Cartes et espaces
Figure 1 Overlapping territories of First Nations in the perception of their members. Screenshot from the geomatics site https://native-land.ca/ .
Unstable borders are a cartographer’s nightmare. The simple task of reporting on demographic changes quickly becomes a headache in a country whose municipalities merge, divide, and even change their spatial contours according to the projects of their inhabitants and councillors, […] Continue Reading…
Let us assume the existence of A and B, two points connected by a straight line which, if it extends beyond B, lets us imagine C, a point located anywhere on this imaginary line. C, then, can be said “in the continuity” of A and B. We’ll arrive at point C if we do not deviate. C will happen […] Continue Reading…
You will find no realistic landscapes prior to the Renaissance. The saints of medieval murals float in a conceptual space informed by hierarchies and symbolic relations; so do those of the Prajñāpāramitā Sūtras. The word “landscape” appears with the Dutch painters of the 15th century. A landscape is a part of the world perceived by a human being at […] Continue Reading…
Coding in R is useless without interesting research questions; and even the best questions remain unanswered without data. RStudio provides a number of convenient ways to acces data, among which the possibility to write SQL code chunks in Rmarkdown, to run these chunks and to assign the value of the query result directly to a variable of your choice. […] Continue Reading…
After achieving an optimized string detection algorithm in R for 1 milion phrases using a 200k large dictionary, I wondered if I can get better results in Julia. My first attempt at this was a catastrophe. Within 24 hours, the Julia community helped me to learn some basics of Julia code optimization and proposed a blazing fast translation of […] Continue Reading…
Ideograph is a visual tool for exploring ideologies of political parties. It queries its data directly from the frequently updated WikiData graph database. You can filter the graph by country, and find further information by clicking on the node labels.
Ideograph is licensed under GNU GPL 3.0.
Presentation Video
I’ve presented IdeoGraph at the Wikidata for Civil Tech session. Watch the 5 […] Continue Reading…
This one drove me crazy today! If you try to sum values from rasters with different extent, the raster calcultor clips the result to their overlapping zone. This might make sense in most cases, but in many other cases it absolutely does not. Users should have a choice.
An old workaround (2013) is proposed on a page called Raster extent […] Continue Reading…
Radar charts, also called spider charts, serve to compare profiles of individuals. They are most useful if every profile is compared to an average profile. They are most pertinent when the order of the axis has an inherent sense, such as cardinal directions, the surroundings of an individual (the level of noise from left, right, front, aft), antagonistic […] Continue Reading…
We’ve heared a lot about Wuhan (武汉), during 2020, for obvious reasons. Facts have a hard life on the battlefield of speculations, caught up in crossfire between pro-Trump propaganda channels (FoxNews, OANN, …) and Chinese state media. Scientists propose two hypotheses for the origin of the Covid-19:
A zoonotic transmission from animal to human, traced back to the Huanan sea […] Continue Reading…
Graphics of the evolution of the COVID-19 pandemic. Updated regularly since March 31st. Source code for graphic production included.
Excellent graphics of the evolution of the COVID-19 have been made by John Burn-Murdoch for the Financial Times or by Lisa Charlotte Rost for the Grand Continent (observatoire Coronavirus : tendances globales). Not only use they a logarithmic scale, but count […] Continue Reading…
