Anyone know how the Landsat NDVI composite image collections on Google Earth Engine are developed? I'm wondering if GEE masks clouds and cloud shadows? If they are performing a reducer on all NDVI images, what reducer are they using? Average or median, perhaps? I can't find any documentation in the Chandler et al. (2009) paper that GEE references nor anywhere else so I'm guessing there's no cloud masking. If that's the case, what use is this image collection since most NDVI analysis seems to require cloud and shadow masking and there's no quality/cloud bands in these composites to cloud mask with.
I like these composites because they are already preprocessed to monthly and annual values and much easier to work with.