vis4.net | Visual Interaction Development in Flash, HTML5 and Processing
Here are my ideas for the next version of Piwik Maps. The map has altogether four views: world, continent[1. Some continents are divided into serveral regions for better zooming performance] and two new country views for provinces and cities. In both country views there is one active country. All other countries ...
If you're using Piwik, the open source web analytics tool, then you probably already missed a map visualization of your visitors location, which is a standard feature of all major web analytics tools. As I really like the idea of ...
Simplification is a common task in vector-based map visualization. In some situations you don't want to display a map in its full resolution for reasons like the overall filesize and the rendering time. One major class of simplification algorithms works by removing some vertices without moving the remaining ones. While there are already some good tutorials for implementation of line simplification algorithms online[1. for instance the Douglas Peuker Line Generalization or Lang Simplification and McMaster's Slide Averaging Algorithm], none of them takes into account the special requirements of map data simplifications. This gap will be closed by this post.
Many people are talking about html5 and the death of Flash in these days, so I decided to do a small speed comparison of map renderings between HTML5 and Flash. I took the quick and dirty example from my previous map rendering tutorial and ported it into html5/javascript. The ...
This tutorial is the second part of a tutorial series about customized map projection in flash/actionscript. It shows how to import a shapefile into ActionScript via the SHP library by Edwin van Rijkom.
This tutorial is the first part of a tutorial series about customized map projection in flash/actionscript. It shows how to extract plain coordinates out of a shapefile using the PHP Class Shapefile Reader by Juan Carlos Gonzales.
Today I want to introduce as3-proj, an actionscript port of the java map projection library by Jerry Huxtable, which is itself an partial port of the PROJ.4 library. It's basically a huge set of over sixty ...
[caption id="attachment_1013" align="aligncenter" width="650" caption="World Map of Internet Adresses (cutout)"][/caption] This visualizations shows the geographic location of 1,139,441,531 ip adresses. The locations are grouped by city, divided into four categories according to the total number of ip adresses belonging to a city. ...
Update: I strongly recommend the use of as3-proj instead, which includes far more map projections and lots of other features. Something you definitely need if you're planning to create some geospatial visualizations from scratch is map projection. Map projection means the conversion of sphere coordinates (basically pairs of latitude and longitude values) to 2D-screen coordinates. While this is very easy for smaller regions like single countries things are getting complicated if you want to display the whole world.
There's some kind of hype around climate data these days. Since the UK’s National Weather Service recently published an enormous set of weather station data files there's a growing number of visualizations spreading the net. Among a few other examples I found this very nice and clear ...
View Visualization and interpretation of weather station data
The last days I worked on a visualization experiment that shows the geographic locations of blog page requests on a world map. Furthermore, the visualization should be animated over time, so one can replay past events or just view the current live data. The last thing I added was an ...
I just made a corrected version of the previosly mentioned visualization using ActionScript. I tried a few map projections and decided to use the Winkel III projection which has a few advantages over the Mercator projection. One of them is the accaptable area distortion of countries near the ...
Yesterday I read an interesting article in the "AI Journal", which is the german news journal of amnesty international. It was about how many people in the world having internet access and how some governments and companies are censoring internet content. Thereby I saw this map: [caption id="attachment_776" align="aligncenter" ...
In Anlehnung an das Einführungsbeispiel aus Ben Fry's schönem Buch Visualizing Data habe ich gerade eine kleine Visualisierung der deutschen Postleitzahlen gebastelt. Sobald der Flashfilm den Keyboardfokus hat, kann eine Postleitzahl eingegeben werden. Der zugehörige Bereich färbt sich rot. Als Datenquelle wurde die OpenGeoDB eingesetzt. Update: Mit der Taste ...
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