digitizeR

WebPlotDigitizer powered R package for data extraction from images of plots, maps etc.

Install

This package is under heavy development, but uses a stable version of WebPlotDigitizer. If you want to give this a try, then follow these instructions:

1. If you don't already have devtools, then install using:

    install.packages("devtools")
   

2. Install digitizeR (Linux/Mac/Windows):

    devtools::install_github("ankitrohatgi/digitizeR")
   

Use

No real-time communication has been implemented at the moment, but you can launch and close WPD using the following:

Load library:

library('digitizeR')

Launch a local instance of WebPlotDigitizer:

app <- wpd_launch()

This starts a httpuv based server on your machine. This should also open the local URL in a browser window.

Close server instance:

wpd_close(app)

Change default server location and port:

app <- wpd_launch(location="192.168.1.100", port=8080) # for example

Goals

At the moment, this package only lets you start (and stop) WebPlotDigitizer, but eventually, I would like to add R functions that can communicate with the app in real-time (using WebSockets). A few examples of what is possible in the future are as follows:

ds <- wpd_getDatasets(app)                  # fetch all digitized data as a data frame.
wpd_loadImage(app, 'my_plot.jpg')           # load an image file programmatically.
wpd_loadPDF(app, 'thesis.pdf', page=5)      # load a specific page from a PDF file.
wpd_calibrate(app, 'calibration_data.json') # align the axes to pixels using some calibration data.

# and so on.

Contact

Ankit Rohatgi ankitrohatgi@hotmail.com