"The Landsat MSS products are being reprocessed as part of the SLAP project, and will be released to the users progressively during the third quarter of 2019.
There are 2 types of reprocessed MSS Level 1 Landsat product that will be available for user download:
For FAQs regarding the Landsat Missions, see the USGS pages.
MSS - Algorithm Information (applicable to IPF v3.08)
The European Space Agency (ESA) has acquired Landsat data over Europe through the ESA ground stations during the last 40 years, in co-operation with the USGS and NASA. In 2014, the product generation system of ESA has been significantly improved for supporting the Landsat MSS, TM and ETM+ archive reprocessing [ESA-S2-Symp-2014] and aligning historical Landsat data to Landsat 8 and Sentinel 2.
In terms of products and algorithms, the approach of ESA and the USGS is now similar and ESA algorithms are mostly based on the USGS ones. Developments of the ESA software include the following improvements, and are discussed in detail here;
For details of the algorithms, radiometric and geometric processing of the ESA Landsat MSS products, see the Landsat Products, Algorithms and Processing Document .
Landsat Technical Documents
Landsat MSS Links