Efficiency evaluation model of web-based emergency mapping

existing web map systems have integrated multi-scale geographical information and supplied friendly visualization interfaces. Furthermore, volunteered geographical information, which is captured and released on web map framework, is an essential source for emergency surveying and mapping supports. However, the emergency mapping service on web map has more uncertainty. This paper proposes an Optimal Ternary Model for Efficiency (OTME) for measuring the consumption time of emergency web mapping. Three key factors are discussed and regression analysis is applied to specify the quantitative relationship between each factor and mapping efficiency. Map World (Tianditu) is tested as a sample to evaluate the efficiency of web emergency mapping.