Hi Ian, I asked the SARscape developers this question, and this is the reply they sent: "SARscape is not really exploiting the baseline concept duringcomputations, but only (from the corresponding estimation tool) to get somegeneral information about a certain pair. And the baseline in that case is estimated from the full state vectorscontained in the metadata and using rigorous forward / backward geocoding (notfrom annotated baselines or whatever else). The phase2heigh conversion (as geocoding or any other geometriccalibration step in SARscaoe in general) is then based again on rigorousRange-Doppler equations solution, exploiting full orbital information (statevectors), as also TDX helical orbit should be fully annotated in the metadata. Here two references, one about why we do not use baseline Small, D.; Pasquali, P.; Fuglistaler, S., "A comparison of phase toheight conversion methods for SAR interferometry," Geoscience andRemote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a SustainableFuture.', International , vol.1, no., pp.342,344 vol.1, 27-31 May 1996 And the other about the solution we use (the full one, as numericsolution) Goblirsch, W.; Pasquali, P., "Algorithms for calculation of digitalsurface models from the unwrapped interferometric phase," Geoscienceand Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for aSustainable Future.', International , vol.1, no., pp.656,658 vol.1, 27-31May 1996 " I hope this helps. I also thought I should mention that for these types of technical questions about SARscape, you may want to contact Exelis VIS Tech Support directly. We try to keep an eye on the forum, but we can't promise to get to everything posted here. The forum is mainly intended for other SARscape users to talk to each other. Even when we do respond here, we usually get to direct tech support incidents faster than forum posts. Regards, Peg Shippert Exelis VIS