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This communication presents a corrected formulation, differing significantly from a traditional and widely- employed one, for the precision of topographic measurements by means of space-based or airborne radar interferometry. The reasons for this difference are suggested. The discrepancies are especially wide at near-nadir viewing. The corrected formulation is consistent with a simple physical model and is confirmed by numerical differencing using a spreadsheet analysis.
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Isaac Weissman (2022) studied this question.