Creating Multiple Concentric Ring Buffers in PostGIS

Whenever possible I recently try to get all my GIS work done in QGIS. Most of the time this is no problem at all. Sometimes it makes things even easier, such as when you’re trying to work with your geospatial data in a PostgreSQL/PostGIS database (good luck trying that in ArcGIS!). But sometimes you come across a task that is just so exotic that nobody has ever come across it. Or at least nobody wrote about coming across it…

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Upcoming Event: 2014 Annual Meeting of the Association of American Geographers (AAG)

Readers of my blog know that I have been attending the Annual Meeting of the Association of American Geographers (AAG) for the past two years. While these meetings took place in some of the largest and most international cities in the USA (New York in 2012 and Los Angeles in 2013), the AAG decided to hold the 2014 meeting in Tampa, FL. There’s nothing wrong with this – I love Florida and it should be nice and warm there in early April – but I can’t help but be a little afraid that the city will be more or less overrun by geographers over the course of the conference week. Also, there seem to be mostly two types of accommodation in Tampa: either luxury hotels that break my budget (even at the “discounted conference rate” of USD 199 per night in select hotels) or shady motels far away from the conference venue…

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GIS & Spatial Analysis – “My” magazine on FlipBoard

I have been maintaining it for quite a while now, but it was only today that I found out that it can also be accessed outside its native app on the web: “my” magazine on FlipBoard.

GIS & Spatial Analysis - Flipboard

I called it GIS & Spatial Analysis, and that’s exactly what its contents is all about: I “flip” (that’s the FlipBoard lingo for sharing) everything in here I deem interesting and newsworthy from the world of digital maps, spatial data and spatial analysis. Sometimes it’s rather scientific contents, sometimes it’s just interesting or even going to make you smile. If you’re a map and GIS geek like me, that is…

Obviously it’s for free – so go ahead enjoy! The native app is available for iPad, iPhone, Android, Kindle Fire and NOOK – also for free.

IGU2013: Spatial Methodologies for the Analysis of Vulnerability in Urban Areas ー A Case Study for Terrorism in Tokyo, Japan

On August 8, 2013, I gave another presentation at this year’s IGU Regional Conference in Kyoto. There, I spoke about my ongoing research about the use of spatial methodologies in the analysis of vulnerability in highly urbanized areas. The slide deck below also contains a case study about terrorism vulnerability in Tokyo, Japan.

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IGU2013: Spatio-Temporal Analysis of Bicycle Commuting Behavior in the Greater Tokyo Area Using a Micro-Scale Persontrip Database

I just finished my first presentation of the 2013 IGU Regional Conference in Kyoto. In this presentation, co-authored by my academic advisor Prof. Yuji Murayama from the Division for Spatial Information Science at the University of Tsukuba, I talked about some very early findings of one of our most recent research projects analyzing the use of bicycles in the Tokyo Metropolitan Area. We are especially interested if and how the use of bicycles is integrated in routine commuting activities. We are doing this by analyzing a large-scale database of persontrip information.

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