##################    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 separately 

#AUTHOR: Benoit Parmentier                                                                        

#DATE: 02/08/2013                                                                                 

#PROJECT: NCEAS INPLANT: Environment and Organisms --TASK#363--                                   

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

###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)

### Parameters and argument

infile2<-"list_365_dates_04212012.txt"

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

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

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)

nmodels<-9   #number of models running

y_var_name<-"dailyTmax"

predval<-1

seed_number<- 100  #if seed zero then no seed?                                                                 #Seed number for random sampling

out_prefix<-"_10d_GAM_fus5_all_lstd_02082013"                #User defined output prefix

bias_val<-0            #if value 1 then training data is used in the bias surface rather than the all monthly stations

bias_prediction<-1     #if value 1 then use GAM for the BIAS prediction otherwise GAM direct repdiction for y_var (daily tmax)

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

#projection used in the interpolation of the study area: should be read directly from the outline of the study area

#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";

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

source(file.path(script_path,"GAM_fusion_function_multisampling_02082013.R"))

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

###Reading the daily station data and setting up for models' comparison

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))

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

#Remove NA for LC and CANHEIGHT: Need to check this part after

ghcn$LC1[is.na(ghcn$LC1)]<-0

ghcn$LC3[is.na(ghcn$LC3)]<-0

ghcn$CANHEIGHT[is.na(ghcn$CANHEIGHT)]<-0

ghcn$LC4[is.na(ghcn$LC4)]<-0

ghcn$LC6[is.na(ghcn$LC6)]<-0

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

##Extracting the variables values from the raster files                                             

#The names of 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<-stack(infile3)                   #read in the data stack

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

#Deal with no data value and zero      

#pos<-match("LC1",layerNames(s_raster)) #Find column with name "value"

#LC1<-raster(s_raster,layer=pos)             #Select layer from stack

#s_raster<-dropLayer(s_raster,pos)

#LC1[is.na(LC1)]<-0

#pos<-match("LC3",layerNames(s_raster)) #Find column with name "value"

#LC3<-raster(s_raster,layer=pos)             #Select layer from stack

#s_raster<-dropLayer(s_raster,pos)

#LC3[is.na(LC3)]<-0

#pos<-match("CANHEIGHT",layerNames(s_raster)) #Find column with name "value"

#CANHEIGHT<-raster(s_raster,layer=pos)             #Select layer from stack

#s_raster<-dropLayer(s_raster,pos)

#CANHEIGHT[is.na(CANHEIGHT)]<-0

#pos<-match("ELEV_SRTM",layerNames(s_raster)) #Find column with name "ELEV_SRTM"

#ELEV_SRTM<-raster(s_raster,layer=pos)             #Select layer from stack on 10/30

#s_raster<-dropLayer(s_raster,pos)

#ELEV_SRTM[ELEV_SRTM <0]<-NA

#s_sgdf<-as(s_raster,"SpatialGridDataFrame") #Conversion to spatial grid data frame

######  Preparing tables for model assessment: specific diagnostic/metrics

#Model assessment: specific diagnostics/metrics

results_AIC<- matrix(1,1,nmodels+3)  

results_GCV<- matrix(1,1,nmodels+3)

results_DEV<- matrix(1,1,nmodels+3)

#results_RMSE_f<- matrix(1,length(models)+3)

#Model assessment: general diagnostic/metrics 

results_RMSE <- matrix(1,1,nmodels+4)

results_MAE <- matrix(1,1,nmodels+4)

results_ME <- matrix(1,1,nmodels+4)       #There are 8+1 models

results_R2 <- matrix(1,1,nmodels+4)       #Coef. of determination for the validation dataset

results_RMSE_f<- matrix(1,1,nmodels+4)    #RMSE fit, RMSE for the training dataset

results_MAE_f <- matrix(1,1,nmodels+4)

######### Preparing daily and monthly values for training and testing

#Screening for daily bad values: value is tmax in this case

#ghcn$value<-as.numeric(ghcn$value)

#ghcn_all<-ghcn

#ghcn_test<-subset(ghcn,ghcn$value>-150 & ghcn$value<400)

#ghcn_test<-ghcn

#ghcn_test2<-subset(ghcn_test,ghcn_test$elev_1>0)

#ghcn<-ghcn_test2

#coords<- ghcn[,c('x_OR83M','y_OR83M')]

#Now clean and screen monthly values

#dst_all<-dst

dst_all<-data3

dst<-data3

#dst<-subset(dst,dst$TMax>-15 & dst$TMax<45) #may choose different threshold??

