Best Emergency Shelter Locations on San Andrés Island in the Event

of a Catastrophic StormArielle Parnes-Katz, Clayton Sodergren, Chippie Kislik Client: Governor

Pedro Gallardo Forbes San Andrés,Colombia

The 90-meter SRTM DEM, which is the best available elevation data for the island, did not have accurate values for the shoreline, and often did not have ‘0’ values. To correct this, we had to do extra processing (Fig. 4). Another limitation we encountered was the general lack of data available for the island, which restricted our opportunities and constraints layers. The parameters we used for our suitability analysis excluded some areas of the island, making the �inal suitability map appear to have areas without data (Fig. 3).

₊ ₌

Landmarks

Freshwater Lakes

Wells & Native Lodges

Sea Level

Roads

5-Meter Inundation on San Andrés

Figure 1: Total Constraints Figure 2: Total Opportunities Figure 3: Final Suitability

Figure 4: Raster Processing

Figure 5: Constraint Processing

Figure 6: Opportunity Processing

Climate change is resulting in more devastating tropical storms. In the event of a catastrophic storm hitting the island of San Andrés, the local authorities should be informed of the safest areas to locate an emergency shelter.

Problem

Constraints

Methods

Sources

Limitations

1. Raster Surface Modeling2. Site Suitability Analysis

!"#"$%#& '()*+%& '+",%&-&.%$(,)#/(0&

1"#/2%&3*(4%+#/(0&

50",6$/$&3*(4%+#/(0&

DEM from SRTM CGIAR Consortium for Spatial Info

90 meter GSC WGS 1984 UTM Zone 17N

Freshwater Lakes Open Street Map 1:10,000 GSC WGS 1984 UTM Zone 17N

Landmarks (large facilities)

Open Street Map 1:10,000 GSC WGS 1984

UTM Zone 17N

Roads CORALINA 1:10,000 GSC WGS 1984

UTM Zone 17N

Native Lodges CORALINA 1:10,000 GSC WGS 1984

UTM Zone 17N

Wells CORALINA 1:10,000 GSC WGS 1984

UTM Zone 17N

Island Basemap CORALINA 1:10,000 GSC WGS 1984

UTM Zone 17N

Neighborhoods CORALINA 1:10,000 GSC WGS 1984

UTM Zone 17N

Over 11.5% slope5-meter Storm Surge

Over 300 meters from a neighborhoodWest & Southwest Aspects

100 m

300m

300 m

1500 m

1000 m

Opportunities

Conclusions

Proximity to roads Proximity to Native Lodge

Proximity to Multiple wells Proximity to freshwater sources

Proximity to large facility for shelterOver 15 meter elevation

We found a centrally located area of highest suitability that contains an easily accessible facility: the First Baptist Church, which is a common gathering place for the local community.