CMRT09: Object Extraction for 3D City Models, Road Databases and Traffic Monitoring - Concepts, Algorithms, and Evaluation 
168 
Further research will include investigations of the validity of 
Eq. 10 in real scenarios, e.g. by calculating the accuracy of 
heights based on phase differences while the phase estimate for 
the ground may have better accuracy than those of walls and 
roof. Another line of research could be the use of explicit 
models for scatterers typically appearing at buildings, instead of 
modeling their influence only implicitly by a lower coherence. 
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