Updating land use map with high resolution satellite imagery

Land use map shows the distribution of land categories, which is fix the inventory norm with the aim of land use at the time of land inventory. In Viet Nam, the government has to build land use map and land inventory each 5 years, thus the suitable method to build land use map for inventory is updating land use map, what was built in the last period. The advantage of this process is shorter the time to built land use map, because this process edits content of land use in changed area only. Moreover it is simple, easy to apply and do not require special technology. However, this process still takes a lot of time and money to correct and investigate the content of land use outdoor, it is also affected by weather and terrain.