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4. %nakedsoftware.org opensource license, copyright 2010 stephane.poirier@oifii.org % %developed by Stephane Poirier, M.Sc. Optical Physics, Remote Sensing Application Software Developer (1991-2010) % %this function is part of oifii.org's ar\sp\ Microwave- derived 30-year Canada-Alaska Daily Temperature and Snowcover Databases library % %this function is part of oifii.org's ar\sp\ratio application (lauched with ar\sp\main_ratio.m) %oifii.org's ar\sp\ratio application is part of the oifii.org's ar\sp set of applications which %may also contain similar variant versions of this function with identical filename. % %A geophysical research paper about this work has been submitted in June 2009 for publication in JGR-Atmosphere %Royer, A. and Poirier S., Surface temperature spatial and temporal variations in North America from homogenized %satellite SMMR-SSM/I microwave measurements and reanalysis for 1979-2008, Journal of Geophysical Research - Atmosphere, %Submitted June 2009, http://www.oifii.org/tsatdb/Royer- Poirier_Microwave-derived-daily-surface- temperature_JGR2009JD012760_R2.pdf % %This study's database can be downloaded from the author web site at: %http://www.oifii.org/tsatdb/Royer-Poirier_Microwave-derived- daily-surface-temperature-db_1979-2008.zip % %this function is used to read the ratio-derived thresholds (ref. Arnaud Mialon, PhD Thesis, Chapter 2, Snowcover extent) %fonction pour lire les données seuil % %nakedsoftware.org opensource license, copyright 2010 stephane.poirier@oifii.org

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7. function [seuil]=lire_seuil(zone,phase,pol,an,pathratio) prevdir=pwd; if strcmp(zone,'canada') == 1 dim=[160 240]; m=masque(2,2); elseif strcmp(zone,'russie') == 1 dim=[230 310]; m=masque(7,2); elseif strcmp(zone,'tibet') == 1 dim=[90 180]; end phase=lower(phase); %spi, april 2009, begin %direction=[pathratio,filesep,'ratio_',zone,filesep,'fichier_ moyecarttype',filesep,int2str(an)]; direction=[pathratio,filesep,'ratio_',zone,filesep,'fichier_m oyecarttype']; feval('cd',direction); clear direction; %fichierseuil=['seuilete',phase]; fichierseuil=['seuilete',phase,int2str(an)]; %spi, april 2009, end f=fopen(fichierseuil,'r'); seuil=fread(f,[dim(1) dim(2)],'float32'); seuil=seuil.*m; fclose(f);clear f; cd(prevdir); end%function