Hi Fikretjfm,
The velocity map you get is only a relative value, the zero values on the map don’t mean they don’t subsidence in reality, they are just the reference points. For example, if the subsidence velocity of the zero value points on the map is 20mm/yr in reality, then the real subsidence velocity of the points which value are -5mm/yr on the map is 15mm/yr, and the positive values on the map are calculated the same way.
All the best,
Fei
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