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The US National Park Service (NPS) assesses the night sky quality over parksby capturing a series of overlapping images to obtain a mosaic view of theentire night sky. The NPS Night Skies Program has integrated a sequence ofscripts and software packages (a "pipeline") to process and create thehemispherical mosaic images. This processing pipeline is being improved toreduce dependence on commercial software packages, improve management ofrevisions, and ease distribution of the latest version. The upgraded pipelineis designed for processing the images in three stages: (I) performing datareduction, calibration, and mosaic, (II) modeling the natural sky brightness toseparate out light from artificial sources, and (III) deriving sky qualityindicators. Currently, stage I is completed and is presented in detail in thisreport. Stage II and III are in the upgrading process and will be presented ina future report. In stage I, the pipeline applies basic image reduction,pointing registration, photometric calibration, coordinate transformation, andimage mosaicking. We implemented new features including auto-logging theprocessing history, version control through Git and GitHub, team management onsource code development, reduction on the number of required proprietarysoftware usage, and setting the primary pipeline language to Python. Once theupgrade is completed, our open source pipeline can benefit other scientists inthe similar research field worldwide for processing related sets of data.

Upgrading the processing pipeline for the National Park Service Night Skies Program