All posts by David

My First XAML Tips for the Universal Windows Platform

I’m a latecomer to Microsoft’s user interface technologies. I never used Windows Framework (WPF) on top of .net and I never used Silverlight on the web. The last year was my first taste of these tools through the XAML framework that is part of the “Universal Windows Platform” (UWP) – that is, the Windows 10 user interface layer (and Win8).

XAML has steadily evolved since the WPF days, and it took a little while to really understand the different major eras of the technology, especially since the UWP flavour of XAML strips out some of the older syntaxes in the name of efficiency on mobile platforms, better error checking at compile-time and code readability and ease-of-use. The technology’s old enough that much of the Google search hits and StackOverflow results are not applicable on the modern UWP platform.

My Tips

So what were a few of my first lessons when using XAML on UWP?

Continue reading My First XAML Tips for the Universal Windows Platform

From Data Science & Transportation to Software

As of early September, I’ve shifted to a new job in software development / 3D graphics with Mental Canvas. This comes after eight years as a data scientist / transport modeller at Metrolinx. I’m very excited to take on this new position, and I’m particularly keen to shift to a job where the product is working software instead of analysis and advice.

While the transportation modellers I’ve talked understand the close relationship between software and modelling, for others in transportation this seems like a drastic shift in direction. It’s not; the two jobs have quite a bit in common, and I’d like to explain the shared ground. To me, there are three basic stories here:

  • Similar Data: both transportation and graphics have a lot of similarly structured data. Both jobs involve a lot of time organizing, structuring and automating the flow of data.
  • Data Science & Software: a software person would use the term “data science” to describe transport modelling; it’s a hybrid of software and statistics, applied to the problems in the transportation field. Data Science and Software Development are closely related career paths.
  • Software and Transportation are Converging: or perhaps more boldly, software is in the early stages of disrupting the transportation sector.

Continue reading From Data Science & Transportation to Software

Communicating Visually, Using Data

Picture1I’ve long been a fan of data visualization, dating back to my days in the Imager lab at UBC, which had a research area in that subject. I’ve realized that my approach to “telling stories visually with data” includes a lot of knowledge that isn’t common in the transportation world, and I decided share what I know.

Drawing from the Internet, here’s a basic collection of content that gives a good introduction to how to communicate visually, using data. It’s even more compelling if you have my running commentary alongside… batteries not included.

  1. Telling Compelling Stories with Numbers
  2. Graphical Integrity
    • Edward Tufte slides (selected slides; original here)
  3. The Human Visual System
  4. Colour
  5. Tabular data
  6. Maps
  7. Closing Thoughts & References
    • Examples
    • Tufte, “Graphical Displays Should…” & Pantoliano
    • Tufte, “Principles of Graphical Excellence”
    • Kelleher & Wagener – Ten Guidelines

I haven’t covered one area in here: the basic principles of graphic design. But these are more widely known and can be learned in normal courses.

Scrums outside the Software world

Scrumboard picture The agile process (or “scrum”) is very successful in the software world, but little known outside. My team has been doing scrums at a transit agency for 3-4 years, and I get asked about it regularly. I’ve assembled a few links that are useful for explaining it without being too jargony or software-specific.

I’ll talk more about:

  1. Visual Management
  2. Agile Product Development
  3. Scrum Process

Continue reading Scrums outside the Software world

Toronto transit map updated

A very quick update – I’ve finally updated my Toronto transit map to use more recent map information. As of March 2016, the maps now show data from roughly Dec. 2015 for all GTHA transit systems. (I hadn’t had time to update them since originally building the map in 2011.)

The main visible change is that the TTC map is now simpler and shows route frequency with the thickness of the lines. Unfortunately, I may have difficulty updating the TTC map going into the future – as of 2016, their map is now more “conceptual” and is not geographically accurate; I can’t readily warp it to sit on a geographically-accurate map.

Federal Transit Administration (FTA) forecasting workshops

Many years ago, I found an excellent resource for transit modelling: slides from a series of 2006-2009 workshops held by the US Federal Transit Administration (FTA) advising agencies applying for federal funding for rapid transit construction under the “New Starts” funding program. It’s very deeply buried on their website, and since then I’ve seen very few people reference this material, nor have I seen it assembled into a formal report.

So, for those interested – I’ve pulled together an easier-to-use table of contents to the three separate workshops, and tried to “deep link” into them to make it easier to browse and find the material. Enjoy!

UPDATE April 2016 – FTA has reorganized their website and the reports are no longer available there. I’ve mirrored everything here on my website.
Continue reading Federal Transit Administration (FTA) forecasting workshops

Consistency in Time Weights

Modellers all learn about the different components of transit trip travel time, and the “perceived” weights that people put on them. It’s a useful insight into how transit works, and I find it’s a great exercise for testing how “useful” a new transit service is. The trouble is, after learning about weights, everyone wants to customize them – for their economic analysis, for one component of their model, etc.  And analysis quickly gets inconsistent. Here’s why I think that’s often a bad idea – and why I think the weights used in transit assignment should be applied, unchanged, for all other parts of analysis.  (And it’s not just me – the US Federal Transit Administration made this exact point in a 2006 discussion.)

The scenario

Suppose that we have a four-stage model with different transit time weights: Continue reading Consistency in Time Weights

Jarrett Walker’s “Transit Network Design” course

walkerMy employer recently hired Jarrett Walker to run his Transit Network Design course. I’m a long-standing fan of Jarrett’s work and regularly recommend his Human Transit book to colleagues.

I quite enjoyed the course, and it triggered thinking in three main areas for me:

  • Pulses / Timed Transfer Hubs for low-density areas
  • Completing the Grid using capital investment
  • Designing for Coverage vs. Ridership on a single corridor: local-vs-rapid stop pattern

The course revolves around group “build a network” games, and those games will clearly play out differently depending on the attendance.  Our course included several staff who work on bus scheduling, several who work on rapid transit planning, and many in areas further afield.  That meant that each group had several experienced and numerically savvy staff, who could quickly get up and running with headways, frequencies and cost unit rates, without any tutorial. Continue reading Jarrett Walker’s “Transit Network Design” course

Organizational Patterns

coverWhat makes a big organization work well?

Prior to my current job, my full-time working life was mostly in smaller companies. But working in a big company is a very different beast – making many teams and divisions move together is quite a task.

Some time ago, a friend pointed me to an interesting Wiki discussion on project management ideas. I followed a few threads there and stumbled on a fascinating book: Organizational Patterns of Agile Software Development by Coplien & Harrison.

It’s essentially a collection of ideas for improving organizations: building, healing, repair and growth. It’s written in a straightforward, browseable format: “if you have this problem, try this idea to fix it.” The book’s written for the software industry, but I feel most of the ideas are applicable in a wide range of fields.

Reading the book, what did I take away? Continue reading Organizational Patterns

Transit Map Mashup (Tech Talk)

GTHA Transit MapA few years ago, I built a Google Maps app that combined the maps from several Toronto transit agencies all in one mashup map. I never got around to discussing the technical issues associated with that effort, and thought it might be worth writing up. This is an extra-technical post, covering the GIS / raster graphics / GDAL programming techniques I used to make the mashup work, for anyone else interested in trying a similar exercise. Continue reading Transit Map Mashup (Tech Talk)