This type of analysis is capable of calculating the trip distribution (both inbound and outbound) of all the trips on the consecutive road segments within 5 to 50 kilometers from the link selected by the user.
Date & Time Ranges
The first two steps of creating such a report are the same as in the case of a regular Origin/Destination analysis. These steps consist of selecting date ranges and time ranges that are going to be analyzed. You can learn more about it here:
Selecting A Link
The third step is a map view where it is possible to select the road segment (which we also call "link") that is used to calculate all the inbound and outbound trips.
To select the link, it is necessary to go to a specific location and zoom in to see the road network segments:
Before choosing a road segment to analyze, it is possible to adjust the map version of the visible segments network. By default, the tool is always selecting the version related to the analyzed date range used in the analysis, but it is always possible to change it if needed.
Changing the map version might be useful when comparing different analyses results in case there were some map geometry changes caused by local roadworks.
Once the road segment is selected, it will be highlighted and arrows should appear on the adjacent roads. The arrows are showing the direction of the trips and roads that are going to be analyzed.
In the case when the analyzed road is bi-directional and the user wants to analyze the opposite direction, it is possible to use the "Reverse" button to change it. If the road is one-directional, the button will be grayed out.
To help with more complicated use cases or when the user wants to analyze the trip distribution for a specific route, it is possible to select more road segments by just clicking them on the map.
The limit of all the selected road segments length in a single report is 2000 meters.
Important Note! If the link is longer than a single segment (multiple segments are selected consecutively), it's very important to remember that vehicles need to traverse the whole route to be included in the results.
Keep in mind that it is only possible to select the segments that are located consecutively to the end of the selected route. The available ones are distinguishable by a line of arrows located on them. It is not possible to select routes that are going in multiple directions at the same time.
When defining a link, you are also able to adjust the radius of trips that will be analyzed in the report. The radius ranges from 5 kilometers to 50 kilometers.
Changing the radius value will set the analysis specifications to calculate only the trips within the boundaries of that area. To better understand the size of our radius, please enable the "Show radius" option, which will visualize it on the map.
There is another important value that is shown next to the map version (on the right of it) which is called "Road coverage".
The most important thing to know is that the road coverage is not related to counting trips at all.
The only purpose of road coverage is a reference to calculate the pricing. Road coverage in O/D Analysis is a buffer of roads that we take into consideration depending on the location of your analysis.
For the first 10 km of radius, this value is based on functional road classes from 0 to 5 (major roads).
For Selected Link reports with a radius bigger than 10 km from the link, road coverage value is calculated based on road classes from 0 to 5 (for the first 10 km) and then additionally based on road classes from 0 to 2 (for the area above 10 km).
Example for selected radius of 25 km: We sum up two values of road coverage:
- For the first 10 km based on FRCs 0-5
- The remaining 15 km based on FRCs 0-2 only.
While calculating the road coverage for pricing purposes, we expand the area from the selected link in each direction, so it's just an informative display based on the link you specified, about the price of your analysis, not related to the data of traveling cars.
When all the three steps are completed, the fourth and the last step is the "Summary". This is the final screen before ordering the report. It's a helpful overview of all the analysis specifics that can still be adjusted in case it's necessary.
The analysis will start calculating after pressing the "Order report" button.
Calculations time needed to complete the analysis varies due to different factors such as the date ranges used (how long the analyzed period is), how many time sets were selected and how big the selected link route is.
Usually, it should not take longer than 30-60 minutes to calculate a report but please keep in mind, that in some cases it can take up to a few hours. If your analysis is calculating for more than 24 hours, feel free to reach out to us via e-mail to MoveSupport@tomtom.com and we will be able to see if everything is working properly.
Selected Link Results
Once the analysis is calculated it needs to be confirmed by the user. The confirmation step is showing the number of analyzed trips, so in case the trip count is not satisfactory, we advise rejecting the report, as confirmation is also a commitment to pay for the calculated report.
More information about calculating and accepting reports can be found here:
If the report is accepted, the user is transferred to the results screen. The left panel contains all the information about the report which are: trips analysed, road coverage used (pricing), date ranges, and time ranges (along with the timezone used).
Other than this, it is possible to download the link geometry as a .GeoJSON file or go to view the results.
The results offer two different approaches (directions) users can analyze.
The first one is "outgoing trips" which shows the trips distribution starting from the road segment specified by the user during the analysis creation process.
The second one is "incoming trips" which shows the trips distribution that ends at the road segment specified by the user during the analysis creation process.
Trips are visualized as different routes coloured based on the customizable scale which can be changed by selecting one of the predefined colour templates.
The distribution of trips values is shown in two different ways - percentages and the actual number of trips. It is possible to switch between those two options in the "Filters" section in the upper left corner of the results screen.
Each of the routes visible on the map is made of smaller segments that are clickable. Selecting each segment will show the values of trips that were also observed in the original segment (the start or end point of the report depending on which direction was selected).
In some cases, the tool is showing alternative routes if there are more connections between the original link and the selected segment. Those alternative paths are displayed in the bottom right corner of the screen.
Depending on the use case and to improve the visibility of the results it is possible to change the lower limit of displayed segments. To adjust it, please use the "Min Trips" and "Min Percent" filters.
All the segments that contain a value lower than the selected number in this filter, will disappear from the map, making the results clearer.
Important Note! Keep in mind that the visible segments are based mainly on the FRC 0-6 (functional road classes), so if the trip start or end is located on any road class smaller than FRC 6 (from 7 upwards), that start or end will be trimmed and will not be visible as a clickable road segment in the results. The only exception is when the road class smaller than FRC 6 works as a via point between two other segments.
In the results, the segment needs to have at least 0.1% of all the trips coming from the original link or at least 5 trips in case the value is lower than 0.1%. Otherwise, road segments that have less than 5 trips on them will not be included in the results.
The above restrictions are made due to privacy precautions and vehicle users anonymization.
Downloading The Results
The results of the analysis can be downloaded in three different file formats: