Digital Geography

The Coup in Turkey: the Twitter Perspective

The coup/attempt in Turkey kept me up from going to sleep after the two nice hours of “Back to the Future” on German television. So despite of the tragedy behind it: twitter was exploding as I watched the news coming in. I was interested in the timeline of tweets, locations and “everything”. I downloaded about 10Gb of twitter data and here is my analysis for everything ‘#turkey’ from Friday till Monday.

Spatial Big-Data: 10 stunning services

In the last month the German website Spiegel-Online showed some nice examples of big-data combined with geodata. Geodata get’s more important with every GPS-enabled device that is sold, form that will store your address, IP that is monitored, customer in a global market. Let me Introduce you some stunning examples of geo-enabled web applications. Maybe you get some inspiration to power your business with some spatial data too.

D3: My First Webmap

I always watched those stunning examples created with D3 by Mike Bostock, I liked Ralf’s blog posts here and I always thought to myself: get yourself together and create one for your own. But to say it straight: I haven’t figured it out… But yesterday I stumbled upon this nice, not so short post of MappingGIS.com and I would like to share my learning process here. So let’s start …

D3 Geodata Basics – A Map Overlay can have many Faces

Within that tutorial I will show you how to: add a geoJSON file using pure Leaflet open a geoJSON file with D3 open a TopoJSON file with D3 add a map-overlay to a leaflet map using D3 Again…we begin with a simple map … already seen in D3 mapping basics and in geoJSON & Leaflet Add a geoJSON file using pure Leaflet You should know how to do this! Just add some very simple data to the map, as we have already done it in a previous post! Import the data file… …add the data to the map… …define the…

D3 Mapping Basics

Within this, 2nd basic D3 tutorial, I will show you how to combine D3 with Leaflet whereby each library can demonstrate its vantages! These will be the main topics: Set up a map using Leaflet Add an individual zoombar Show the center of the map Show the extent of the map Get a 1st impression of d3.scale() When you are not familiar with D3 or Leaflet I recommend you to apply these tutorials, previously: D3 Basics geoJSON & Leaflet Set up a map using Leaflet Let’s begin by setting up an html-file containing a very simple map. How this can…

D3-Basics – All you need is a selection!

Since a while I am programming with the JavaScript library D3.js … and … I am addicted to it! As I would like to present some tutorials on D3’s fantastic possibilities to create and design webmapping solutions … I think it would be good to give you a description on the things that I would identify as elementary. Caution! This tutorial could be a little bit too detailled for you, when you are a skilled JavaScript programmer! I am sorry for that! But when you are a noob in JavaScript, as I was when I began to program with D3,…