I updated the guidelines on power lines at the WikiProject Power Systems/Philippines page. There are additional guidelines, like mapping transmission lines, characterized by tubular towers and usually made of wood, concrete, or metal and owned by Meralco and provincial electric cooperatives/companies, and mapping minor power lines and utility poles, including those having transformers. Yet, with some areas lacking quality imagery for tracing, a survey and local knowledge about tubular power tower and utility pole locations may be used to map them. Also, mapping transmission lines on rural areas may be difficult to map because of lack of imagery or low quality imagery.
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