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+title: daymetr
+description: R package to download tiled and single pixel daymet data from the ORNL DAAC
+google_analytics: 
+show_downloads: true
+theme: jekyll-theme-minimal
+
+gems:
+  - jekyll-mentions

index.md

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+[![Build Status](https://travis-ci.org/khufkens/daymetr.svg?branch=master)](https://travis-ci.org/khufkens/daymetr)
+
+# daymetr
+
+The **daymetr** R package provides functions to (batch) download single pixel or gridded [daymet data](http://daymet.ornl.gov/) (tiled) data directly into your R workspace, or save them as csv/tif files on your computer. Gridded (tiled) data downloads for a region of interest are specified by a top left / bottom right coordinate pair or a single pixel location.
+
+## Installation
+
+clone the project to your home computer using the following command (with git installed)
+
+```R
+require(devtools)
+install_github("khufkens/daymetr") # install the package
+library(daymetr) # load the package
+```
+
+## Use
+
+### Single pixel location download
+
+For a single site use the following format
+
+```R
+ download.daymet(site="Oak Ridge National Laboratories",lat=36.0133,lon=-84.2625,start_yr=1980,end_yr=2010,internal=TRUE)
+```
+
+Parameter     | Description                      
+------------- | ------------------------------ 	
+site	      | site name
+lat           | latitude of the site
+lon           | longitude of the site
+start_yr      | start year of the time series (data start in 1980)
+end_yr        | end year of the time series (current year - 2 years / for safety, tweak this check to reflect the currently available data)
+internal      | logical, TRUE or FALSE, if true data is imported into R workspace otherwise it is downloaded into the current working directory
+
+Batch mode uses similar parameters but you provide a comma separated file with site names and latitude longitude which are sequentially downloaded. Format of the comma separated file is as such: site name, latitude, longitude.
+
+```R
+batch.download.daymet(file_location='my_sites.csv',start_yr=1980,end_yr=2010,internal=TRUE)
+```
+
+### Gridded data download
+
+For gridded data use the following format
+
+```R
+download.daymet.tiles(lat1=36.0133,lon1=-84.2625,lat2=NA,lon2=NA,start_yr=1980,end_yr=2012,param="ALL")
+```
+
+Parameter     | Description                      
+------------- | ------------------------------ 	
+lat1	      | top left latitude
+lon1          | top left longitude
+lat2          | bottom right latitude (can be empty)
+lon2	      | bottom right latitude (can be empty)
+start_yr      | start year of the time series (data start in 1980)
+end_yr        | end year of the time series (current year - 2 years / for safety, tweak this check to reflect the currently available data)
+param         | climate variable you want to download vapour pressure (vp), minimum and maximum temperature (tmin,tmax), snow water equivalent (swe), solar radiation (srad), precipitation (prcp) , day length (dayl). The default setting is ALL, this will download all the previously mentioned climate variables.
+
+If only the first set of coordinates is provided the tile in which these reside is downloaded. If your region of interest falls outside the scope of the DAYMET data coverage a warning is issued. If both top left and bottom right coordinates are provided all tiles covering the region of interst are downloaded. I would caution against downloading too much data, as file sizes do add up. So be careful how you specify your region of interest.
+
+### Dependencies
+
+The code depends on the following R packages: sp, rgdal, curl and will be installed alongside the daymetr package.