The Bureau has established base values for debris-flow warnings based on geological characteristics of locations. Every year, drawing on new data, these values are updated. Related models for collecting information from other countries as well as updated observation information are also considered when setting these values, as a means of improving the effectiveness of debris-flow warnings. Fixed monitoring stations in areas of debris-flow risk are established, and with the aid of fixed, mobile and temporary monitoring stations, the Bureau is able to collect information from debris-flow affected areas as disasters occur. This is extremely valuable in improving the accuracy of the debris-flow warning system’s base values. With the improvement in resolution of satellite photography, the Bureau also conducts an assessment of debris-flow areas using satellite images as a way of incorporating information from inaccessible areas. UAVs are also used to photograph the site in the first instance following the disaster, as they are less affected by cloud levels and weather conditions. All of these methods greatly assist in the overall assessment and analysis of a disaster situation.