#dst<-subset(dst,dst$ELEV_SRTM>0) #This will drop two stations...or 24 rows

##Sampling: 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

## 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

}

######## Prediction for the range of dates and sampling data

#gam_fus_mod<-mclapply(1:length(dates), runGAMFusion,mc.preschedule=FALSE,mc.cores = 8) #This is the end bracket from mclapply(...) statement

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

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

#gam_fus_mod2<-mclapply(4:4, runGAMFusion,mc.preschedule=FALSE,mc.cores = 1) #This is the end bracket from mclapply(...) statement

save(gam_fus_mod_s,file= paste(path,"/","results2_fusion_Assessment_measure_all",out_prefix,".RData",sep=""))

## Plotting and saving diagnostic measures

tb<-gam_fus_mod_s[[1]][[3]][0,]  #empty data frame with metric table structure that can be used in rbinding...

tb_tmp<-gam_fus_mod_s #copy

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

  tmp<-tb_tmp[[i]][[3]]

  tb<-rbind(tb,tmp)

}

rm(tb_tmp)

for(i in 4:ncol(tb)){            # start of the for loop #1

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

}

metrics<-as.character(unique(tb$metric))            #Name of accuracy metrics (RMSE,MAE etc.)

tb_metric_list<-vector("list",length(metrics))

for(i in 1:length(metrics)){            # Reorganizing information in terms of metrics 

  metric_name<-paste("tb_",metrics[i],sep="")

  tb_metric<-subset(tb, metric==metrics[i])

  tb_metric<-cbind(tb_metric,sampling_dat[,2:3])

  assign(metric_name,tb_metric)

  tb_metric_list[[i]]<-tb_metric

}

tb_diagnostic<-do.call(rbind,tb_metric_list)

tb_diagnostic[["prop"]]<-as.factor(tb_diagnostic[["prop"]])

mod_pat<-glob2rx("mod*")   

mod_var<-grep(mod_pat,names(tb_diagnostic),value=TRUE) # using grep with "value" extracts the matching names         

t<-melt(tb_diagnostic,

        measure=mod_var, 

        id=c("dates","metric","prop"),

        na.rm=F)

avg_tb<-cast(t,metric+prop~variable,mean)

median_tb<-cast(t,metric+prop~variable,median)

avg_tb[["prop"]]<-as.numeric(as.character(avg_tb[["prop"]]))

avg_RMSE<-subset(avg_tb,metric=="RMSE")

sampling_obj<-list(sampling_dat=sampling_dat,training=sampling, training_id=sampling_station_id, tb=tb_diagnostic)

write.table(avg_tb, file= paste(path,"/","results2_fusion_Assessment_measure_avg_",out_prefix,".txt",sep=""), sep=",")

write.table(median_tb, file= paste(path,"/","results2_fusion_Assessment_measure_median_",out_prefix,".txt",sep=""), sep=",")

write.table(tb_diagnostic, file= paste(path,"/","results2_fusion_Assessment_measure",out_prefix,".txt",sep=""), sep=",")

write.table(tb, file= paste(path,"/","results2_fusion_Assessment_measure_all",out_prefix,".txt",sep=""), sep=",")

save(sampling_obj, file= paste(path,"/","results2_fusion_sampling_obj",out_prefix,".RData",sep=""))

#save(gam_fus_mod_s,file= paste(path,"/","results2_fusion_Assessment_measure_all",out_prefix,".RData",sep=""))

gam_fus_mod_obj<-list(gam_fus_mod=gam_fus_mod_s,sampling_obj=sampling_obj)

save(gam_fus_mod_obj,file= paste(path,"/","results_mod_obj_",out_prefix,".RData",sep=""))

#### END OF SCRIPT