A method of localizing a plurality of wireless transmitters (104a-140f), the method comprising: establishing, by a localization device , a communication with one or more sensors distributed in a grid pattern in an indoor space ; retrieving, by the localization device , Received Signal Strength Indicator values measured by the one or more sensors , along with location information of each of the one or more sensors , corresponding to the plurality of wireless transmitters (104a-104f) in the indoor space ; generating, by the localization device , a plurality of clusters (302-308) based on the retrieved Received Signal Strength Indicator values and the location information of each of the one or more sensors ; generating, by the localization device , a binary image based on the generated clusters (302-308), wherein the binary image comprises one or more white regions (310-320), with contours (324-334) indicating a boundary in which a maximum range of transmission of each of the plurality of wireless transmitters (104a-104f) is present in a region of the indoor space and one or more black regions; localizing, by the localization device , the position and proximity of the plurality of wireless transmitters (104a-104f) corresponding to each other, based on the contours (324-334) of the one or more white regions (310-320) present in the binary image; and communicating, by the localization device , information associated with the position and proximity of each of the plurality of wireless transmitters (104a-104f) to a network planning system, so as to automate reuse of frequencies used for transmissions by each of the plurality of wireless transmitters (104a-104f). establishing, by a localization device , a communication with one or more sensors distributed in a grid pattern in an indoor space ; retrieving, by the localization device , Received Signal Strength Indicator values measured by the one or more sensors , along with location information of each of the one or more sensors , corresponding to the plurality of wireless transmitters (104a-104f) in the indoor space ; generating, by the localization device , a plurality of clusters (302-308) based on the retrieved Received Signal Strength Indicator values and the location information of each of the one or more sensors ; generating, by the localization device , a binary image based on the generated clusters (302-308), wherein the binary image comprises one or more white regions (310-320), with contours (324-334) indicating a boundary in which a maximum range of transmission of each of the plurality of wireless transmitters (104a-104f) is present in a region of the indoor space and one or more black regions; localizing, by the localization device , the position and proximity of the plurality of wireless transmitters (104a-104f) corresponding to each other, based on the contours (324-334) of the one or more white regions (310-320) present in the binary image; and communicating, by the localization device , information associated with the position and proximity of each of the plurality of wireless transmitters (104a-104f) to a network planning system, so as to automate reuse of frequencies used for transmissions by each of the plurality of wireless transmitters (104a-104f). <EOS>