Abstract: After China has completed the database of general survey of geographical conditions, the focus of work has changed from general survey to monitoring. No matter in general survey or monitoring, it is always the key and difficulty to classify the surface cover accurately. In the stage of normalization monitoring, it is very important for production organization and quality control to master the main quality indicators of surface coverage classification results, summarize their change rate, change area distribution, types of changes and analyze the main factors affecting the quality.

Key words: geography national condition monitoring, surface coverage classification data, error rate, rate of change, the quality characteristics