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e6cc535b
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Benoit Parmentier
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################## Data preparation for interpolation #######################################
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############################ Extraction of station data ##########################################
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d8a3533b
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Benoit Parmentier
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database_covaratiates_preparation<-function(list_param_prep){
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#This function performs queries on the Postgres ghcnd database for stations matching the
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#interpolation area. It requires 11 inputs:
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# 1) db.name : Postgres database name containing the meteorological stations
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# 2) var: the variable of interest - "TMAX","TMIN" or "PRCP"
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# 3) range_years: range of records used in the daily interpolation, note that upper bound year is not included
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# 4) range_years_clim: range of records used in the monthly climatology interpolation, note that upper bound is not included
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# 5) infile1: region outline as a shape file - used in the interpolation stage too
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# 6) infile2: ghcnd stations locations as a textfile name with lat-long fields
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5dd036ba
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Benoit Parmentier
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# 7) infile_covarariates: tif file of raser covariates for the interpolation area: it should have a local projection
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d8a3533b
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Benoit Parmentier
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# 8) CRS_locs_WGS84: longlat EPSG 4326 used as coordinates reference system (proj4)for stations locations
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# 9) in_path: input path for covariates data and other files, this is also the output?
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# 10) covar_names: names of covariates used for the interpolation --may be removed later? (should be stored in the brick)
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# 11) out_prefix: output suffix added to output names--it is the same in the interpolation script
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#
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#The output is a list of four shapefile names produced by the function:
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#1) loc_stations: locations of stations as shapefile in EPSG 4326
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#2) loc_stations_ghcn: ghcn daily data for the year range of interpolation (locally projected)
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#3) daily_covar_ghcn_data: ghcn daily data with covariates for the year range of interpolation (locally projected)
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#4) monthly_covar_ghcn_data: ghcn daily data with covariates for the year range of interpolation (locally projected)
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#AUTHOR: Benoit Parmentier
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#DATE: 03/01/2013
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#PROJECT: NCEAS INPLANT: Environment and Organisms --TASK#363--
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#Comments and TODO
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#-Add buffer option...
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#-Add output path argument option
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#-Add qc flag options
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##################################################################################################
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###Loading R library and packages: should it be read in before???
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library(RPostgreSQL)
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library(sp) # Spatial pacakge with class definition by Bivand et al.
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library(spdep) # Spatial pacakge with methods and spatial stat. by Bivand et al.
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library(rgdal) # GDAL wrapper for R, spatial utilities
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library(rgeos)
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library(rgdal)
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library(raster)
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library(rasterVis)
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### Functions used in the script
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format_s <-function(s_ID){
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#Format station ID in a vector format/tuple that is used in a psql query.
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# Argument 1: vector of station ID
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# Return: character of station ID
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tx2<-s_ID
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tx2<-as.character(tx2)
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stat_list<-tx2
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temp<-shQuote(stat_list)
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t<-paste(temp, collapse= " ")
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t1<-gsub(" ", ",",t)
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sf_ID<-paste("(",t1,")",sep="") #vector containing the station ID to query
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return(sf_ID)
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}
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#parsing input arguments
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db.name <- list_param_prep$db.name #name of the Postgres database
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var <- list_param_prep$var #name of the variables to keep: TMIN, TMAX or PRCP
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year_start <-list_param_prep$range_years[1] #"2010" #starting year for the query (included)
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year_end <-list_param_prep$range_years[2] #"2011" #end year for the query (excluded)
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year_start_clim <-list_param_prep$range_years_clim[1] #right bound not included in the range!! starting year for monthly query to calculate clime
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infile1<- list_param_prep$infile1 #This is the shape file of outline of the study area #It is an input/output of the covariate script
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infile2<-list_param_prep$infile2 #"/home/layers/data/climate/ghcn/v2.92-upd-2012052822/ghcnd-stations.txt" #This is the textfile of station locations from GHCND
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5dd036ba
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Benoit Parmentier
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infile3<-list_param_prep$infile_covariates #"covariates__venezuela_region__VE_01292013.tif" #this is an output from covariate script
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d8a3533b
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Benoit Parmentier
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CRS_locs_WGS84<-list_param_prep$CRS_locs_WGS84 #Station coords WGS84: same as earlier
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in_path <- list_param_prep$in_path #CRS_locs_WGS84"/home/parmentier/Data/IPLANT_project/Venezuela_interpolation/Venezuela_01142013/input_data/"
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out_prefix<-list_param_prep$out_prefix #"_365d_GAM_fus5_all_lstd_03012013" #User defined output prefix
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#qc_flags<-list_param_prep$qc_flags flags allowed for the query from the GHCND??
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covar_names<-list_param_prep$covar_names # names should be written in the tif file!!!
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## working directory is the same for input and output for this function
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setwd(in_path)
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##### STEP 1: Select station in the study area
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filename<-sub(".shp","",infile1) #Removing the extension from file.
