add vienna model from AIT

src/gallery/vienna.md

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+---
+title: "Vienna, Austria"
+thumbnail: /assets/images/gallery/vienna_thumb.jpg
+layout: scenario
+prio: 39
+---
+
+The Austrian Institute of Technology (AIT) has created a MATSim model 
+covering the city and agglomeration of Vienna (Austria).
+
+
+## The Model in a Nutshell
+
+- Aims to represent traffic *before* the COVID pandemic (~2020)
+- **Simulation Area:** Vienna and surroundings (between 40 and 80km away)
+  - area: 11,700 km²
+  - total population: 3.05 million (2013-01), 3.275 million (2020-01)
+- **Network**: 375k links and 169k nodes extracted from [OpenStreetMap](https://www.openstreetmap.org) (2021) and OGD transit timetables (VOR: Tuesday 2022-06-07, EVU: 2022-10-27) with [pt2matsim](https://github.com/matsim-org/pt2matsim)
+- **Facilities:** 654k locations extracted mainly from [OpenStreetMap](https://www.openstreetmap.org)
+- **Population synthesis**: based on the Austrian mobility survey *Österreich Unterwegs 2013/14* by Tomschy et al. (2016) with [ARUP PAM](https://github.com/arup-group/pam), scaled up to population of 2020
+- **Population**: 332k agents represent 12.5% of the mobile population older than 5 years.
+  - Agents use the MATSim modes walk, bike, pt, car, ride.
+  - Trips include inside, source, destination and through traffic (see cordon traffic)
+  - Traffic by foreign citizens is not included (except for cargo traffic)
+- **Cargo traffic**: represented as ~10% reduction in `flowCapacityFactor` and `storageCapacityFactor` and a reduction of all count stations.
+- **Routing**: SwissRailRaptor (not Ariadne)
+- **Mode choice model:** 10 subpopulations, based on Greene and Hensher (2003), plus an additional subpopulation for cordon trips.
+- **Calibration:** on modal split derived from synthesized population
+
+
+## Coverage Area
+
+![Area covered by the MATSim Model Vienna](/assets/images/gallery/vienna_area.jpg)
+
+Area covered by the MATSim Model Vienna, light-blue areas contain facilities.
+The area contains Vienna and large parts of Lower Austria as well as parts of Burgenland
+(including St. Pölten, Wiener Neustadt, Hollabrunn, Mistelbach,..)
+where people tend to commute to Vienna.
+
+## Open Data
+
+The model is available as open data along with more detailed information
+in a [github repository](https://github.com/ait-energy/matsim-model-vienna/).