http://www.oifii.org/ns-org/nsd/ar/sp/
ratio/html_m
Stephane Poirier
Relation between AR-SP library code http://www.oifii.org/ns-org/nsd/ar/sp/ratio/html_m
/ and Arnaud Mialon's chapter 2 figures (snowcover extent detection from SSM/I
brightness temps.)
Next-phase Goal
AR-SP ratio library source code is a generalization from AR-AM ratio library
AR-SP code is to be applied on both SMMR and SSM/I periods NSIDC's TBs.
AR-AM code was designed and validated mostly to the SSM/I periods NSIDC's TBs.
Currently uncertain if snow-free season is well localized in time when ratio library used with SMMR period TBs.
Current Wishes
Historically, only 2 seasons can be easily identified. A season where snow is present versus a season without any snow.
Currently uncertain if summer start day (or winter end) and summer end day (or winter start) are well identified when ratio library used with SMMR period TBs.
This presentation attempts to link the AR-SP ratio library source code lines implementing AR-AM ratio algorithms key concepts in order to validate and possibly improve the generalization.
http://www.oifii.org/ns-org/nsd/ar/sp/ratio/html_m/etape_ratio.html
Following step 1, 2, 3 and 4 is step 5 where function calcul_moyecart() is called
[moy_ete,ecart_ete,moy_hiver,ecart_hiver,seuil]=calcul_moyecart(zone,dataset,phase,pol,an,pathratio);
The function calcul_moyecart() computes averages and standard deviations for both snowfree and snowcovered periods as well as a threshold
calcul_moyecart() can also be found at link http://www.oifii.org/ns-org/nsd/ar/sp/ratio/html/calcul_moyecart.html(with line numbers and URLs for other matlab function names)
For both SMMR and SSM/I periods, the threshold is set using the line seuil=moy_ete-2.*ecart_ete; (line numbers 158, 253, 300 and 379 )
http://www.oifii.org/ns-org/nsd/ar/sp/ratio/html_m/calcul_moyecart.html
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