Previous Landsat Updates have provided details about processing system updates and changes to data products, which are planned to be implemented in late November 2015.
After extensive analysis and consultation with Landsat data users, it has been determined that many of the planned changes will not be implemented at this time. This will allow for further testing, data quality analysis, and user access to samples of the revised products in advance of the operational implementation. Since these changes will affect the use of the data, delaying these changes further allows the USGS to ensure that we continue to produce and distribute high quality data products. The consolidation of these changes into a more mature product will reduce the need for future incremental changes.
These changes will also provide the groundwork for a new Collection Management scheme for Landsat product generation. Employing a collections approach will create a stable archive in which 1) the absolute radiometry is well characterized and quantified and that data are intercalibrated across Landsat sensors; 2) the georegistration of the Landsat scenes is consistent; and 3) the product format is stable. More information on the USGS Collection Management plans will be provided in a future Landsat Update and on the Landsat Missions Web site.
The summaries below provide details of what is included in the Level-1 Product Generation Systems (LPGS) releases in November 2015, and those items planned for future releases.
Items Not Included
In order to correct the stray light, a mitigation algorithm has been created and tested –with the acknowledgement that this correction would not completely eliminate errors, but it may reduce them.
Further testing has shown that the algorithm is not producing the expected improvements. This algorithm has been removed from this release. Analysis continues and Stray Light corrections may be implemented in the future.
Please Contact Us with your questions or comments regarding these plans.