Geodata of Update 6: Reduction of Somali IDP Shelter Concentrations in Mogadishu, Somalia (3 June 2013 - 24 November 2013)
Summary: A total of 324 spatially distinct IDP shelter concentrations were identified as of 24 November 2013 within Mogadishu, representing a decrease of 56 IDP sites since the last UNOSAT analysis which used an image from 13 June 2013. An estimate of the total number of IDP structures located in Mogadishu indicates a minimum figure of at least 55,000 mostly informal shelters. The number of IDP camps has significantly reduced in multiple areas of Mogadishu. This report is the sixth in a series of IDP analyses done by UNOSAT since 2011 and is based on a time-series analysis of shelter concentrations within the city of Mogadishu using multiple satellite images acquired between 30 March 2011 and 24 November 2013. This assessment has not yet been validated in the field. Please send feedback to UNITAR/UNOSAT.
This dataset updates: Never
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UNOSAT datasets and maps are produced using a variety of methods. In general, analysts closely review satellite imagery, often comparing two or more images together, and determine notable changes between the images. For damage assessments, refugee or IDP assessments, and similar analyses, these changes are then manually documented in the vector data by the analyst. For flood extractions, landcover mapping and similar analyses, a variety of automated remote sensing techniques are used to extract the relevant information which is then reviewed and revised as necessary by the analyst. In all cases, resulting data is then loaded into a standardized UNOSAT geodatabase and exported asshapefiles for dissemination.
Caveats / Comments
This is a preliminary assessment and has not yet been validated in the field. It is important to consider the characteristics of the source imagery used in the analyses when interpreting results. For damage assessments it should be noted that only significant damage to the structural integrity of the buildings analyzed can be seen in imagery, while minor damage such as cracks or holes may not be visible at all. For flood extractions using radar data it is important to note that urban areas and highly vegetated areas may mask the flood signature and result in underestimation of flood waters. Users with specific questions or concerns should contact email@example.com to seek clarification.