##################    MULTI SAMPLING GAM FUSION METHOD ASSESSMENT   ####################################

############################ Merging LST and station data ##########################################

#This script interpolates tmax values using MODIS LST and GHCND station data                      

#interpolation area. It requires the text file of stations and a shape file of the study area.           

#Note that the projection for both GHCND and study area is lonlat WGS84.       

#Options to run this program are:

#1) Multisampling: vary the porportions of hold out and use random samples for each run

#2)Constant sampling: use the same sample over the runs

#3)over dates: run over for example 365 dates without mulitsampling

#4)use seed number: use seed if random samples must be repeatable

#5)GAM fusion: possibilty of running GAM+FUSION or GAM+CAI and other options added

#The interpolation is done first at the monthly time scale then delta surfaces are added.

#AUTHOR: Benoit Parmentier                                                                        

#DATE: 02/26/2013                                                                                 

#PROJECT: NCEAS INPLANT: Environment and Organisms --TASK#568--                                   

###################################################################################################

###Loading R library and packages                                                      

library(gtools)                                         # loading some useful tools 

library(mgcv)                                           # GAM package by Simon Wood

library(sp)                                             # Spatial pacakge with class definition by Bivand et al.

library(spdep)                               # Spatial pacakge with methods and spatial stat. by Bivand et al.

library(rgdal)                               # GDAL wrapper for R, spatial utilities

library(gstat)                               # Kriging and co-kriging by Pebesma et al.

library(fields)                             # NCAR Spatial Interpolation methods such as kriging, splines

library(raster)                              # Hijmans et al. package for raster processing

library(rasterVis)

library(parallel)                            # Urbanek S. and Ripley B., package for multi cores & parralel processing

library(reshape)

library(plotrix)

library(maptools)

### Parameters and argument

infile2<-"list_365_dates_04212012.txt"

## output param from previous script: Database_stations_covariates_processing_function

infile_monthly<-"monthly_covariates_ghcn_data_TMAXy2010_2010_VE_02082013.shp"

infile_daily<-"daily_covariates_ghcn_data_TMAXy2010_2010_VE_02082013.shp"

infile_locs<-"stations_venezuela_region_y2010_2010_VE_02082013.shp"

infile3<-"covariates__venezuela_region__VE_01292013.tif" #this is an output from covariate script

var<-"TMAX"

out_prefix<-"_365d_GAM_fus5_all_lstd_02202013"                #User defined output prefix

CRS_locs_WGS84<-CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +towgs84=0,0,0") #Station coords WGS84: same as earlier

#CRS_interp<-"+proj=lcc +lat_1=43 +lat_2=45.5 +lat_0=41.75 +lon_0=-120.5 +x_0=400000 +y_0=0 +ellps=GRS80 +units=m +no_defs";

#infile_monthly<-"monthly_covariates_ghcn_data_TMAXy2010_2010_VE_02082013.shp" #outile4 from database_covar script

#infile_daily<-"daily_covariates_ghcn_data_TMAXy2010_2010_VE_02082013.shp"  #outfile3 from database_covar script

#infile_locs<-"stations_venezuela_region_y2010_2010_VE_02082013.shp" #outfile2? from database covar script

###

if (var=="TMAX"){

  y_var_name<-"dailyTmax"                                       

}

if (var=="TMIN"){

  y_var_name<-"dailyTmin"                                       

}

#Input for sampling function...

seed_number<- 100  #if seed zero then no seed?     

nb_sample<-1           #number of time random sampling must be repeated for every hold out proportion

prop_min<-0.3          #if prop_min=prop_max and step=0 then predicitons are done for the number of dates...

prop_max<-0.3

step<-0         

constant<-0             #if value 1 then use the same samples as date one for the all set of dates

