Jacques Tardie jqtrde

Start querying (also scroll down for more query examples!)

Freebase: http://www.freebase.com/query
DBPedia: http://dbpedia.org/snorql
- Scroll for dbpedia examples: https://wiki.base22.com/display/btg/SPARQL+Query+Examples
Factforge: http://factforge.net/sparql

Wikipedia stats

http://en.wikipedia.org/wiki/Wikipedia:Wikipedians

Bitcoin Full Node on AWS Free Tier

Provisioning

Launch one T2 micro instance, using Ubuntu 14.04 LTS AMI.
Open SSH and Bitcoin Protocol TCP ports: 22, 8333.
Attach 40GB EBS (General-Purpose SSD) volume for blockchain storage to /dev/sdf.

The pricing should be ~3$ for the first year (assuming 30GB upload per month). See here for more details.

Processing LiDAR to extract building heights

Walk through

Detailed walk through of building extraction using postgis

First lets pull a data layer from of openstreetmap. You can do this any which way you’d like, as there are a variety of methods for pulling openstreetmap data from their database. Check the [wiki] (http://wiki.openstreetmap.org/wiki/Downloading_data) for a comprehensive list. My favourite method thus far is pulling the data straight into QGIS using the open layers plugin. For those who may want to explore this method, check [this tutorial] (http://www.qgistutorials.com/en/docs/downloading_osm_data.html). For building extraction you only need building footprints, and include the building tags. Not all polygons are of type building in OSM, so we can download all the polygons, and then filter the layer for only polygons tagged as buildings.

LiDAR data was pulled from USGS via the Earth Explorer site. [Here] (http://earthobservatory.nasa.gov/blogs/ele

Getting Started

I recently made my first map with MapBox's new WebGL+JavaScript API. There aren't many examples of how to do this yet, even on MapBox's API page, so I'll document my own experience here.

The Van Gogh Map

My map is made of several textures taken from Van Gogh paintings. The long-term goal is to allow a user to select which artworks they want to take textures from, but for now there is just one setting.

	#######################################################################
	###BASH FOR PROCESSING LANDSAT 8 (8-BIT CONVERSION NEEDED AND INCLUDED)
	########################################################################

	###MAKE SURE IMAGERY ZIP FILE IS IN L8_IMAGERY FOLDER ON DESKTOP

	###THIS SPECIFIC COLOR TWEAKING WAS DESIGNED FOR BAIJI IRAQ AND THEREFORE
	###WILL BEST FIT DESERT REGIONS!

	Folder="Baiji_Jun18"

	# https://www.mapbox.com/blog/processing-landsat-8/
	task :landsat_2014 => :environment do
	dirs = Dir["#{Rails.root.to_s}/db/initial/raster/*"].reject {\|q\| q =~ /tar\.gz/ }
	dirs.each do \|dir\|
	scene_id = dir.split("/")[-1]
	[4,3,2].each do \|band\|
	`gdalwarp -t_srs EPSG:3857 #{dir}/#{scene_id}_B#{band}.TIF #{dir}/#{scene_id}_B#{band}-projected.tif`
	end
	`convert -combine #{dir}/#{scene_id}_B{4,3,2}-projected.tif #{dir}/#{scene_id}_RGB-projected.tif && \
	convert -channel B -gamma 0.925 -channel R -gamma 1.03 -channel RGB -sigmoidal-contrast 50x16% #{dir}/#{scene_id}_RGB-projected.tif #{dir}/#{scene_id}_RGB-projected-corrected.tif && \

	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	svg{
	background:#2379d5;
	}

	.texto{
	font-size:13px;
	}

	request (49)
	underscore (36)
	glob (20)
	once (19)
	lru-cache (15)
	optimist (14)
	async (14)
	minimatch (14)
	lodash (13)
	node-uuid (13)

	L.tileLayer.fancyCanvas = function(url){
	var layer = L.tileLayer.canvas({async: true});
	layer.setUrl(url);

	var dataSource = function(x, y, z, done){
	var url = layer.getTileUrl({x: x, y: y, z: z});
	d3.xhr(url).responseType('arraybuffer').get(done);
	};
	layer.data = function(fn){
	dataSource = fn;

	FROM debian:7

	ENV DEBIAN_FRONTEND noninteractive

	RUN apt-get -qq update \
	&& apt-get -qq -y --no-install-recommends install \
	autoconf \
	automake \
	build-essential \
	curl \