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We review the main factors driving the calculation of the tangent height of spaceborne limb  measurements: the ray-tracing method, the refractive index model and the assumed atmosphere. We  find that commonly used ray tracing and refraction models are very accurate, at least in the  mid-infrared. The factor with largest effect in the tangent height calculation is the assumed  atmosphere. Using a climatological model in place of the real atmosphere may cause tangent height  errors up to ± 200 m. Depending on the adopted retrieval scheme, these errors may have  a significant impact on the derived profiles

Characterization of model errors in the calculation of tangent heights for atmospheric infrared limb measurements