Get_Belanger_PP: Download Arctic primary production data from Belanger et al....

In chihlinwei/OceanData: Tools to download and extract oceanographic data from various sources

Download Arctic primary production data from Belanger et al. (2013)

Description

Download Arctic primary production data from Belanger et al. (2013) and then convert to a raster object.

Usage

Get_Belanger_PP(url, x, outdir = NULL, plot = FALSE)

Arguments

url	A character string naming the URL of a txt file to be downloaded
x	Raster* object defining the spatial extent, resolution and projection of climatology data to be retrived. If not provide, returning full data set.
outdir	output directory to write raster file
plot	Logical, whether or not to plot the output raster

Details

This function dowloads primary production data from Belanger et al (2013). The units of the variables: Chla : mg m^-3, KPUR : m^-1, PAR : E m^-2 month^-1, PP : mg C m^-2 month^-1

Value

a raster object

Author(s)

Chih-Lin Wei <[e-mail]>

Examples

# Raster template of Canadian Arctic
data(tmp)

# Download August 2010 as example
Get_Belanger_PP(url = "ftp://ftparcticnetl:[e-mail]/Arcticnet/donnees_pour_VRoy/Monthly_PAR_CHL_KPUR_PP_201008_52.0_-140.0_80.0_-50.0.txt", 
x = tmp, plot = TRUE)

# Use foreach loop to download monthly data from 1998 to 2010
library(RCurl)
library(foreach)
library(doSNOW)

# UQAR FTP server 
# Embed the User ID and Password in the URL
User <- "ftparcticnetl"
Pass <- "nord.a13"
url <- paste("ftp://", User, ":", Pass, "@ftp.uqar.ca/Arcticnet/donnees_pour_VRoy/", sep="")

filenames = getURL(url, ftp.use.epsv = FALSE, ftplistonly = TRUE, crlf = TRUE) 
filenames = paste(url, strsplit(filenames, "\r*\n")[[1]], sep = "") 

# Create a folder to save raster file
folder <- "../Arctic_ocean_data/Productivity_Belanger_2013/" 
dir.create(folder)

cl<-makeCluster(4) # change 4 to your number of CPU cores
registerDoSNOW(cl) # register the SNOW parallel backend with the foreach package
foreach(i=filenames, .packages="OceanData") %dopar% Get_Belanger_PP(i, tmp, folder)
stopCluster(cl) # stop a SNOW cluster

chihlinwei/OceanData documentation built on Jan. 17, 2025, 4:24 a.m.