基于MODIS和NOAA数据尺度转换的若尔盖植被变化研究

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 23 期数: 2016年03期页码: 297-303 栏目: 出版日期: 2016-06-28

Title:: Analysis on Vegetation Change in Zoige Region by the Scale Transformation Method Based on MODIS and NOAA DATA

Author(s):: FENG Wenlan, ZHENG Jie; College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China

摘要:: 为获得若尔盖地区较长时间序列的遥感植被指数，采用重采样技术和一元线性回归方法实现了GIMMS NDVI和MODIS NDVI的空间尺度转换和时间尺度外推。结果表明：（1）不同重采样方法对MODIS NDVI数据的影响与空间尺度有关，对GIMMS NDVI数据的影响则与空间尺度关系不大；（2）空间分辨率2.5 km，对不同植被类型可建立GIMMS NDVI和MODIS NDVI数据的一元线性转换关系，利用GIMMS NDVI拟合的结果与MODIS数据的差值统计符合正态分布；（3）1982—2013年，以1998年为节点若尔盖地区的植被先退化后逐渐恢复，尽管近几年植被指数平均水平高于研究初期，但局部地区的植被退化形势仍然比较严峻。

Abstract:: In order to obtain a longer time series vegetation index in Zoige Plateau Wetland, spatial conversion and time extrapolation of GIMMS NDVI and MODIS NDVI were obtained by the method of image resampling and unitary linearity regression. The results showed that: (1) spatial scale was related to the influence of resampling methods for MODIS NDVI data, while it was hardly related to the GIMMS NDVI resampling data; (2) at 2.5 km per pixel resolution, the regression equation of different vegetation types between the two kinds of data was set up, the difference between the fitting results by GIMMS NDVI and MODIS NDVI conformed to normal distribution; (3) from 1982 to 2013, the vegetation in the study area degraded before gradual recovery, and the year of 1998 was the turning point, although the average level of vegetation index was higher than that in the early 1980s, local vegetation degradation situation was still serious.

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更新日期/Last Update: 1900-01-01