Author: The USGS OWI blog

Introduction Choosing colors for a graphic is a bit like taking a trip down the rabbit hole, that is, it can take much longer than expected and be both fun...continue reading.

Finding the Location Furthest from Water in the Conterminous United States The idea for this post came a few months back when I received an email that started, “I am...continue reading.

Depending on how new you are to software development and/or R programming, you may have heard people mention version control, Git, or GitHub. Version control refers to the idea of...continue reading.

Introduction There are many different R packages for dealing with spatial data. The main distinctions between them involve the types of data they work with — raster or vector —...continue reading.

Boxplots are often used to show data distributions, and ggplot2 is often used to visualize data. A question that comes up is what exactly do the box plots represent? The...continue reading.

R can create almost any plot imaginable and as with most things in R if you don’t know where to start, try Google. The Introduction to R curriculum summarizes some...continue reading.

What we couldn’t cover In the data cleaning portion of our Intro to R class, we cover a variety of common data manipulation tasks. Most of these were achieved using...continue reading.

We queried more than 60 people who have taken the USGS Introduction to R class over the last two years to understand what other skills and techniques are desired, but...continue reading.

Introduction This document gives a brief introduction to making static and dynamic maps using inlmisc, an R package developed by researchers at the United States Geological Survey (USGS) Idaho National...continue reading.

Introduction This document describes how to produce a set of graphics and perform the associated statistical tests that describe trends in daily streamflow at a single streamgage. The trends depicted...continue reading.

What happened? A magnitude 8.1 earthquake was measured in the Pacific region offshore Chiapas, Mexico at 04:49:21 UTC on September 8th 2017. Working in the Water Mission Area for the...continue reading.

Introduction The Hydro Network-Linked Data Index (NLDI) is a system that can index data to NHDPlus V2 catchments and offers a search service to discover indexed information. Data linked to...continue reading.

A number of map services are offered through The National Map (TNM). There are no use restrictions on these services. However, map content is limited to the United States and...continue reading.

Introduction This document describes how to obtain seasonal information from the R package EGRET. For example, we might want to know the fraction of the load that takes place in...continue reading.

This post will show simple way to calculate moving averages, calculate historical-flow quantiles, and plot that information. The goal is to reproduce the graph at this link: PA Graph. The...continue reading.

Science is hard. Why make it harder? Scientists and researchers spend a lot of time on data preparation and analysis, and some of these analyses are quite computationally intensive. The...continue reading.

Introduction This script utilizes the new dataRetrieval package access to the USGS Statistics Web Service. We will be pulling daily mean data using the daily value service in readNWISdata, and...continue reading.

Introduction In this example, we will use the R programming language to access LOCA data via the OPeNDAP web service interface using the ncdf4 package then use the geoknife package...continue reading.

We are excited to use many of the JavaScript data visualizations in R using the htmlwidgets package in future blog posts. Having decided on using Hugo, one of our first...continue reading.

Marcus Beck (USEPA) Laura DeCicco (USGS-OWI) Introduction EGRET is an R-package for the analysis of long-term changes in water quality and streamflow, and includes the water-quality method Weighted Regressions on...continue reading.