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hot-validation-road-network.md

Nepal HOT Validation: Road Network for Routing

High quality maps is critical to field work. Experienced mappers may validate existing data to fix serious errors and invalidate an area for further work.

Task Briefing

Review the work of existing mappers using the HOT Task Manager. Our priority is routing and we will focus on Road network tasks 1,2,3,6. Pick and unreviewed area and throughly examine the area for the following issues:

Incomplete Task If there are numeruous roads missing and requires a lot more work to improve the quality, /invalidate this task/ so that others can continue to improve it. Add a comment clearly describing the reason for invalidating. Get @geohacker or @planemad to look before you mark it invalid.

Isolated Segments Short segments of isolated roads or paths need to be connected to the nearest road network. Try identify missing portions in the imagery and trace them. If unsure add a FIXME=approximate alignment, needs verification tag

JOSM Validation Run the validator ⇧+v and clear the following issues:

  • Fix all errors
  • Node end near highway
  • Overlapping ways
  • Untagged ways
  • Self intersecting ways
  • Incomplete Object
  • Overlapping buildings

Inconsistent Tagging

  • Mountain trails not fit for road traffic need to be tagged as highway=path and NOT highway=pedestrian or highway=road
  • Connecting roads between habitations are usually highway=unclassified and NOT highway=track. If the road is not topped or looks like it is under construction use the temporary highway=road tag instead

Dos

  • Create a new changeset for every activity: Tracing, Realigning, Fixing: unconnected, duplicates, overlapping; Tagging: adding, correcting
  • Descriptive changesets, for better conflict resolution and review. "Fixed all unconnected segments", "Fixed all overlapping ways", "Added bridge segments", "Remove duplicate ways"
  • Frequent uploads, to avoid conflicts

Validating a Task

Only validate tasks that you are confident has met the task instructions and are free of validation issues. Make sure you add a comment confirming the road network is complete and there are no validation issues. Get @geohacker or @planemad to look before you mark it valid.

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