The minimum spatial resolution in which features related to the phenomenon under investigation become apparent against the background and allow to detect information about the phenomenon. Jensen: Spatial resolution is a measure of the smallest angular or linear separation between two objects that can be resolved by the remote sensing system. [...] A useful heuristic rule of thumb is that in order to detect a feature, the nominal spatial resolution of the sensor should be less than one-half the size of the feature measured in its smallest dimension.
Discuss the minimum resolution required for detecting single houses in a satellite image
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