pnm mod.destripe

Contents: Description, Arguments, Usage, Examples, Images, Related Functions Supported Under Version: > 1.69 Current Davinci Version: 2.27 64-bit Safe: No Description Destripe removes periodic scan lines introduced by sensor mis-calibration. This type of striping is often seen in Landsat MSS data (every 6th line) and Landsat TM data (every 16th line). This function will calculate the mean of lines either side of the Nth line and add the standard deviation of that mean. Located in "pnm_mod" module. Arguments and Return Values Inputs: an array containing orbital data Outputs: an array that has been cleaned up Usage Syntax: pnm_mod.destripe(data = VAL [,detectors = INT] ) data: any davinci array hopefully containing some Landsat data detectors: The number of detectors is the periodicity of the striping (i.e. 6 for MSS and 16 for TM). The algorithm assumes VERTICAL striping - i.e., the data should be in the acquired format (horizontal strips). Examples dv> a=read("A2/Tempe_Land_rect.vicar") .......A2/Tempe_Land_rect.vicar: VICAR bsq image: 1500x1500x7, 32 bits 1500x1500x7 array of float, bsq format [63,000,000 bytes] dv> b=pnm_mod.destripe(a,26) 1500x1500x7 array of float, bsq format [63,000,000 bytes] dv> display(do_dcs(a,7,5,2)) performing a 7-5-2 stretch Writing /tmp/dv_7970/wCDtVo: 1500x1500x3 PNG file. dv> display(do_dcs(b,7,5,2)) performing a 7-5-2 stretch Writing /tmp/dv_7970/Dokx8q: 1500x1500x3 PNG file. Images Two images (before-left and after-right pair). It is difficult to distinguish the difference in this case mostly because of the high signal to noise which lowers the visibility of the striping.

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