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Problems with nvidia driver 173 and kernel 3.2.0-52. Two monitors and card Quadro NVS 160M 24 Aug 2013 | 03:58 pm
After the recent kernel upgrade my old nvidia driver failed to load and X loads with a very low resolution and without detecting my second monitor. For my graphic card the nouveau driver is not an opt...
Java on iPhone or iPad 7 Aug 2013 | 01:50 pm
Dear Internet, what options do I have to make my Java application working on the iPhone? It should not be necessary to jailbreak the phone. Also UI is not necessary for now although e.g. codenameone ...
GraphHopper Maps – High Performance and Customizable Routing in Java 22 Jul 2013 | 05:36 pm
Today we’re proud to announce the first stable release of GraphHopper! After over a year of busy development we finally reached version 0.1! GraphHopper is a fast and Open Source road routing engine ...
Preparing GraphHopper for its first release … (#Java #OpenStreetMap #Graph) 2 Jul 2013 | 03:00 pm
I’ve not blogged since a while but we are pushing Java road routing via GraphHopper to its first public release 0.1! We’re not finished yet, but have a first look and give us feedback here or in the m...
Make Your Dijkstra Faster 4 Dec 2012 | 01:37 am
Today I stumbled over yet another minor trick which could speed up the execution of the Dijkstra algorithm. Let me shortly introduce this shortest path algorithm: If you need the path (and not only th...
Running Shortest-Path Algorithms on the German Road Network within a 1.5GB JVM 16 Jul 2012 | 04:50 pm
In one of my last blog posts I wrote about memory efficient ways of coding Java. My conclusion was not a bright one for Java: “This time the simplicity of C++ easily beats Java, because in Java you ne...
Failed Experiment: Memory Efficient Spatial Hashtable 18 Jun 2012 | 06:06 am
The Background of my Idea The idea is to use a hash table for points (aka HashMap in Java) and try to implement neighbor searches. First of all you’ll need to understand what a spatial key is. Here y...
How I found the Googloson and why it has negative Energy 18 Jun 2012 | 03:24 am
I have finally found the Googloson with my self-made Small Googtron Collidor (SGC) – I even had the time to make a photo of it to show you that it is not a fake (see below). Everyone will say I’ve gi...
Tricks to Speed up Neighbor Searches of Quadtrees. #geo #spatial #java 29 May 2012 | 09:55 pm
In Java land there are at least two quadtree implementations which are not yet optimal, so I though I’ll post some possibilities to tune them. Some of those possibilities are already implemented in my...
Spatial Keys – Memory Efficient Geohashes 23 May 2012 | 08:13 pm
When you are operating on geographical data you’ll use latitude and longitude to specify a location somewhere on earth. To look up some associated information or if you want to do neighborhood searche...
