This slide deck from FOSS4G 2016 originally only got my attention because of the truly awesome title, but it turns out Erik Escoffier has some tricks up his sleeve that I didn’t know. Worth a look if you’re frequently writing code that does geo stuff.
I just learned about Open Reblock from my students. Very cool project:
Reblocking is the process of physically transforming an informal settlement to provide an access path to all its structures. This project analyzes the spatial structure of informal city blocks, and uses an algorithm to suggest reblocking solutions that provide access to all structures within the block in a minimally disruptive way.
Abstract: As location-aware applications and location-based services continue to increase in popularity, data sources describing a range of dynamic processes occurring in near real-time over multiple spatial and temporal scales are becoming the norm. At the same time, existing frame- works useful for understanding these dynamic spatio-temporal data, such as time geography, are unable to scale to the high volume, velocity, and variety of these emerging data sources. In this paper, we introduce a com- putational framework that turns time geography into a scalable analysis tool that can handle large and rapidly changing datasets. The Hierar- chical Prism Tree (HPT) is a dynamic data structure for fast queries on spatio-temporal objects based on time geographic principles and theories, which takes advantage of recent advances in moving object databases and computer graphics. We demonstrate the utility of our proposed HPT us- ing two common time geography tasks (finding similar trajectories and mapping potential space-time interactions), taking advantage of open data on space-time vehicle emissions from the EnviroCar platform.
I knew that Uber drivers do not make a terrible lot of money, but this breakdown shows how bad the situation really is for them. If you factor in all costs, drivers are getting ripped off to the point where they are actually losing money when they drive for Uber. So much for the ethics of the self-proclaimed sharing economy.
I just hope the old school taxi cab companies will eventually get their act together and make it as easy to order a cab as Uber does.
Our proposal for the next (6th!) Linked Science workshop at ISWC has been accepted. Our theme this year is “Supporting collaboration and learning in e-research infrastructures” to help diminish the knowledge gap between technologists and those less tech-savvy. Here’s the gist of it, head over to linkedscience.org for the full announcement:
This film was made mining the Thomas Jefferson’s Grid in Google Earth. By superimposing a rectangular grid on the earth surface, a grid built from exact square miles, the spherical deviations have to be fixed. After all, the grid has only two dimensions. The north-south boundaries in the grid are on the lines of longitude, which converge to the north. The roads that follow these boundaries must dogleg every twenty-four miles to counter the diminishing distances: Grid Corrections
Interesting read about what can happen if you use a technology – IP addresses in this case – for something completely different than it was meant to:
For the last decade, Taylor and her renters have been visited by all kinds of mysterious trouble. They’ve been accused of being identity thieves, spammers, scammers and fraudsters. They’ve gotten visited by FBI agents, federal marshals, IRS collectors, ambulances searching for suicidal veterans, and police officers searching for runaway children. They’ve found people scrounging around in their barn. The renters have been doxxed, their names and addresses posted on the internet by vigilantes. Once, someone left a broken toilet in the driveway as a strange, indefinite threat.
The title is a little bit misleading – it’s not really a mapping glitch, but I can see how using IP-based geocoding in the title would turn most readers away without even reading the first sentence of the article.