Currently, some of the highest resolution civilian imaging satellites can achieve a spatial resolution of around 30 cm. Military satellites, on the other hand, may have higher resolution capabilities, but their specifications are often classified and not publicly available.

There is no fundamental limit to satellite imagery resolution, including interferometry. The resolution of a satellite image is determined by a number of factors, including the size of the sensor, the distance from the target, and the atmospheric conditions. Advances in technology and improvements in sensor and processing capabilities are continually pushing the limits of resolution higher. However, there are practical limits, such as cost and the need to maintain a sufficient altitude for the satellite to cover a large enough area to be useful, that limit the resolution that can be achieved in practice.
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