This study aimed to determine the optimal observation time and to reduce the canopy structural effect for LCC estimation over row-structured crops. However, the effects of solar angle or spectral observation time and canopy structure on LCC estimation for row crops have been poorly understood. Since the canopy reflectance signature of crops is negligibly contaminated by shaded soil, it can be inferred that LCC should be better estimated when the soil background is under shaded conditions than under sunlit conditions. They have also found significant canopy structure and solar angle effects on canopy reflectance spectra, especially for row-structured open crop canopies with varying sunlit and shaded soil backgrounds over seasonal and diurnal cycles. Result = DIALOG_MESSAGE("END!!",/INFORMATION)Ģ: header = header+'.Leaf chlorophyll content (LCC), as an important indicator of photosynthetic capacity and nitrogen status, has been non-destructively estimated from canopy reflectance spectra in recent studies. Printf,unit,'bands = '+ strcompress(365,/remove) Printf,unit,'lines = '+ strcompress(nl,/remove) Printf,unit,'samples = '+ strcompress(ns,/remove) Idlitwdprogressbar_setvalue, process,1+aa*i
Tmpdata = interpol(imgdata,365,/LSQUADRATIC) set your interpolation strategy Imgdata = convol(imgdata,New_savgolfilter,/EDGE_TRUNCATE) Process = Idlitwdprogressbar(GROUP_LEADER=wTlb,TIME=0,TITLE='') Savgolfilter=savgol(16,16,0,4) set your smoothing parameters for S-G filter To execute this IDL program, these 4 subroutines are put in the same document folder call the Main procedure PRO TEST_POINT to run the program.įile = 'E:\test.img' set your time-series remote sensing data to be processed. Users are expected to have sufficient knowledge in remote sensing image processing, and basic of IDL programing. The Savitzky-Golay filter and linear-interpolation functions were embed in IDL function library.
This program includes 4 subroutines, which were list in this document. Note: the program was developed in IDL 8.0, it should be executed in 8.0 or upper version of IDL programing platform.
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