Urban Poverty & Climate Change in Dar es Salaam, Tanzania:
Urban Poverty & Climate Change in Dar es Salaam, Tanzania:
Urban Poverty & Climate Change in Dar es Salaam, Tanzania:
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Estimat<strong>es</strong> of Population and Asset Exposure<br />
126<br />
Annex 4a<br />
The sea-level rise scenarios considered are coupled with the A1 socio-economic (with rapid<br />
urbanisation) scenarios for <strong>es</strong>timat<strong>in</strong>g the future projected population and asset exposure. This<br />
follows the methodology used by Hanson et al. (2009). The simulations to <strong>es</strong>timate exposed<br />
number of people and associated economic assets that are located below the 1 <strong>in</strong> 100 year return<br />
period extreme water levels for each scenarios are performed based on a population distribution data<br />
available from the International Liv<strong>es</strong>tock R<strong>es</strong>earch Institute (ILRI) GIS-compatible onl<strong>in</strong>e spatial<br />
data layers [http://www.ilri.org/GIS] (see Table 1 and Figure 5) and a Shuttle Radar Topography<br />
Mission (SRTM) elevation data of approximately 90m r<strong>es</strong>olution obta<strong>in</strong>ed from the U.S. Geological<br />
Survey (USGS) server http://www.usgs.gov]. The population by elevation on a horizontal map of<br />
geographical cells is then <strong>es</strong>timated by mapp<strong>in</strong>g the population distribution over the wards of each<br />
district onto the SRTM, which allows the total population distribution aga<strong>in</strong>st elevation to be<br />
<strong>es</strong>timated. In quantify<strong>in</strong>g the <strong>in</strong>frastructure assets exposed to the 1 <strong>in</strong> 100 year extreme water<br />
levels, a method commonly used <strong>in</strong> the <strong>in</strong>surance <strong>in</strong>dustry and applied by Nicholls et al. (2008) is<br />
adopted which <strong>es</strong>timat<strong>es</strong> the value of assets us<strong>in</strong>g the population exposed (Equation 2).<br />
Ea = Ep x GDPpercapita (PPP) x 5 ………………..……………………...............………………………. (2)<br />
Where, Ea is exposed asset (monetary value), Ep is exposed population, and GDPpercapita (PPP) is the<br />
national per capita Gross Dom<strong>es</strong>tic Product (GDP) Purchas<strong>in</strong>g Power Parity (PPP).<br />
Source: Excerpted from Kebede and Nicholls (2010)