#583 - Ebola Outbreak, Kenema, Segbwema (Sierra Leone) -- Updated Imagery, 2014-07-12 (Archived)

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This project was archived.

  • Author: HOT
  • Requesting org.: IFRC / Red Cross
  • Priority: High

The International Federation of Red Cross and Red Crescent Societies (IFRC) is deploying for the Ebola epidemic going on there. More detailed basemap data (roads, villages, streets, buildings) is needed to assist in the response.

Justification There is a resurgence of the Ebola outbreak, and a risk of the epidemy spreading with the multiplication of sites of infection. There are difficulties, including in forests of Sierra Leone with tracing the point of contact and delivering the message to the population about the infection. Both the Red Cross (redcross) and MSF (MSF) are deploying in Sierra Leone where various sites have been identified.

MapGive Through the MapGive project, the Humanitarian Information Unit (HIU) of the U.S. Department of State is providing the OpenStreetMap community access to updated satellite imagery services to help assist with humanitarian mapping.

Created by AndrewBuck - Updated - Priority: low


Changeset Comment
Sierra Leone, #hotosm-ebola-sl-583, #MapGive ; source=WorldView-2, DigitalGlobe, NextView, 23 March 2014 and March 2013
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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2014 West Africa Ebola Response
Wiki Coordination Page

Please map in detail. Trace all the buildings you can see. This is essential information for the Red Cross. In some densely populated areas you may not be able to trace all the buildings, just do the best you can.

Note: Varying issues in alignment can occur in various sections where the new provided imagery overlaps with the older Bing imagery. This affects when imagery should be shifted or not.

Underlying high-resolution Bing imagery exists in the northern part of the Eastern imagery strip where Segbwema and Daru are located. There are numerous OSM features that have already been created in these cities. If you are updating this area with the newer provided imagery you must shift the imagery to align with the existing OSM features.

How to shift imagery in ID editor: In right-hand menu click on ‘Background settings’, then click on ‘Fix alignment’. You can then click on the arrow buttons to shift the imagery.

The rest of the imagery only had low resolution Bing imagery coverage. For these areas no shifting is needed. Create new features aligned on top of the newly provided imagery!

Trace also the roads, tag them according to the Highway Tag Africa wiki page. Note that for some areas, clouds will obscure the view. In these areas, do your best. We will revise the mapping of these areas when new imagery is available.

Save with credit to HotOSM and MapGive. Comment the changeset with: Sierra Leone, #hotosm-ebola-sl-583, #MapGive

And use the following source tag either on the objects you create or on the changeset itself (if using JOSM): source=WorldView-2, DigitalGlobe, NextView, 23 March 2014 and March 2013

Imagery Details

This imagery is from Digital Globe’s WorldView-2 satellite taken on from multiple images acquired in March 2013 and March 2014. The image is almost 20GB in size and has been pan-sharpened (combined panchromatic and multispectral images) for visual clarity and orthorectified for terrain corrected geographic precision. Additionally, the image has been contrast stretched using a custom stretch and processed into a Tiled Map Service (TMS) for performance.

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