So, the water vapour concentrations associated with a given satellite reading also need to be estimated, and accounted for. (globalwarmingsolved.com)
Please see this entry to correct your outdated concerns about satellite readings, they are well in line with the models now after numerous error corrections. (illconsidered.blogspot.ru)
From what I have read there seems to be an unresolved discrepancy between satellite readings and tide gauge readings which seems to be borne out by the difference in these rates. (skepticalscience.com)