基于HIS变换的城镇用地信息快速提取新方法

The new way of fast extraction of urban land-use information based on HIS transformation

随着中国城市化进程的加快,城镇用地在迅速地扩大,如何快速、准确与客观地提取城镇用地信息,对土地资源的保护和可持续利用具有十分重要的意义.综合运用归一化建筑指数(NDBI),归一化植被指数(NDVI)和修正型归一化水体指数(MNDWI)进行RGB彩色合成,然后对合成图进行HIS变换,利用H和S分量进行城镇用地信息提取.并利用TM7,TM5,TM1彩色合成图的I和H分量进行裸土噪声去除,最终获得城镇用地信息专题图.专题图的总体精度、Kappa系数、生产者精度和用户精度分别为:92%、0.84、88%和96%,证实该方法是快速提取城镇用地切实有效的方法.

With the acceleration of urbanization,urban land-use is increasing rapidly in China.Abstracting urban land-use information rapidly,accurately and objectively is very significant for the protection and sustainable exploitation of land resources.In this research,the normalized difference of built-up index（NDBI）,the normalized difference of vegetation index（NDVI） and the modified normalized difference of water index（MNDWI） were applied in RGB colour composition.The composed image was then transformed by HIS.The H and S factors were used to abstract the urban land use information.The I and H factors in the color composed images of TM7,TM5 and TM1 were used to remove bare soil noise.The overall accuracy,kappa coefficient,producers＇ accuracy and users＇ accuracy of the urban land-use image were 92%,0.84,88% and 96% respectively.The vesult confirms the effectiveness of this approach.