectance from the Landsat 8 OLI/TIRS sensors. These images contain 5 visible and near-infrared (VNIR) bands and 2 short-wave infrared (SWIR) bands processed to orthorectified surface reflectance, and two thermal infrared (TIR) bands processed to orthorectified brightness temperature

These data have been atmospherically corrected using LaSRC and includes a cloud, shadow, water and snow mask produced using CFMASK, as well as a per-pixel saturation mask.

Strips of collected data are packaged into overlapping "scenes" covering approximately 170km x 183km using a standardized reference grid.

Usage:

var imageCollection = ee.ImageCollection("LANDSAT/LC08/C01/T2_SR");

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