1. Introduction
2. Related Work
2.1. Development of Online Mapping Technologies and WMS
2.2. Online Geospatial Web Service Survey
2.3. Quality of Service Monitoring
3. Data Collection and Methodology
3.1. Online Web Map Service Discovery
3.2. Distributed Monitoring Framework and Strategy
3.3. Survey Data Collection
4. Data Analysis
4.1. Global WMS Resource Survey
4.2. Stability and Performance Analysis
5. Conclusions and Future Work
5.1. Conclusions
5.2. Suggestion and Future Work