Analysis: The data herein is pretreated and calculated 30 years (1983-2012 years) phenological parameters of sensing the beginning of the data, a total of 30 images, now require pixel by calculating the entire phenological beginning of the spatial distribution (average) and trends analysis (Slope linear regression analysis). The final results (plotted as distribution, trends right picture):
First, the principle of the method
1, the spatial distribution of
Using ArcGIS Raster Calculator, you can calculate the mean.
2, trend analysis
A linear regression model can simulate the change of the parameter during the growing season in each cell space, the slope of the least squares method to calculate the following formula:
Wherein n is the cumulative number of years, as described herein