I am working on a project that is looking to use a time-series of S5P data to identify CH4 trends/ sources etc. I have never used S5P data before so please excuse any obvious mistakes I make. I initially tried to use arcGIS to convert from L2 to a L3 gridded product although this did not work. I have since found the HARP library and I have followed the RUS training webinar (pollution monitoring with Sentinel-5p) to understand how to process to L3 data.
The project requires two data quality filters to be applied to the CH4: a qa_value filter (to be set at 0.5 initially and then adjust to either increase or decrease if needed) and a degree of freedom filter of methane to only include >1 : (PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/degrees_of_freedom_methane) to only include values >1.
I have checked the entire forum but nobody seems to mention the degree of freedom filter. I have also checked the ingestions page and this does not seem to mention a variable.
Is there a way in which this can be done using HARP? If not i would appreciate any advice/ example on how I could do this?