The monitoring of high-voltage transmission lines right-of-ways, regarding the cleaning and clearing of vegetation is done periodically by visual survey, video surveillance, or by air-borne LiDAR (Light Detection And Ranging) scanners. Geographical Information Systems (GIS) containing the geo-referenced data of lands, assets from where the transmission lines passes, vegetation near the line and the applications utilized are essential tools for the improvement of transmission lines maintenance. This paper proposes a concept of multispectral satellite stereo images to find out the 3D depth of vegetation endangering transmission lines right-of-ways, and also a new Multimedia Wireless Sensor Networks (MWSNs) based cost effective, less time consuming and a more accurate technique for the automated power line inspection against vegetation encroachment. © 2011 IEEE.