#Models to run...this can be change for each run

list_models<-c("y_var ~ s(elev_1)",

               "y_var ~ s(LST)",

               "y_var ~ s(elev_1,LST)",

               "y_var ~ s(lat) + s(lon)+ s(elev_1)",

               "y_var ~ s(lat,lon,elev_1)",

               "y_var ~ s(lat,lon) + s(elev_1) + s(N_w,E_w) + s(LST)", 

               "y_var ~ s(lat,lon) + s(elev_1) + s(N_w,E_w) + s(LST) + s(LC2)",

               "y_var ~ s(lat,lon) + s(elev_1) + s(N_w,E_w) + s(LST) + s(LC6)", 

               "y_var ~ s(lat,lon) + s(elev_1) + s(N_w,E_w) + s(LST) + s(DISTOC)")

#Choose interpolation method...

interpolation_method<-c("gam_fusion","gam_CAI") #other otpions to be added later

#Default name of LST avg to be matched               

lst_avg<-c("mm_01","mm_02","mm_03","mm_04","mm_05","mm_06","mm_07","mm_08","mm_09","mm_10","mm_11","mm_12")  

in_path<-"/home/parmentier/Data/IPLANT_project/Venezuela_interpolation/Venezuela_01142013/input_data"

#Create on the fly output folder...

out_path<-"/home/parmentier/Data/IPLANT_project/Venezuela_interpolation/Venezuela_01142013/output_data"

script_path<-"/home/parmentier/Data/IPLANT_project/Venezuela_interpolation/Venezuela_01142013/"

setwd(in_path)

source(file.path(script_path,"GAM_fusion_function_multisampling_02262013.R"))

source(file.path(script_path,"GAM_fusion_function_multisampling_validation_metrics_02262013.R"))

###################### START OF THE SCRIPT ########################

################# CREATE LOG FILE #####################

#create log file to keep track of details such as processing times and parameters.

log_fname<-paste("R_log_t",out_prefix, ".log",sep="")

if (file.exists(log_fname)){  #Stop the script???

  file.remove(log_fname)

  log_file<-file(log_fname,"w")

}

if (!file.exists(log_fname)){

  log_file<-file(log_fname,"w")

}

time1<-proc.time()    #Start stop watch

writeLines(paste("Starting script at this local Date and Time: ",as.character(Sys.time()),sep=""),

           con=log_file,sep="\n")

writeLines("Starting script process time:",con=log_file,sep="\n")

writeLines(as.character(time1),con=log_file,sep="\n")    

############### Reading the daily station data and other data #################

ghcn<-readOGR(dsn=in_path,layer=sub(".shp","",infile_daily))

CRS_interp<-proj4string(ghcn)                       #Storing projection information (ellipsoid, datum,etc.)

stat_loc<-readOGR(dsn=in_path,layer=sub(".shp","",infile_locs))

dates <-readLines(file.path(in_path,infile2)) #dates to be predicted

#Reading of covariate brick covariates can be changed...

rnames <-c("x","y","lon","lat","N","E","N_w","E_w","elev","slope","aspect","CANHEIGHT","DISTOC")

lc_names<-c("LC1","LC2","LC3","LC4","LC5","LC6","LC7","LC8","LC9","LC10","LC11","LC12")

lst_names<-c("mm_01","mm_02","mm_03","mm_04","mm_05","mm_06","mm_07","mm_08","mm_09","mm_10","mm_11","mm_12",

                    "nobs_01","nobs_02","nobs_03","nobs_04","nobs_05","nobs_06","nobs_07","nobs_08",

                    "nobs_09","nobs_10","nobs_11","nobs_12")                  

covar_names<-c(rnames,lc_names,lst_names)                

s_raster<-brick(infile3)                   #read in the data brck

names(s_raster)<-covar_names               #Assigning names to the raster layers: making sure it is included in the extraction

#Reading monthly data

data3<-readOGR(dsn=in_path,layer=sub(".shp","",infile_monthly))

dst_all<-data3

dst<-data3

### TO DO -important ###

#Cleaning/sceerniging functions for daily stations, monthly stations and covariates?? do this at the preparation stage!!!

##

##### Create sampling: select training and testing sites ###

#Make this a a function!!!!

if (seed_number>0) {

  set.seed(seed_number)                        #Using a seed number allow results based on random number to be compared...

