FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
Query to produce a series of rings using buffers:
generate_series with the number of rings you want to producelag function to remove for every ring the previous one so you get the ring
| # Download latest archlinux bootstrap package, see https://www.archlinux.org/download/ | |
| wget 'ftp://ftp.nluug.nl/pub/os/Linux/distr/archlinux/iso/latest/archlinux-bootstrap-*-x86_64.tar.gz' | |
| # Make sure you'll have enough entropy for pacman-key later. | |
| apt-get install haveged | |
| # Install the arch bootstrap image in a tmpfs. | |
| mount -t tmpfs none /mnt | |
| cd /mnt | |
| tar xvf ~/archlinux-bootstrap-*-x86_64.tar.gz --strip-components=1 |
This is a collection of information on PostgreSQL and PostGIS for what I tend to use most often.
| // See also: http://www.aaronland.info/weblog/2014/09/22/desire/#upload | |
| function upload_init(){ | |
| $("#upload-form").submit(function(){ | |
| try { | |
| var photos = $("#photo"); | |
| var files = photos = photos[0].files; |
| import os | |
| import urllib | |
| import urllib2 | |
| import base64 | |
| import json | |
| import sys | |
| import argparse | |
| try: | |
| import requests | |
| except ImportError: |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' /> | |
| <style> | |
| body { margin:0; padding:0; } | |
| #map { position:absolute; top:0; bottom:0; width:100%; } | |
| .marker-properties { | |
| border-collapse:collapse; |
