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How to fix merger problems (problems 50-60) - (Obsolete)

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Revision as of 13:03, 7 January 2010 by Shirlig (Talk | contribs)

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Most of the map updates are done automatically by the program itself. This is done by matching the users driving sessions to the existing road map and updating the map (shape of the road or direction for example) according to the GPS tracks of anonymous users. Merger problems are problems arising from a discrepancy between the data gathered from the driving sessions and the existing map. For example, when there is deviation between the GPS tracks and and the road as it is currently mapped, merger problem will appear at relevant points on the map.

Merger problems require deep examination of both the map and the driving session that created the problem.
The driving session should be examined carefully, even beyond the specific point of the problem – in order to fully understand what made the problem appear. At a first glance it will often seems that there is no problem but a deeper investigation will of the whole area in the map will eventually allow to find the source of the problem away from the position of the appearance of the problem.

It is important to note that merger problems are not always problems resulting from an inaccurate map, but many times the error is caused from deviations, disturbances and errors of the GPS component in the phone.
It is necessary to diagnose the problem well before deciding if the off track GPS points are due to deviations from the roads on the map or from an inaccurate GPS reading of the phone. Clicking the problem will show the relevant points from the session that caused the problem. The relevant details will appear in the edit panel with helpful tools to resolve it. In addition, two specific road segments will be highlighted in yellow on the map: Previous segment and Next segment.
These two segments are actually the segments which the system could not connect and match to the GPS track, for some reason. The type of the problem which appears on the map will be described in the edit panel after the specific problem has been chosen. There are several solutions for each problem, depending on the data from the map and from the session.

Tools to resolve Merger problems:

  1. View relevant session (in the edit panel) – Choosing this option will show on the map the relevant driving session which caused the anomaly. Viewing the relevant session is a primary and necessary tool to fully understand the origin of the problem and to resolve it. Note that the driving session appears as GPS points on the map. In order to see the GPS points it is sometimes necessary to zoom in on the map (the points only appear from a certain zoom level).
  2. View archived routes (in the edit panel) – Choosing this option will create a list which includes all of your driving sessions in the problem's area. In case you didn't drive in this area, the View archived routes won't show any results.
  3. GPS points (in the view panel) – In order to view the GPS points on the map, you need to activate the 'GPS points' layer. After this layer is activated, different view options will appear in the bottom of the edit panel.
    It is recommended to click on the Display as arrows check box in order to view the GPS points with their driving directions.
  • Color tracks - The GPS points will appear in different colors for each user's track.

Merger color tracks edited.png

  • Color by azimuth - The GPS points will appear in different colors for different azimuths.

Merger color by azimuth edited.png

  • Marked session- will show the specific driving session as red arrows. In other cases, after clicking on a merger problem, the driving session that caused the anomaly will appear as red arrows as well.

Merger marked session edited.png

After the problem has been checked with the relevant tools and in case the conclusion is that the problem does not result from the map but from a GPS deviation, it is necessary to update it as explained below:

  1. Make sure that the problem doesn't require a correction.
  2. Select the problem, its details will appear in the edit panel.
  3. I the bottom of the edit panel will appear the word resolve with options to resolve the problem.
  4. From the given options, select Not a problem and confirm.