Annual integral changes of time serial NDVI in mining subsidence area
(1. Key Laboratory of Mine Spatial Information Technologies of State Bureau of Surveying & Mapping,
Henan Polytechnic University, Jiaozuo 454000, China;
2. School of Coal Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
Henan Polytechnic University, Jiaozuo 454000, China;
2. School of Coal Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
Abstract: By means of MORTRAN4 model of FLASSH module, an atmospheric correction of the SPOT II/IV data of four-year period for eight experimental coal faces of Lu’an mine area was done. The mining-affected zones were obtained with probability integral method. The normalized difference vegetation index (NDVI) and its mean were obtained by band ratio calculation at the mining subsidence area. Using FOURIER4 model of the fast Fourier transform (FFT) of discrete Fourier analysis theory, the mean NDVI time series data set was reconstructed. With the mean of NDVI transformed into amplitude and the phonological information transformed into phase, the law of NDVI variation by monthly, quarterly, annual were obtained. The annual integral of the time series of NDVI Fourier function (ANDVI) was obtained. The results show that an experience formula of ANDVI variation accompanies with mining time; A fast estimation formula of NPP by means of a coefficient of mining disturbance such as g:
Key words: Lu’an mine area; annual integral of NDVI; net primary productivity; coefficient of mining disturbance