#1920 - Sri Lanka Floods: Aranayake Landslide Area (Archived)

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This project was archived.

This project went through two rounds, once using the default imagery and then a second time with imagery from HIU to capture new construction and better accuracy of building footprints and precision of object position.

The Disaster Management Centre of Sri Lanka has asked HOT to map the Aranayake area as it was before a major landslide hit the area after heavy rains. This will help with damage estimation and aid delivery to the survivors of the landslide.

Created by Rbanick - Updated - Priority: low


Entities to Map
buildings, roads, paths
Changeset Comment
#hotosm-project-1920 #Sri-Lanka-Floods #opendri #opencities
When saving your work, please leave the default comment but add what you actually mapped, for example "added buildings and a residential road".

[imagery url available only after accepting the license]

Access to this imagery is limited by the NextView license agreement.

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Project specific guidance

  • Please map all the visible buildings you can using the newly provided imagery (it should load automatically). If you have any problems with the imagery switch to bing for reference.

  • Be careful not to upset the existing road relationships as the OSM-LK community has invested a lot of time and effort making the road routing work successfully in GPS devices.


  • Please accurately outline all the buildings you can find. The outline should be for the full size of the building even if it is partly covered by trees in the imagery.
  • It is ok to "split" task squares - Sometimes a task square will have a lot detailed settlement mapping. If you think it would help to make the task square smaller so the mapping could be finished in a more reasonable time, use the "split" link above the task square comment box.

  • After drawing the outline, use the 's' key in the web editor to "square" the corners.

  • In the iD web editor, the first time you map a building you will use the "Building" category and then at the bottom of the list select "Building" again, this is the most generic building tag we can use as we almost never can tell the more specific use of any building from imagery alone.

General mapping guidance

  • Invalidated task squares - You might get a notice that a task square was "invalidated" that almost always just means someone found a few more things to map and they did not have time to map them in. No worries, it is part of the process and happens all the time. If you have to stop mapping before you have mapped everything use the "Unlock" link instead of "Done" As long as you are trying to map everything in a task square you feel confident mapping before you mark one "Done" then all is good.
  • Ask questions - if you have questions, please ask. The front page of this HOT Tasking Manager website offers a few ways to ask or if you are at a mapping event, raise your hand and ask.
  • You are making a real difference mapping - Every contribution matters in a real, tangible way. Mapping is not easy but know that your mapping is used by the Disaster Management Centre of Sri Lanka in near real time.


See Sri Lanka Tagging Guidelines for local mapping guidance.

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