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Find loose ends

Quality checks and imagery

There exist multiple quality check tools which detect suspicious data such as unconnected highways. One example is osmose for which this server is doing the heavy lifting on the back-end side for all South-East-Asia analysis.

A huge drawback of these tools is that you often need imagery to fix the issues. For example to continue a major highway which just ends you need imagery or GPS tracks to be able to complete the highway. But the QA tools show all issues without considering whether there is imagery or not.

This was the reason I created a site which only displays the problematic ways for which there is imagery available.

What is displayed?

This map displays major highway ends which are not connected to any other road. This is almost always an error. In reality there are smaller roads leading to a highway. The map is filtered so that only these positions are highlighted for which there is Bing imagery available.

The map shows a yellow circle at the node which is not connected. If there are multiple nodes in close proximity they are clustered together and a number shows how many of them had been clustered.

The map displays areas with Bing imagery available in green. As Bing imagery is extended from time to time it might happen that a road which ended previously at an imagery boundary can now be continued. Also "nearly connects" of major highways are visible.

map showing loose ends

Editing the data

Please use the RemoteControl buttons on the left to load the area of your choice in the editor. Best is to zoom in all the way so the area loaded is not too large. My suggestion is to use JOSM to edit. If you prefer potlatch or iD please use the dedicated links on the left. In case RemoteControl is not working in JOSM check the settings. Click on the greyed-out icon to re-check.

RemoteControl tab

In the editor it's easy to continue the highway to resolve the loose end. way just ends

Another solution for problematic cases

It could happen that there are loose ends but when you check the imagery you discover that it has clouds hiding the road so you can't trace it.

loose ends
highway covered

Don't worry! There is still the chance to be able to complete the road, even without having GPS tracks. Due to the generous offer from Mapbox we have an additional imagery source at hand. Switch to Mapbox imagery to see whether it has better suited imagery available. Often this allows to complete the roads.

alternative imagery

Things to consider

There are a few things to consider when using this tool.

Please pay attention to a possible offset in aerial imagery. Best is to check for existing GPS tracks to align the imagery.

Bing imagery boundaries vanish on zoom 11 and higher. This is probably an OpenLayers problem.

It could happen that a way just ends before the boundary. I take some buffer into account but it might happen that it ends just inside the imagery area.

way ends just inside

In this case check whether alternative imagery provider like Mapbox help to continue the highway.

Overview

Return to the Overview page to find more tools.


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