#3223 - Missing Maps: Cambodia Malaria Elimination 1

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  • Author: HOT and DigitalGlobe
  • Requesting Org: Clinton Health Access Initiative
  • Map Feature: Buildings Only

This project supports efforts to eliminate malaria and other interventions. Your mapping contribution will help prevent the suffering and loss of life this disease causes!

HOT and DigitalGlobe have teamed up to identify and map populated places in an area of interest covering over 500,000 square kilometers in Southern Africa, Southeast Asia and Central America to support the Clinton Health Access Initiative's malaria program.

This project is to trace buildings in this region of Cambodia. It is very easy for new mappers to contribute to using the iD editor. For JOSM and other editors, see the instructions for retrieving/showing the task shapes. This project was created using Mapswipe to identify the areas where structures exist.

The Missing Maps project aims to map the most vulnerable places in the world (affected by humanitarian crises: disease epidemics, conflict, natural disasters, poverty, environmental crises). Building on HOT's disaster preparedness projects, the Missing Maps tasks facilitate pre-emptive mapping of priority countries to better facilitate disaster response, medical activities and resource allocation when crises occur.

Created by russdeffner - Updated - Priority: low


Entities to Map
Changeset Comment
#hotosm-project-3223 #MissingMaps #EliminateMalaria #Cambodia
When saving your work, please leave the default comment but add what you actually mapped, for example "added buildings and a residential road".

Project Specific Mapping Notes

  • Some of these squares may already be partially or fully mapped, please review and map missing features if needed, fix up the existing mapping, or just mark it "Done" if already complete.
  • This project was created using data from a Mapswipe campaign, therefore the task shapes are irregular and task boundaries will not load automatically in JOSM and some other editors. To show the task shapes, you will need to download a GPX file and add it to your editor: Cambodia 1 Task Boundaries.

Imagery Notes

  • Please use the Bing imagery as it was used during the Mapswipe campaign to identify the areas with structures, you are encouraged to compare with DigitalGlobe or Mapbox services as well.
  • View this video demonstration of imagery alignment in iD


  • 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.
  • Most buildings are rectangular, after drawing the outline, use the 's' key in the iD web editor to "square" the corners.
  • For circular buildings there is the 'o' key in the iD editor to create a circular structure.
  • Many buildings are very close, but do not actually touch each other, try to map them close to each other without letting them connect or share nodes with each other, roads or residential area outlines. In the iD web editor, holding down the "alt" key will keep nodes of "snapping" to each other and accidentally connecting.
  • In the iD web editor, the first time you map a building you will use the "Building Features" category and then at the top 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.

If you have personal knowledge of a building, please add that information to the building, like the name or type of building (hospital, school, gas station, etc)

Roads and Other Features

Your are not requested to map anything other than buildings in this project, however if you choose to, please consult the broader OSM Wiki for mapping and tagging guidance.

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Contributors Done Assigned