FENG Wenlan,ZHENG Jie.Analysis on Vegetation Change in Zoige Region by the Scale Transformation Method Based on MODIS and NOAA DATA[J].Research of Soil and Water Conservation,2016,23(03):297-303.
基于MODIS和NOAA数据尺度转换的若尔盖植被变化研究
- Title:
- Analysis on Vegetation Change in Zoige Region by the Scale Transformation Method Based on MODIS and NOAA DATA
- 关键词:
- GIMMS NDVI; MODIS NDVI; 重采样; 一元线性回归; 若尔盖
- 分类号:
- S127
- 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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备注/Memo
收稿日期:2015-03-05;改回日期:2015-07-09。
基金项目:国家自然科学资助项目“气候变化和人类活动对岷江上游生态脆弱性相对作用的研究”（41301653）
作者简介:冯文兰(1979-),女,四川成都人,博士,教授,主要从事资源环境遥感研究。E-mail:fwl@cuit.edu.cn