Hi,
Thanks again for the reply.
What I am looking to do is to generate a time averaged composite of CH4 (in a L3 grid) and provide an uncertainty value for each pixel within this (I have read when you are performing time averaging then the uncertainty should be doubled - “Uncertainties for the XCH4 is only based on the single sounding precision due to measurement noise. For applications requiring an overall uncertainty estimate, we propose to multiply the provided error by a factor 2, which reflects the scatter of single sounding errors in the TCCON validation”)
For example - for a major CH4 emitter (say a powerplant etc) I would like to be able to provide an uncertainty value for the pixel in the L3 grid, over a single observation and also over a time average (e.g. average the uncertainties).
Forgive my naivety, but if I am to generate the L3 uncertainty values myself (as HARP currently cannot) is this simply the case of gridding the L2 uncertainty values to the same spatial grid as the L3 CH4 (performed in HARP) or is there something more complex that needs to be done to correctly process this?
thanks again for your time,
Ty