Large scale monitoring systems require reliable and efficient routing protocols used to overcome the limitations introduced by battery operated embedded devices, among which, energy consumption is considered the main concern. This topic has gained a lot of interest in the last decade. Due to numerous advantages, clustering is becoming more prevalent as a routing technology in WSN. This paper describes and evaluates a WSN clustering algorithm, with apriori elected cluster heads (CHs), entitled Aerial Supported Clustering Scheme (ASCS). Leveraging CONTIKI Cooja simulation environment, the proposed clustering mechanism is evaluated on several WSN static topologies. Stemming data, such as power consumption and number of iterations are analysed from a comparative standpoint.