TY  - Data
T1  - Long term vegetation index dataset of China――SPOT VEGETATION NDVI 
A1  - Greet JANSSENS
A1  - Ma mingguo
DO  - 10.12072/ncdc.westdc.db3895.2023
PY  - 2020
DA  - 2020-04-08
PB  - National Cryosphere Desert Data Center
AB  - The vegetation sensor, sponsored by the European Commission, was launched by SPOT-4 in March 1998, and received the spotvgt data for global vegetation coverage observation from April 1998. The data was received by Kiruna ground station in Sweden, and the image quality monitoring center in Toulouse, France, was responsible for image quality and provided relevant parameters (such as calibration coefficient). Finally, Billy At that time, the vegetation processing center (ctiv) of Flemish Institute for technical research (Vito) is responsible for preprocessing the data into 1km global data day by day. Preprocessing includes atmospheric correction, radiation correction, geometric correction, and 10 day production to maximize the synthesized NDVI data, and set the value of - 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. The dataset is a subset of China, which contains the spectral reflectance of four bands synthesized every 10 days and the 10 day maximum NDVI. It is the data of 1998-2007, with a spatial resolution of 1km and a temporal resolution of ten days. File format:. HFR and. Img files. The file naming rule is: CHN ﹣ NDV ﹣ yyyymmdd, where yyyymmdd is the date of the day that the file represents, and is also the main identification different from other files. Remote sensing image files with suffixes of. Img and. HDF used by users to analyze vegetation index can be opened in ENVI and ERDAS software. Coordinate system and projectionPlate_Carree (Lon/Lat)PROJ_CENTER_LON 0.000000PROJ_CENTER_LAT 0.000000PIXEL_SIZE_UNITS DEGREES/PIXELPIXEL_SIZE_X 0.0089285714PIXEL_SIZE_Y 0.0089285714SEMI_AXIS_MAJ 6378137.000000SEMI_AXIS_MIN 6356752.314000UL_LON (DEG) 73.000000UL_LAT (DEG) 54.000000LR_LON (DEG) 135.500000LR_LAT (DEG) 5.000000The coordinates of corner points are as follows:Corner Coordinates:Upper Left ( 69.9955357, 55.0044643)Lower Left ( 69.9955357, 14.9955358)Upper Right ( 137.0044641, 55.0044643)Lower Rig
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/da25cd50-b7bf-4c1a-a7a8-83df62d0f294
ER  -