基于NDVI和纹理变化的城镇扩展检测--以浙江省绍兴市为例

以绍兴市作为研究区，选取两景不同时相的TM影像，进行了城镇扩展的研究。该研究区位于中国东部沿海地区，其地理位置和投资环境决定了其城镇的快速发展，因此对其进行城镇扩展的研究具有非常重要的意义。本假定以植被覆盖为明显标志的景观生态和基于NDVI的城镇土地利用之间的相互关系，给出了一种新的城镇扩展检测方法，即使用NDVI公式生成植被指数，然后提取1984年和2000年归一化差分纹理指数的纹理影像，这些指数显示了这些纹理影像变化的比率，该方法成功地显示了两景影像间的变化区域。当然为了获取正确的结论往往需要相关的地面数据。研究结果显示，在城镇外围地区具有明显的植被覆盖变化。

Monitoring of Urban Growth based on Changes in NDVI and Texture: A case of Shaoxing city, Zhejiang Province

The present study illustrates a method for monitoring the urban growth of Shaoxing city, which is experiencing an obvious trend of urbanization, with the help of two different TM images acquired on different dates. The methodological approach followed was by creating vegetation index using NDVI equation and then texturing the images to create a Normalized Difference Textural Index for the years 1984 and 2000. This index represented the ratio of changes in the resultant image. The method is found to be successful in showing the areas of change between the two consecutive images. However, appropriate ground data is always necessary to reach a reliable conclusion. The results have revealed a notable change in the vegetation cover in and around the City premises. The key assumption of this study is to investigate the reciprocal relationship between landscape ecology symbolized by the presence of vegetative cover and the land use represented by urbanization in support with NDVI.