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https://github.com/bluegreen-labs/snotelr

a snow data network (SNOTEL) R package
https://github.com/bluegreen-labs/snotelr

climate-data data-retrieval precipitation-data r-package rstats snotel snow

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a snow data network (SNOTEL) R package

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# snotelr

[![R-CMD-check](https://github.com/bluegreen-labs/snotelr/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/bluegreen-labs/snotelr/actions/workflows/R-CMD-check.yaml)
[![codecov](https://codecov.io/gh/bluegreen-labs/snotelr/branch/master/graph/badge.svg)](https://app.codecov.io/gh/bluegreen-labs/snotelr)
[![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/snotelr)](https://cran.r-project.org/package=snotelr)
[![](https://cranlogs.r-pkg.org/badges/grand-total/snotelr)](https://cran.r-project.org/package=snotelr)
[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.7012728.svg)](https://doi.org/10.5281/zenodo.7012728)

`snotelr` is an R toolbox to facilitate easy SNOTEL data exploration and downloads through a convenient R [shiny](https://shiny.posit.co/) based GUI. In addition it provides a routine to extract basic snow phenology metrics.

## How to cite this package in your article

You can cite this package like this "we obtained data from SNOTEL using the `snotelr` R package (Hufkens 2022)". Here is the full bibliographic reference to include in your reference list:

> Hufkens, K. (2022). snotelr: a toolbox to facilitate easy SNOTEL data exploration and downloads in R. Zenodo. https://doi.org/10.5281/zenodo.7012728.

## Installation

### stable release

To install the current stable release use a CRAN repository:

```r
install.packages("snotelr")
library("snotelr")
```

The use of the GUI requires the installation of additional packages, which are side loaded.

```r
install.packages(c("DT","shinydashboard", "plotly", "leaflet"))
```

### development release

To install the development releases of the package run the following
commands:

```r
if(!require(remotes)){install.packages("remotes")}
remotes::install_github("bluegreen-labs/snotelr")
library("snotelr")
```

Vignettes are not rendered by default, if you want to include additional
documentation please use:

```r
if(!require(remotes)){install.packages("remotes")}
remotes::install_github("bluegreen-labs/snotelr", build_vignettes = TRUE)
library("snotelr")
```

## Use

Most people will prefer the GUI to explore data on the fly. To envoke the GUI use the following command:

```r
library(snotelr)
snotel_explorer()
```

This will start a shiny application with an R backend in your default browser. The first window will display all site locations, and allows for subsetting of the data based upon state or a bounding box. The bounding box can be selected by clicking top-left and bottom-right.

![map](https://github.com/bluegreen-labs/snotelr/assets/1354258/f191081c-d5e9-4827-9cee-3e25376fc97c)

The *plot data* tab allows for interactive viewing of the soil water equivalent (SWE) data together with a covariate (temperature, precipitation). The SWE time series will also mark snow phenology statistics, mainly the day of:

- first snow melt
- a continuous snow free season (last snow melt)
- first snow accumulation (first snow deposited)
- continuous snow accumulation (permanent snow cover)
- seasonal maximum SWE (and its amount)

All values are provided as relative to January first of the year mentioned (spring), and absolute dates.

![time_series](https://github.com/bluegreen-labs/snotelr/assets/1354258/c430abbc-b714-45e1-8e31-0fdecb7d3796)

To access the full list of SNOTEL sites and associated meta-data use the **snotel_info()** function.

```r
# returns the site info as snotel_metadata.txt in the current working directory
snotel_info(path = ".")

# export to data frame
meta-data <- snotel_info(path = NULL)

# show some lines of the data frame
head(meta-data)
```

To query data for e.g. site 924 as shown in the image above use:

```r
snotel_download(site_id = 924)
```

For in depth analysis the statistics in the GUI can be retrieved using the **snotel_phenology()** function

```r
# with df a SNOTEL file or data frame in your R workspace
snotel_phenology(df)
```

# References

Hufkens, K. (2022). snotelr: a toolbox to facilitate easy SNOTEL data exploration and downloads in R. Zenodo. https://doi.org/10.5281/zenodo.7012728.

# Acknowledgements

This project was in part supported by the National Science Foundation’s Macro-system Biology Program (award EF-1065029) and the Marie Skłodowska-Curie Action (H2020 grant 797668). Logo design elements are taken from the FontAwesome library according to [these terms](https://fontawesome.com/license), where the globe element was inverted and intersected.