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interp_area <- readOGR(".",filename)
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CRS_interp<-proj4string(interp_area) #Storing the coordinate information: geographic coordinates longlat WGS84
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#Read in GHCND database station locations
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dat_stat <- read.fwf(infile2,
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widths = c(11,9,10,7,3,31,4,4,6),fill=TRUE)
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colnames(dat_stat)<-c("STAT_ID","lat","lon","elev","state","name","GSNF","HCNF","WMOID")
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coords<- dat_stat[,c('lon','lat')]
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coordinates(dat_stat)<-coords
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proj4string(dat_stat)<-CRS_locs_WGS84 #this is the WGS84 projection
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#proj4string(dat_stat)<-CRS_interp
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dat_stat2<-spTransform(dat_stat,CRS(CRS_interp)) # Project from WGS84 to new coord. system
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# Spatial query to find relevant stations
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inside <- !is.na(over(dat_stat2, as(interp_area, "SpatialPolygons"))) #Finding stations contained in the current interpolation area
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stat_reg<-dat_stat2[inside,] #Selecting stations contained in the current interpolation area
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####
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##TODO: Add buffer option?
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####
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#### STEP 2: Connecting to the database and query for relevant data
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drv <- dbDriver("PostgreSQL")
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db <- dbConnect(drv, dbname=db.name)
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time1<-proc.time() #Start stop watch
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list_s<-format_s(stat_reg$STAT_ID)
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data2<-dbGetQuery(db, paste("SELECT *
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FROM ghcn
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WHERE element=",shQuote(var),
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"AND year>=",year_start,
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"AND year<",year_end,
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"AND station IN ",list_s,";",sep="")) #Selecting station using a SQL query
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time_duration<-proc.time()-time1 #Time for the query may be long given the size of the database
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time_minutes<-time_duration[3]/60
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dbDisconnect(db)
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###
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#Add month query and averages here...
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###
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#data2 contains only 46 stations for Venezueal area??
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data_table<-merge(data2,as.data.frame(stat_reg), by.x = "station", by.y = "STAT_ID")
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#Transform the subset data frame in a spatial data frame and reproject
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data_reg<-data_table #Make a copy of the data frame
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coords<- data_reg[c('lon','lat')] #Define coordinates in a data frame: clean up here!!
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#Wrong label...it is in fact projected...
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coordinates(data_reg)<-coords #Assign coordinates to the data frame
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#proj4string(data3)<-locs_coord #Assign coordinates reference system in PROJ4 format
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proj4string(data_reg)<-CRS_locs_WGS84 #Assign coordinates reference system in PROJ4 format
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data_reg<-spTransform(data_reg,CRS(CRS_interp)) #Project from WGS84 to new coord. system
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##################################################################
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### STEP 3: Save results and outuput in textfile and a shape file
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#browser()
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#Save shape files of the locations of meteorological stations in the study area
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outfile1<-file.path(in_path,paste("stations","_",out_prefix,".shp",sep=""))
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writeOGR(stat_reg,dsn= dirname(outfile1),layer= sub(".shp","",basename(outfile1)), driver="ESRI Shapefile",overwrite_layer=TRUE)
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#writeOGR(dst,dsn= ".",layer= sub(".shp","",outfile4), driver="ESRI Shapefile",overwrite_layer=TRUE)
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outfile2<-file.path(in_path,paste("ghcn_data_",var,"_",year_start_clim,"_",year_end,out_prefix,".shp",sep="")) #Name of the file
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#writeOGR(data_proj, paste(outfile, "shp", sep="."), outfile, driver ="ESRI Shapefile") #Note that the layer name is the file name without extension
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writeOGR(data_reg,dsn= dirname(outfile2),layer= sub(".shp","",basename(outfile2)), driver="ESRI Shapefile",overwrite_layer=TRUE)
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###################################################################
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### STEP 4: Extract values at stations from covariates stack of raster images
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#Eventually this step may be skipped if the covariates information is stored in the database...
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s_raster<-stack(infile3) #read in the data stack
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names(s_raster)<-covar_names #Assigning names to the raster layers: making sure it is included in the extraction
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stat_val<- extract(s_raster, data_reg) #Extracting values from the raster stack for every point location in coords data frame.
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#create a shape file and data_frame with names
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data_RST<-as.data.frame(stat_val) #This creates a data frame with the values extracted
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data_RST_SDF<-cbind(data_reg,data_RST)
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coordinates(data_RST_SDF)<-coordinates(data_reg) #Transforming data_RST_SDF into a spatial point dataframe
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CRS_reg<-proj4string(data_reg)
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proj4string(data_RST_SDF)<-CRS_reg #Need to assign coordinates...
