STFLNDVI: A long-term 1km NDVI time series since 1982 by fusing MODIS and AVHRR products

A global long-term NDVI dataset is generated since 1982 through fusing MODIS and AVHRR products, with a spatial resolution of 1km and monthly intervals. This dataset can be regarded as a backward extension of the 1km MODIS observations with consistent data characteristics. It is provided using the standardized MODIS sinusoidal grid with the same geographic projection, with the data format of TIFF images. Users can search the interest regions using the MODIS tile number, i.e., ‘h*v*’. The time-series NDVI from 1982 to 1999 are provided in one compressing ZIP file, with the maximum size of about 600M memory after uncompressing into the TIFF format (*.tif). The compressing TAR.GZ files are named using the MODIS tile number, i.e., ‘h*.tar.gz’, which contains several 'h*v*.tar.gz'. After uncompressing into the TIFF format, the files are named as “Fusion.MOD.Tile Number. Year Month.tif”. Such as the file name “Fusion.MOD.h07v03.198201.tif” means it is the 1km NDVI for regions of the MODIS h07v03 grids in January of 1982. The spatial distribution and temporal variation of this dataset have been both well validated by the simulated and real-data experiments. The detailed information can be found in the published paper. Due to the quota limitation, some data are not successfully uploaded, including the data with tile numbers of h22v02, h23v02, h24v02 and h25v02, and all the data with the vertical tile number of v00 and v01. This data can be accessed by emailing us at [e-mail].本数据集为1982年至今的全球长期归一化植被指数（Normalized Difference Vegetation Index, NDVI）数据集，通过融合中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer, MODIS）与高级甚高分辨率辐射计（Advanced Very High Resolution Radiometer, AVHRR）产品生成，空间分辨率为1km，时间分辨率为月度。 该数据集可视为1km分辨率MODIS观测数据的向后延拓序列，具备一致的数据特性。其采用标准化MODIS正弦网格（MODIS sinusoidal grid）进行存储，地理投影与MODIS数据完全一致，数据格式为标签图像文件格式（Tagged Image File Format, TIFF）图像文件。 用户可通过MODIS瓦片编号（格式为"h*v*"）检索目标区域。1982年至1999年的时序NDVI数据打包为单个压缩ZIP文件，解压为TIFF格式后最大占用存储空间约600MB。 压缩TAR.GZ文件以MODIS瓦片编号命名，格式为"h*.tar.gz"，每个压缩包内含若干"h*v*.tar.gz"文件。解压为TIFF格式后，文件命名规则为"Fusion.MOD.瓦片编号.年份月份.tif"。例如文件名"Fusion.MOD.h07v03.198201.tif"，即代表1982年1月MODIS h07v03网格区域的1km分辨率NDVI数据。 本数据集的空间分布与时序变化特性已通过模拟实验与实测数据实验完成充分验证，详细验证信息可参见已发表的学术论文。 受配额限制，部分数据未能成功上传，包括瓦片编号为h22v02、h23v02、h24v02、h25v02的数据，以及所有垂直瓦片编号为v00、v01的数据。此类缺失数据可通过发送邮件至[e-mail]获取。