Thresholding on aggregation based on number of valid pixels per grid cell
Another request from Andy Sayer:
is there any ability to implement thresholding? If not, is this something which is easy to add?
For example, in the MODIS level 3 aerosol products, at least 3 (I think) retrievals are needed for a daily 1 degree grid cell to be considered valid, and at least 3 days are needed for a monthly grid cell to be considered valid.