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orthomap <- function(lon, lat) {
  g <- as_s2_geography(TRUE)
  co <- s2_data_countries()
  oc <- s2_difference(g, s2_union_agg(co)) # oceans
  co <- s2_difference(co, s2_union_agg(oc)) # land
  
  # visible half
  b <- s2_buffer_cells(as_s2_geography(paste0("POINT(", lon, " ", lat,")")),
                       distance = 9800000)

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# code from https://gist.github.com/d-qn/4f1c4ed80a4fd6a76cd1153c89f56134

library(tidyverse)
library(sf)
library(osmdata) # to get openstreetmap geo data

# settings
# olivier: get data on Montpellier
bb <- getbb('Montpellier, France') # define the bbox, will be used to fetch OSM data within that box
dest_proj <- 2056

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Tips for Kobo Reader

Use the software Calibre to manager and transfer epubs.

Add Book Cover on Screensaver

1. On a PC:

nano .kobo/affiliate.conf

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Setup Ubuntu 22.04 on Lenovo X1 Carbon 7th Gen

SYSTEM SECURITY

Update System

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## Switch to Admin

su -



## Remove GRUB Menu

cd /etc/default
cp grub grub-OLD

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PostgreSQL Command Lines

$ brew install postgresql                                     # Install PostgreSQL

$ /usr/local/opt/postgres/bin/createuser -s postgres          # Create postgres role
$ psql -U postgres                                            # Connect to PostgreSQL
postgres=# \password postgres                                 # Set/change password for postgres

$ brew services start postgresql # Start PostgreSQL server

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Setting up OpenVPN under Unix

This tutorial shows the installation and configuration of OpenVPN on both macOS and Ubuntu.

1. Preamble (macOS only)

The easiest way to install OpenVPN on macOS is by using the package manager for macOS Homebrew. But first, you need to install the Xcode Command Line Tools for macOS.

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### [.] ALWAYS OPEN CHROMIUM IN PRIVATE MODE
###-----------------------------------------

# N.B. | First install { AdBlock }, { Adblock Plus } and { Adblock for Youtube } extensions and 
#      | Allow them to be run in private mode

$ defaults write org.chromium.Chromium IncognitoModeAvailability -integer 2 # / 0
$ defaults write com.brave.Browser IncognitoModeAvailability -integer 2

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#!/bin/sh

# chmod a+x ./macos-settings.sh
# sh ./macos-settings.sh



## [.] Install Command Line Tools ----

sudo xcode-select --install

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## General Options ----

options(prompt = "> ", continue = "... ", width = 80, scipen = 100, warn = 0,
        editor = "Atom", tab.width = 2)


## Graphical Device Dimensions ----

grDevices::quartz.options(width = 6, height = 6)