Multibaseline methods have been recently proposed to reduce problems of pha
se ambiguity arid data noise in SAR interferometry for topographic mapping,
Both phase-only interferometry and direct processing oi the complex multib
aseline data have been considered. In this paper, two non-model based multi
baseline estimators and two recently proposed model based algorithms are di
scussed and compared in terms of statistical accuracy of the reduced-ambigu
ity phase estimate. it is shown that rnodel-based processing of the complex
multibaseline data can be significantly more efficient than the other meth
ods.