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Starting June 2, 2017, users will no longer be able to order CFMask processing for Landsat Collection 1 Higher-Level data products via the ESPA on-demand interface.
Equivalent information is now available in the “pixel_qa band”, which is included with all Higher-Level products.
For more information on the pixel_qa band, see the Product Characteristics sections of the Landsat 4-7 and Landsat 8 Surface Reflectance Product Guides.