Web mapping with Leaflet and R

Leaflet is a JavaScript library that has become quite popular for creating interactive maps. One way to create a map using the Leaflet JS library is to include the Leaflet JS and CSS files in the head of a web page and then set up the map in the body of the html page.

An alternative way is to create the web map in the R environment using an R package called leaflet, developed by the guys from RStudio, which allows controlling and integrating Leaflet maps in R. In this post I explain how to read into R a vector map in shapefile format and create a leaflet web map customizing how the vector map is displayed. I also show how to add a legend, a layers control and popups for displaying attribute data.

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TOC Shiny web app

This R Shiny web application allows the construction of the Receiver (aka Relative) Operating Characteristic (ROC) curve and the Total Operating Characteristic (TOC) curve for spatial and non-spatial data through a graphical user interface. The ROC curve is a widely-popular statistical technique used for evaluating the performance of a binary classifier system as its discrimination threshold is varied. The TOC method is a novel modification of the ROC method that has been introduced recently by Professor Pontius from Clark University.

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Optimal spatial sampling networks

This book chapter shows how optimal spatial networks for second-phase sampling of soil organic carbon were designed based on the spatial information obtained during a first-phase sampling. Additional points supplementing the existing initial sampling set were allocated in random and regular configurations following two different approaches: sequential and simultaneous addition. The search for the optimal set of additional points was performed using an evolutionary optimization technique known as genetic algorithms.

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