  In the present paper, the characterizations of regional gradient strategic
sensors notions have been given for different cases of regional gradient
observability. The results obtained are applied to two dimensional linear
infinite distributed system in Hilbert space where the dynamic is governed by
strongly continuous semi-group. Various cases of regional strategic sensors are
considered and analyzed in connection with regional gradient strategic sensors
concepts. Also, we show that there is a various sensors which are not gradient
strategic in usual sense for the considered systems, but may be regionally
gradient strategic of this system.