}

nel<-length(dates)

dates_list<-vector("list",nel) #list of one row data.frame

prop_range<-(seq(from=prop_min,to=prop_max,by=step))*100     #range of proportion to run

sn<-length(dates)*nb_sample*length(prop_range)               #Number of samples to run

for(i in 1:length(dates)){

  d_tmp<-rep(dates[i],nb_sample*length(prop_range)) #repeating same date

  s_nb<-rep(1:nb_sample,length(prop_range))         #number of random sample per proportion

  prop_tmp<-sort(rep(prop_range, nb_sample))

  tab_run_tmp<-cbind(d_tmp,s_nb,prop_tmp)

  dates_list[[i]]<-tab_run_tmp

}

sampling_dat<-as.data.frame(do.call(rbind,dates_list))

names(sampling_dat)<-c("date","run_samp","prop")

for(i in 2:3){            # start of the for loop #1

  sampling_dat[,i]<-as.numeric(as.character(sampling_dat[,i]))  

}

sampling_dat$date<- as.character(sampling_dat[,1])

#ghcn.subsets <-lapply(dates, function(d) subset(ghcn, date==d)) #this creates a list of 10 or 365 subsets dataset based on dates

ghcn.subsets <-lapply(as.character(sampling_dat$date), function(d) subset(ghcn, date==d)) #this creates a list of 10 or 365 subsets dataset based on dates

#Make this a function??

## adding choice of constant sample 

if (seed_number>0) {

  set.seed(seed_number)                        #Using a seed number allow results based on random number to be compared...

}

sampling<-vector("list",length(ghcn.subsets))

sampling_station_id<-vector("list",length(ghcn.subsets))

for(i in 1:length(ghcn.subsets)){

  n<-nrow(ghcn.subsets[[i]])

  prop<-(sampling_dat$prop[i])/100

  ns<-n-round(n*prop)   #Create a sample from the data frame with 70% of the rows

  nv<-n-ns              #create a sample for validation with prop of the rows

  ind.training <- sample(nrow(ghcn.subsets[[i]]), size=ns, replace=FALSE) #This selects the index position for 70% of the rows taken randomly

  ind.testing <- setdiff(1:nrow(ghcn.subsets[[i]]), ind.training)

  #Find the corresponding 

  data_sampled<-ghcn.subsets[[i]][ind.training,] #selected the randomly sampled stations

  station_id.training<-data_sampled$station     #selected id for the randomly sampled stations (115)

  #Save the information

  sampling[[i]]<-ind.training

  sampling_station_id[[i]]<- station_id.training

}

## Use same samples across the year...

if (constant==1){

  sampled<-sampling[[1]]

  data_sampled<-ghcn.subsets[[1]][sampled,] #selected the randomly sampled stations

  station_sampled<-data_sampled$station     #selected id for the randomly sampled stations (115)

  list_const_sampling<-vector("list",sn)

  list_const_sampling_station_id<-vector("list",sn)

  for(i in 1:sn){

    station_id.training<-intersect(station_sampled,ghcn.subsets[[i]]$station)

    ind.training<-match(station_id.training,ghcn.subsets[[i]]$station)

    list_const_sampling[[i]]<-ind.training

    list_const_sampling_station_id[[i]]<-station_id.training

  }

  sampling<-list_const_sampling 

  sampling_station_id<-list_const_sampling_station_id

}

#return()

########### PREDICT FOR MONTHLY SCALE  #############

#First predict at the monthly time scale: climatology

writeLines("Predictions at monthly scale:",con=log_file,sep="\n")

t1<-proc.time()

gamclim_fus_mod<-mclapply(1:12, runClim_KGFusion,mc.preschedule=FALSE,mc.cores = 6) #This is the end bracket from mclapply(...) statement

