PTV Visum Tips & Tricks
Integrate isolated stops into the network
You imported public transport stop points, but these stop points are isolated (means that they are not on links or nodes). How can I automatically assign the stop points to links or nodes?
One approach is to use the function “Aggregate isolated nodes” (Network -> Nodes -> Right click to open the context menu). The function offers options that nodes with a stop split links or a are placed onto links.
Depending on your task you might also want to use the interface “PuT supply from Visum” which allows you to transfer all PuT network elements into another model file. You will find this function following File -> Import -> PuT supply from PTV Visum. Watch the video for this feature.
Catchment areas, accessibility of places in the network
Accessibility is an important factor in traffic planning. PTV Visum can graphically represent how accessible places in the network are, how large the catchment area for stops and lines is, for example, and what proportion of the inhabitants are connected to the traffic network, and how well.
In the following, we will present five display options for accessibility:
- Stop catchment areas
Using stop catchment areas, you can illustrate the PuT access quality in the network. The layer 'Stop catchment areas' can be selected in the graphic parameters. Here, either a fixed radius or a selected attribute for the radius around the stop area can be indicated.(See Figure 1)
Based on one or several selected network objects, isochrones visualize the accessibility of all other network objects. Accessibility can be classified in intervals that are displayed in the network editor with different colours. Here is a PrT example, which displays the time in the loaded network with a smooth colour transition based on a node. (See Figure 2)
- "Intersection" GIS functionality
In Visum, you can intersect any network objects of the type point, line, or polygon that overlap spatially. For example, if the number of inhabitants in zones is intersected with stop points with a circular area (buffer with radius), the proportion of inhabitants who have a specific distance to stop points is shown. (See Figure 3)
- Isochrones and intersections
Isochrones are only displayed graphically and no network elements. The add-in "2D-Isochrone -> POI" can be used to change isochrones into network elements to enable their intersection as area objects with other network objects. (See Figure 4)
- Intersection of line routes and zones
Line routes can be intersected with attributes of zone areas by setting a buffer size around the line route, but this cannot be visualized Such line buffers can also be created as POI areas with the Visum add-in "Buffers around PuT lines" and in this way be graphically displayed and intersected.
- Stop catchment areas
Data export to MS Excel: storing correct numerical values
When exporting or copying to Excel (by file or clipboard, of lists or matrices) number formats or number values are sometimes changed. Why?
This might be related to the setting for the decimal symbol as point or comma, which needs to be equal for both Visum and Excel:
- Excel can use the corresponding Windows setting: Control panel -> Regional and Language -> Format -> Additional settings/Customize -> "Decimal symbol" and "Digit grouping symbol".
- Excel 2010 can override this option: Excel Options -> Advanced -> Use system separators -> "Decimal separator" and "Thousands separator".
In Visum this is a program setting:
- Visum 10-12: Extras -> Options -> Formats -> Decimal separator.
- Visum 13-2020: Edit -> User Preferences -> Formats -> …. Decimal separator.
Displaying flow bundles as link flow shares
How can I display a flow bundle as a percentage of link flows?
- Use a user defined attribute of type "Formula", calculated as: VolFlowBundle(PrT) / VolVehPrT(AP). (Figure 1)
- The respective link bar is set to be displayed with the format "Percent": Edit graphic parameters -> Links -> Bars -> Display -> Edit bar ... -> Label -> Format = Percent (Figure 2)
- To respect proportionality, display the flow bundle as bar (but without label: "Show Value/Unit/Title" off), and the user defined attribute only as label (without bar: ScaleMaxWidth = 0). (Figure 3)
The result is displayed in Figure 4.
Editing the polygon of area objects
PTV Visum uses area objects for zones, territories, POIs, main nodes, main zones and toll systems, and offers a comfortable editor for their closed polygons. Are you sure to know all really helpful features available? Check the pdf: Editing the polygon of area objects