The data set is a long time series vegetation index data set of Shule River. It is mainly aimed at the normalized vegetation index (NDVI), including the spectral reflectance of four bands synthesized every 10 days from 1998 to 2008 and the maximum NDVI of 10 days. The spatial resolution is 1km and the temporal resolution is 10 days.
File format: one. HFR file and one. Img file. The file naming rule is: CHN_ NDV_ Yyyymmdd, in which yyyymmdd is the date of the day represented by the file, and it is also the main identification different from other files. Remote sensing image files with suffixes of. Img and. HDF can be opened in ENVI and ERDAS software.
The vegetation sensor, sponsored by the European Commission, was launched by SPOT-4 in March 1998. It has received spotvgt data for global vegetation coverage observation since April 1998. The data is received by Kiruna ground station in Sweden, and the image quality monitoring center in Toulouse in France is responsible for image quality and provides relevant parameters (such as calibration system Finally, the vegetation processing center (ctiv) of Flemish Institute for technological research (Vito) in Belgium is responsible for preprocessing the data into 1km global data day by day.
Preprocessing includes atmospheric correction, radiometric correction, geometric correction, production of 10 days maximum synthesis of NDVI data, and set the value from - 1 to - 0.1 to - 0.1, and then convert it to the DN value of 0-250 through the formula DN = (NDVI + 0.1) / 0.004.
Data set quality control through strict manual audit
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CSTR:11738.11.ncdc.Westdc.2020.326
10.12072/ncdc.westdc.db3678.2023