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#Creating a date column
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date1<-ISOdate(data_RST_SDF$year,data_RST_SDF$month,data_RST_SDF$day) #Creating a date object from 3 separate column
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date2<-gsub("-","",as.character(as.Date(date1)))
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data_RST_SDF$date<-date2 #Date format (year,month,day) is the following: "20100627"
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#This allows to change only one name of the data.frame
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pos<-match("value",names(data_RST_SDF)) #Find column with name "value"
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if (var=="TMAX"){
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#names(data_RST_SDF)[pos]<-c("TMax")
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data_RST_SDF$value<-data_RST_SDF$value/10 #TMax is the average max temp for monthy data
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}
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#write out a new shapefile (including .prj component)
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outfile3<-file.path(in_path,paste("daily_covariates_ghcn_data_",var,"_",range_years[1],"_",range_years[2],out_prefix,".shp",sep="")) #Name of the file
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writeOGR(data_RST_SDF,dsn= dirname(outfile3),layer= sub(".shp","",basename(outfile3)), driver="ESRI Shapefile",overwrite_layer=TRUE)
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###############################################################
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######## STEP 5: Preparing monthly averages from the ProstGres database
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drv <- dbDriver("PostgreSQL")
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db <- dbConnect(drv, dbname=db.name)
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#year_start_clim: set at the start of the script
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year_end<-2011
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time1<-proc.time() #Start stop watch
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list_s<-format_s(stat_reg$STAT_ID)
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data_m<-dbGetQuery(db, paste("SELECT *
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FROM ghcn
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WHERE element=",shQuote(var),
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"AND year>=",year_start_clim,
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"AND year<",year_end,
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"AND station IN ",list_s,";",sep="")) #Selecting station using a SQL query
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time_duration<-proc.time()-time1 #Time for the query may be long given the size of the database
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time_minutes<-time_duration[3]/60
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dbDisconnect(db)
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#Clean out this section!!
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date1<-ISOdate(data_m$year,data_m$month,data_m$day) #Creating a date object from 3 separate column
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date2<-as.POSIXlt(as.Date(date1))
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data_m$date<-date2
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#In Venezuela and other regions where there are not many stations...mflag==S should be added..see Durenne etal.2010.
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#d<-subset(data_m,year>=2000 & mflag=="0" ) #Selecting dataset 2000-2010 with good quality: 193 stations
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d<-subset(data_m,mflag=="0" | mflag=="S") #should be input arguments!!
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#May need some screeing??? i.e. range of temp and elevation...
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d1<-aggregate(value~station+month, data=d, mean) #Calculate monthly mean for every station in OR
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id<-as.data.frame(unique(d1$station)) #Unique station in OR for year 2000-2010: 193 but 7 loss of monthly avg
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dst<-merge(d1, stat_reg, by.x="station", by.y="STAT_ID") #Inner join all columns are retained
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#This allows to change only one name of the data.frame
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pos<-match("value",names(dst)) #Find column with name "value"
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if (var=="TMAX"){
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names(dst)[pos]<-c("TMax")
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dst$TMax<-dst$TMax/10 #TMax is the average max temp for monthy data
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}
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#Extracting covariates from stack for the monthly dataset...
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coords<- dst[c('lon','lat')] #Define coordinates in a data frame
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coordinates(dst)<-coords #Assign coordinates to the data frame
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proj4string(dst)<-CRS_locs_WGS84 #Assign coordinates reference system in PROJ4 format
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dst_month<-spTransform(dst,CRS(CRS_interp)) #Project from WGS84 to new coord. system
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stations_val<-extract(s_raster,dst_month) #extraction of the infomration at station location
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stations_val<-as.data.frame(stations_val)
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dst_extract<-cbind(dst_month,stations_val) #this is in sinusoidal from the raster stack
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dst<-dst_extract
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coords<- dst[c('x','y')] #Define coordinates in a data frame, this is the local x,y
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coordinates(dst)<-coords #Assign coordinates to the data frame
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proj4string(dst)<-projection(s_raster) #Assign coordinates reference system in PROJ4 format
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####
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#write out a new shapefile (including .prj component)
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dst$OID<-1:nrow(dst) #need a unique ID?
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outfile4<-file.path(in_path,paste("monthly_covariates_ghcn_data_",var,"_",year_start_clim,"_",year_end,out_prefix,".shp",sep="")) #Name of the file
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writeOGR(dst,dsn= dirname(outfile4),layer= sub(".shp","",basename(outfile4)), driver="ESRI Shapefile",overwrite_layer=TRUE)
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### list of outputs return
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outfiles_obj<-list(outfile1,outfile2,outfile3,outfile4)
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names(outfiles_obj)<- c("loc_stations","loc_stations_ghcn","daily_covar_ghcn_data","monthly_covar_ghcn_data")
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return(outfiles_obj)
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#END OF FUNCTION #
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6a5b56da
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Benoit Parmentier
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}
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e6cc535b
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Benoit Parmentier
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##### END OF SCRIPT ##########
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