<p>The USACE SACS Population and Infrastructure Exposure Index
combines the normalized score of each Infrastructure and Population Index, and
then re-normalizes these values across the study area. </p>

<p>The SACS Infrastructure Exposure Index was created by
spatially joining 52 infrastructure datasets from DHS’s HIFLD database and Military
Installation Ranges and Training Areas from the DOD OSD to census tracts across
the study area. The infrastructure elements were assigned a weighting value
consistent with the NACCS Tier 1 Methodology (URL). The weighted infrastructure
element values were then aggregated by count within each census tract, and then
divided by the census tract area to generate an infrastructure density value.
This infrastructure density value was then enumerated and ranked across all
census tracts, and normalized to 0 to 1 using these rankings. The census tract
feature dataset was then converted to a grid using these normalized values for
aggregation with other SACS datasets.</p>

<p>The SACS Population Exposure Index depicts the 2015 Census –
American Community Survey data as population density. This population density
is calculated as persons per square mile, per census tract. The census tracts
depicted are within the USACE South Atlantic Coastal Study boundaries with an
inland extent of NOAA’s Category 5 Maximum of Maximum Storm Surge Hazard Layer.
The index ranks all census tracts within the SACS study area on a percentile
index by population density. These data are represented on a normalized scale
of 0 to 1, with 1 being the most densely populated census tract in the study
area, and zero being the least densely populated census tract. The census tract
feature dataset was then converted to a grid using these normalized values for
aggregation with other SACS datasets.</p>

<p>References:<br />
DHS HIFLD<br />
<a href='https://gii.dhs.gov/hifld/' rel='nofollow ugc'>https://gii.dhs.gov/hifld/</a></p>

<p>DOD OSD<br />
<a href='https://www.acq.osd.mil/dodsc/fast41_gisdatasets.html' rel='nofollow ugc'>https://www.acq.osd.mil/dodsc/fast41_gisdatasets.html</a></p>

<p>US Census<br />
<a href='https://www.census.gov/' rel='nofollow ugc'>https://www.census.gov/</a> </p>

<p>NACCS (appendix C, page 107)<br />
<a href='https://www.nad.usace.army.mil/Portals/40/docs/NACCS/NACCS_Appendix_C.pdf' rel='nofollow ugc'>https://www.nad.usace.army.mil/Portals/40/docs/NACCS/NACCS_Appendix_C.pdf</a></p>
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