As a GIS practitioner in the Georgetown County, South Carolina, planning office, you've been tasked with helping the city planner prepare data to support the county's upcoming Community Rating System (CRS) review process. The CRS is a voluntary program administered by the Federal Emergency Management Agency (FEMA) that provides flood insurance discounts to communities that act to reduce their flood risk. The planner is specifically interested in finding areas within the regulatory 100-year floodplain that are eligible for Open Space Preservation (OSP) credit (Activity 422a). OSP is often prioritized because it incentivizes nature-based solutions to reduce flood risk while also providing the largest amount of points, which results in lower flood insurance costs. In the past, limited data availability and other resource barriers have hindered the parcel-scale analysis that is required pursuant to the (2017 CRS Coordinator's Manual).
In this lesson, you'll use the OSP Activity 420 for the FEMA CRS layer from ArcGIS Living Atlas of the World to perform an analysis that will identify protected open areas that are eligible for OSP credit. First, you'll connect to Living Atlas in ArcGIS Pro and modify the layer using a raster function. Then, you'll use zonal statistics to calculate areas of eligible open space at a parcel level. Finally, you'll create a custom map and table that detail the spatial information required for the CRS review process.
|Modify a raster image service||Prepare a Living Atlas raster image service through clipping and raster functions.||20 minutes|
|Calculate areas of eligible open space||Use zonal statistics to determine the acreage of eligible open space per parcel.||40 minutes|
|Create a print map||Create and export the map and data table required for the CRS review process.||30 minutes|