I realize now that it has been well over a year since my last post, but I think I have a few good reasons: I moved to Australia (our hearts are still in the US, but we are living down under now) I completely re-factored AequilibraE, and it is now a much more robust and […]
I have been working with Raster files for a while (mainly CropsCape data), but I have migrated from GRASS GIS to Python a while ago and have not since looked back. Tools like Rasterio have made life much easier for Python programmers, but it is still hard for those who are not programmers to do […]
About a month ago I went to San Francisco Bay Area to present AequilibraE at the FOSS4G North America convention, which is the largest Open Source GIS event in the US. It is a very interesting conference, and much different from the transportation engineering/planning conferences I usually go to. The nice thing of being in […]
Back in January 2003 when I started my career in transportation planning as an intern at Logit, my main tools as far as software went were MS Excel and TransCad (sometimes Maptitude). I would do all the modeling in Excel/VBA and use Transcad for assignment and visualization, and would always rely heavily on the visualization […]
(WARNING: This has now been fully implemented in AequilibraE, a QGIS plugin for transportation modeling. Download it from the QGIS repository or access https://github.com/aequilibrae/aequilibrae) Since I first starting using TransCad (TCW 4.0 back in 2003) I always loved Desire Lines. It is easy and quick to obtain (as shown HERE) and it is one of […]
This is a non-conventional post, as it is just the presentation I gave at SHRP2 (Freight modeling group) last October in DC. It was a really good conference and I was very happy to be part of that. My presentation can be downloaded HERE, and below you can find my extended abstract. ABSTRACT When working […]
I already posted some stuff about CSFFM, and I still have a couple more to post (many more after TRB papers are submitted) and this time I’ll talk a bit about the network editing procedure we went over. We started to develop our network based on the previous version on the passenger model (from which […]
I already talked about CSFFM when I presented the seasonality analysis I made for agricultural products, but now the focus is on different parts of CSFFM. When working with freight modeling, often analyses use aggregate data like sector employment, GDP, number of firms and other statistics the Census provides. It becomes, then, an econometric exercise […]
Freight modeling is currently a very hot topic in the US, and California currently has its CSFFM being developed at UCI by a team to which I belong. First of all, there are two main streams of freight modeling. The first one has a more urban accent to it, and usually models truck movements, like […]