rOpenSci package or resource used
What did you do?
I used rtweet to extract the images and body text (containing coordinates) from tweets by @londonmapbot, a bot that tweets satellite images of random parts of London (disclaimer: I made the bot). Then I used magick to simplify each image to a single colour and extract its hex value. I used this information to create some visualisations of ’the colour of London'.
Functions used: rtweet::get_timeline(), magick::image_read(), magick::image_crop(), magick::image_quantize(), magick::image_resize() and magick::image_data().
URL or code snippet for your use case
I wrote a blog post, What colour is London?, which contains the code and some visualisations.
Image
The image below shows 625 randomised points over a map of the outline of Greater London. Each point is a location sampled by the londonmapbot twitter bot, which tweeted a satellite image for those coordinates. I scraped the image and latitude-longitude data with {rwteet} and reduced the image to a representative colour with {magick}. The colours are largely different shades of browns, greys and greens.
The image below shows a 25 by 25 pixel grid, where each square is one of the locations sampled by londonmapbot that’s been scraped with {rwteet} and reduced to a representative colour with {magick}. The pixels are ordered from top-left to bottom-right by luminosity.
Sector
Personal.
Field(s) of application
Geospatial; image analysis; Twitter bots.