Follow moving particle trajectory over raster with {rayshader}

{rayshader} is a fantastic package for 3D mapping, but it comes with the limitations of {rgl}. I always found it a shame not being able to travel in all directions over my 3D objects. In this blog post, I will show a trick to simulate particle trajectory in 3 dimensions like in a “first person” …

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Create a twitter bot on a Raspberry Pi 3 using R

With Marion Louveaux, we decided that we had to build a Twitter bot for our preferred hashtag. We explored different possibilities but truth is I couldn’t resist building it using R and {rtweet}. Here are the steps I used to set up a Twitter bot on my Raspberry Pi. […] I use package {rtweet} …

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Keep a github/gitlab fork up-to-date

Developers in the R-community are open to any kind of help in the development of their packages. You can open issues but also propose some pull/merge requests to improve code and/or documentation. But once you have forked the main repository, how can you be sure to work on the last version of the …

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Render mesh3d objects with rayshader and rayrender

People like to show 3D images in their presentations because it usually impresses the audience. Does it really ? I do not care ! I am just looking for an opportunity to play with some 3D images… This blog post is a detailed version of some 3D images shown during my presentation “Everything but maps …

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Kaggle survey 2018: Maps of programming languages used and repartition of reproducibility issues

Last year I participated to the Kaggle survey data challenge. The challenge objective: tell a data story about a subset of the data science community represented in this survey, through a combination of both narrative text and data exploration. I used this opportunity to build ternary choropleth …

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Play with spatial tools on 3D cells images

Let’s play with mapping tools on non-maps data ! {rayshader} is nice on raster maps, but what about using it on segmentized plant cell? […] I wanted to find a good reason to play with Tyler Morgan-Wall packages for 3D visualisation of raster data: {rayshader} and {rayfocus}. Using cell …

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Introduction to mapping with {sf} & Co.

At the “Rencontres R 2018” in Rennes, I proposed a brief introduction to mapping using the recent {sf} package and some other interesting packages. This blog post is an extended version of my presentation allowing me to share the code of the different maps that appeared on it. It’s still a brief …

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Draw maps like paintings

On the Grrr Slack, a mutual-aid Slack on R for French speaking people, Thomas Vroylandt showed the following maps asking how this could be done using {ggplot2} : EDIT : This maps was originally presented on visionscarto.net with drawings by Agnès Stienne […] As of today (2018-04-18): …

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Spatial correlation between rasters

In this blog article, I propose a way to look at the spatial repartition of correlation between two rasters. For your own reason, you may want to know the correlation between rasters, but a unique value issued from fonction cor is not enough. You would like to know if there are variations of …

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Spatial interpolation on Earth as a 3D sphere

Earth map is usually presented flat. Geographical coordinates usually go from -180° to +180°. Spatial interpolations using coordinates may be tricky as -180° is equal to +180°. Here I propose a way to realize spatial interpolations on Earth as a sphere and then map the outputs in 3D using rgl. The …

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SDMSelect: Cross-validation model selection and species distribution mapping

This library has originally been created for covariates selection to predict species distribution (biomass, density or presence/absence). Its final aim is thus to produce maps of predicted distributions (Look at vignette SDM_Selection). However, the core of the library is a N-times k-fold …

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Polygons tint band with leaflet and simple feature (library sf)

Let’s use some French regions polygons and attribute one colour to each region. I like piratepal colours of library yarrr. […] To create the doughnuts using original and buffer polygons, I used st_difference. However as discussed with edzer in the sf github repository, I had to transform the …

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Rmarkdown conditional chunks to create multilingual pdf and html with images

In the upper output files, I list some of the tips I have to use to make this work and some bonus: […] I will modify this list if I face new difficulties or I find better ways to do things. […] The complete list of tips can be seen on the following web pages (embedded in iframes). Rmd …

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Rshiny expert image comparison app

The expert image comparison was long: 40min for the small analysis and 3h for the complete one. As the shinyapp is freely hosted on the Rstudio shinyapps.io servers, it was not possible to save outputs of a specific session on the server. Thus, the web application has been built such that the …

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A nice RShiny On/Off switch button

[…] This Rshiny ‘SwitchButton’ function allows to use nice on/off (or True/False) switch buttons instead of the default Rshiny ‘checkboxInput’ function. This only uses CSS code and does not make use of javascript. The ‘switchButton’ function includes two options: […] Steps to include …

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Bayesian life cycle model: OpenBUGS code

The OpenBUGS code presented below is the additional material of a publication. This is the life cycle model of a marine species (the sole in the Eastern Channel). The Bayesian hierarchical model incorporates indices of juvenile spatialized abundance, larval dispersion, adult abundance indices and …

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