#gamclim_fus_mod<-mclapply(1:12, runClim_KGFusion,mc.preschedule=FALSE,mc.cores = 4) #This is the end bracket from mclapply(...) statement

save(gamclim_fus_mod,file= paste("gamclim_fus_mod",out_prefix,".RData",sep=""))

t2<-proc.time()-t1

writeLines(as.character(t2),con=log_file,sep="\n")

#now get list of raster clim layers

list_tmp<-vector("list",length(gamclim_fus_mod))

for (i in 1:length(gamclim_fus_mod)){

  tmp<-gamclim_fus_mod[[i]]$clim

  list_tmp[[i]]<-tmp

}

################## PREDICT AT DAILY TIME SCALE #################

#put together list of clim models per month...

rast_clim_yearlist<-list_tmp

#Second predict at the daily time scale: delta

#gam_fus_mod<-mclapply(1:1, runGAMFusion,mc.preschedule=FALSE,mc.cores = 1) #This is the end bracket from mclapply(...) statement

writeLines("Predictions at the daily scale:",con=log_file,sep="\n")

t1<-proc.time()

gam_fus_mod<-mclapply(1:length(ghcn.subsets), runGAMFusion,mc.preschedule=FALSE,mc.cores = 9) #This is the end bracket from mclapply(...) statement

save(gam_fus_mod,file= paste("gam_fus_mod",out_prefix,".RData",sep=""))

t2<-proc.time()-t1

writeLines(as.character(t2),con=log_file,sep="\n")

############### NOW RUN VALIDATION #########################

list_tmp<-vector("list",length(gam_fus_mod))

for (i in 1:length(gam_fus_mod)){

  tmp<-gam_fus_mod[[i]][[y_var_name]]  #y_var_name is the variable predicted (tmax or tmin)

  list_tmp[[i]]<-tmp

}

rast_day_yearlist<-list_tmp #list of predicted images

writeLines("Validation step:",con=log_file,sep="\n")

t1<-proc.time()

#calculate_accuary_metrics<-function(i)

gam_fus_validation_mod<-mclapply(1:length(gam_fus_mod), calculate_accuracy_metrics,mc.preschedule=FALSE,mc.cores = 9) #This is the end bracket from mclapply(...) statement

#gam_fus_validation_mod<-mclapply(1:1, calculate_accuracy_metrics,mc.preschedule=FALSE,mc.cores = 1) #This is the end bracket from mclapply(...) statement

save(gam_fus_validation_mod,file= paste("gam_fus_validation_mod",out_prefix,".RData",sep=""))

t2<-proc.time()-t1

writeLines(as.character(t2),con=log_file,sep="\n")

#################### ASSESSMENT OF PREDICTIONS: PLOTS OF ACCURACY METRICS ###########

##Create data.frame with valiation metrics for a full year

tb_diagnostic_v<-extract_from_list_obj(gam_fus_validation_mod,"metrics_v")

rownames(tb_diagnostic_v)<-NULL #remove row names

#Call function to create plots of metrics for validation dataset

metric_names<-c("rmse","mae","me","r","m50")

summary_metrics<-boxplot_from_tb(tb_diagnostic_v,metric_names,out_prefix)

names(summary_metrics)<-c("avg","median")

##Write out information concerning accuracy and predictions

outfile<-file.path(in_path,paste("assessment_measures_",out_prefix,".txt",sep=""))

write.table(tb_diagnostic_v,file= outfile,row.names=FALSE,sep=",")

write.table(summary_metrics[[1]], file= outfile, append=TRUE,sep=",") #write out avg

write.table(summary_metrics[[2]], file= outfile, append=TRUE,sep=",") #write out median

#################### CLOSE LOG FILE  #############

#close log_file connection and add meta data

writeLines("Finished script process time:",con=log_file,sep="\n")

time2<-proc.time()-time1

writeLines(as.character(time2),con=log_file,sep="\n")

#later on add all the paramters used in the script...

writeLines(paste("Finished script at this local Date and Time: ",as.character(Sys.time()),sep=""),

           con=log_file,sep="\n")

writeLines("End of script",con=log_file,sep="\n")

close(log_file)

############################################################

######################## END OF SCRIPT #####################