#611 - Gaza-Strip-2014

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For coordinating future interventions and humanitarian assistances, the Middle East & Near Africa Shelter Cluster in partnership with Terre des Hommes, decided to launch the digitalization of Gaza buildings, in close relation with OpenStreetMap contributors, based on an imagery of the July 6, 2014.

The results will be essential to fine tune existing UNOSAT damage assessment and to provide to the humanitarian community a precise baseline for analysis related to destruction and population displaced.

The baseline will be completed later on with more exhaustive damage assessment and results will be available for GIS expert and the humanitarian organization providing gaza field assistance.

A high-resolution Pléiades satellite imagery of Gaza, taken on July 6th, 2014, will be used with a license that allows its use for tracing in OSM. It has been made available on OpenStreetMap France server.

What to do

Digitizing the pre-crisis buildings in OSM

We do not need to digitize the greenhouses

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Created by fmoine - Updated - Priority: urgent

  Instructions

Changeset Comment
Changeset : Gaza Strip, #hotosm-task-611 Source= Pleiades 20140706, CNES, Airbus Defense and Space
When saving your work, please leave the default comment but add what you actually mapped, for example "added buildings and a residential road".
Imagery

[imagery url available only after accepting the license]

Access to this imagery is limited by the Airbus DS / OSM-FR license agreement.

You need to review and acknowledge the agreement.


Digitizing the pre-crisis buildings in OSM

We do not need to digitize the greenhouses

During digitalization, it is important that each buildings are separated from each other Wiki Coordination Page

For Digitizing the pre-crisis buildings in OSM (Gaza Strip case), we recommend to install and use the Building plugin in JOSM. A LearnOSM tutorial describes in detail the use of this Plugin.

Note that the imagery is oblique and that in urban areas the multi-floors buildings look larger that they are in reality. When tracing, you have to take this into account. You must place the polygon that represent the building at the building footprint (see the wiki).

In this same oblique image, the building looks like it's footprint goes up to he middle of the road. In fact it is not and you must correct taking into account this perspective effect.

To assure that you respect the proportions and locate properly the building :

Simply trace the contour of the roof using the Building plugin Since roof and basis of a building have generally the same proportions, you now have the good proportions.


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