利用城市夜间灯光资料和NDVI研究成都地区植被覆盖度变化
Vegetation Coverage Changes in Chengdu Based on DMSP/OLS and SPOT-VEG NDVI
中文摘要：
利用SPOT VEG NDVI植被覆盖度数据和DMSP/OLS夜间灯光数据对成都地区近16年来城市化进程对植被覆盖度的影响进行了研究。结果表明：成都地区城市化进程呈增长的趋势，但各地区发展程度差异较大。1998—2013年成都地区植被整体覆盖度较好，且植被覆盖度与夜间灯光亮度值呈显著负相关，相关系数达－0.78以上。城市活动越强烈的地方植被覆盖度越小，即城市中心植被覆盖度最低，距离城市中心越远植被覆盖度较高，城市化发展迅速的城市周边植被覆盖度变化最大。总体而言，成都地区植被覆盖程度处于增加趋势或保持相对稳定。
中文关键词：
城市化进程，NDVI，植被覆盖度，夜间灯光数据
KeyWords：
urbanization process, NDVI, vegetation coverage, night light data
Abstract：
The effect of urbanization process on vegetation coverage was analyzed by using SPOT VEG NDVI and DMSP/OLS data in the Chengdu region from 1998 to 2013. The results show that: the urbanization in Chengdu experienced a continuing and
rapid process, but the degree of development of each region has a big difference. From 1998 to 2013, the overall coverage of vegetation in Chengdu was good, and the vegetation coverage and the night lights brightness values were significantly negative correlated, the correlation coefficient is above 0.78.The more intense urban activities, the smaller the vegetation coverage is, that is, in the center of the city, the vegetation coverage has the smallest value, the farther the distance from the city center, the higher the vegetation coverage is. The change of the vegetation around the city where urbanization is developed fast is the largest. As a whole, the degree of vegetation coverage in the Chengdu region remains relatively stable and increase smoothly.
rapid process, but the degree of development of each region has a big difference. From 1998 to 2013, the overall coverage of vegetation in Chengdu was good, and the vegetation coverage and the night lights brightness values were significantly negative correlated, the correlation coefficient is above 0.78.The more intense urban activities, the smaller the vegetation coverage is, that is, in the center of the city, the vegetation coverage has the smallest value, the farther the distance from the city center, the higher the vegetation coverage is. The change of the vegetation around the city where urbanization is developed fast is the largest. As a whole, the degree of vegetation coverage in the Chengdu region remains relatively stable and increase smoothly.