These data surfaces were generated using data from the 6 miscellaneous FAO land units: DS (dunes or shifting sands), ND (no data), RK (rock debris or desert detritus), ST (salt flats), WR (inland ...
[Source: NASA/GISS, http://data.giss.nasa.gov/ch4_fung/ ]
Surface Exchange of Methane (Fung et al. 1991)
This page offers access to a number of datasets which describe the exchange of methane between ...